| **CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands** | Total     | Shares of Class A and B Common Stock [Member] | Class A Shares held in Treasury [Member] | Paid-in Capital [Member] | Retained Earnings [Member] | Non-controlling Interests [Member] | Common Stock - Class A [Member] | Common Stock - Class B [Member] |
|---------------------------------------------------------------------------------------------------|-----------|-----------------------------------------------|------------------------------------------|--------------------------|----------------------------|------------------------------------|---------------------------------|---------------------------------|
| Beginning balances, Common Stock, Shares Issued at Dec. 31, 2014                                  |      | 41,157                                        |                                     |                     |                       |                               |                            |                            |
| Beginning balances, total stockholders' equity at Dec. 31, 2014                                   | $ 467,222 |                                          | $ (249)                                  | $ 26,773                 | $ 124,547                  | $ 299,866                          | $ 13,617                        | $ 2,668                         |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                    |      |                                          |                                     |                     |                       |                               |                            |                            |
| Net income (loss)                                                                                 | (16,987)  |                                          |                                     |                     | (17,265)                   | 278                                |                            |                            |
| Common stock repurchases and retirements, shares                                                  |      | (2,404)                                       |                                     |                     |                       |                               |                            |                            |
| Common stock repurchases and retirements                                                          | (44,324)  |                                          |                                     |                     | (25,262)                   |                               | (19,062)                        |                            |
| Shares issued under stock option plan, shares                                                     |      | 38                                            |                                     |                     |                       |                               |                            |                            |
| Shares issued under stock option plan                                                             | 295       |                                          |                                     |                     |                       |                               | 295                             |                            |
| Issuance of restricted stock awards, shares                                                       |      | 647                                           |                                     |                     |                       |                               |                            |                            |
| Issuance of restricted stock awards                                                               | 0         |                                          |                                     | (5,146)                  |                       |                               | 5,146                           |                            |
| Share-based compensation expense                                                                  | 7,982     |                                          |                                     | 7,982                    |                       |                               |                            |                            |
| Distribution to non-controlling interest                                                          | (765)     |                                          |                                     |                     |                       | (765)                              |                            |                            |
| Investment by non-controlling interest                                                            | 3,209     |                                          |                                     |                     |                       | 3,209                              |                            |                            |
| Non-controlling interest acquisition                                                              | (305,831) |                                          |                                     | (34,310)                 |                       | (271,521)                          |                            |                            |
| Other                                                                                             | (230)     |                                          |                                     | (230)                    |                       |                               | 4                               | (4)                             |
| Ending balances, Common Stock, Shares Issued at Sep. 30, 2015                                     |      | 39,438                                        |                                     |                     |                       |                               |                            |                            |
| Ending balances, total stockholders' equity at Sep. 30, 2015                                      | 110,571   |                                          | (249)                                    | (4,931)                  | 82,020                     | 31,067                             | $ 0                             | $ 2,664                         |
| Beginning balances, Common Stock, Shares Issued at Dec. 31, 2015                                  |      | 38,747                                        |                                     |                     |                       |                               | 35,593                          | 3,154                           |
| Beginning balances, total stockholders' equity at Dec. 31, 2015                                   | 119,261   |                                          | (249)                                    | 6,631                    | 79,217                     | 30,998                             | $ 0                             | $ 2,664                         |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                    |      |                                          |                                     |                     |                       |                               |                            |                            |
| Net income (loss)                                                                                 | 12,107    |                                          |                                     |                     | 12,457                     | (350)                              |                            |                            |
| Common stock repurchases and retirements, shares                                                  |      | (3,027)                                       |                                     |                     |                       |                               |                            |                            |
| Common stock repurchases and retirements                                                          | (47,655)  |                                          |                                     |                     | (47,459)                   |                               | (196)                           |                            |
| Issuance of restricted stock awards, shares                                                       |      | 580                                           |                                     |                     |                       |                               |                            |                            |
| Issuance of restricted stock awards                                                               | 0         |                                          |                                     |                     |                       |                               |                            |                            |
| Share-based compensation expense                                                                  | 7,978     |                                          |                                     | 7,978                    |                       |                               |                            |                            |
| Other, shares                                                                                     |      | 18                                            |                                     |                     |                       |                               |                            |                            |
| Other                                                                                             | 196       |                                          |                                     |                     |                       |                               | $ 196                           |                            |
| Ending balances, Common Stock, Shares Issued at Sep. 30, 2016                                     |      | 36,318                                        |                                     |                     |                       |                               | 33,164                          | 3,154                           |
| Ending balances, total stockholders' equity at Sep. 30, 2016                                      | $ 91,887  |                                          | $ (249)                                  | $ 14,609                 | $ 44,215                   | $ 30,648                           | $ 0                             | $ 2,664                         |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in noncontrolling interest from a business combination.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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| - Definition
Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased and retired during the period.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of increase (decrease) in shares of stock classified as other.
+ References
No definition available.
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