| **CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)In Thousands** | Total     | Common Stock - Class A [Member] | Common Stock - Class B [Member] | Class A and B Shares held in Treasury [Member] | Paid-in Capital [Member] | Retained Earnings [Member] | Noncontrolling Interest [Member] |
|-------------------------------------------------------------------------|-----------|---------------------------------|---------------------------------|------------------------------------------------|--------------------------|----------------------------|----------------------------------|
| Beginning balances, total stockholders' equity at Dec. 31, 2009         | $ 265,255 | $ 150,911                       | $ 2,684                         | $ (2,339)                                      | $ 30,410                 | $ 83,589                   | $ 0                              |
| Net income                                                              | 8,610     |                            |                            |                                           |                     | 8,610                      |                             |
| Common stock repurchases and retirements                                | (80,807)  | (80,901)                        |                            | 94                                             |                     |                       |                             |
| Share-based compensation expense                                        | 5,385     |                            |                            |                                           | 5,385                    |                       |                             |
| Shares issued under stock option plan                                   | 659       | 659                             |                            |                                           |                     |                       |                             |
| Issuance of restricted stock awards                                     | 0         | (1,280)                         |                            |                                           | 1,280                    |                       |                             |
| Other                                                                   | (3)       | 7                               | (7)                             | (4)                                            |                     | 1                          |                             |
| Ending balances, total stockholders' equity at Dec. 31, 2010            | 199,099   | 69,396                          | 2,677                           | (2,249)                                        | 37,075                   | 92,200                     | 0                                |
| Net income                                                              | 5,486     |                            |                            |                                           |                     | 5,724                      | (238)                            |
| Common stock repurchases and retirements                                | (55,661)  | (55,685)                        |                            | 24                                             |                     |                       |                             |
| Share-based compensation expense                                        | 7,243     |                            |                            |                                           | 7,243                    |                       |                             |
| Shares issued under stock option plan                                   | 947       | 947                             |                            |                                           |                     |                       |                             |
| Issuance of restricted stock awards                                     | 0         | 11,523                          |                            |                                           | (11,523)                 |                       |                             |
| Investment by non-controlling interest                                  | 16,546    |                            |                            |                                           |                     |                       | 16,546                           |
| Other                                                                   | (13)      | (2)                             | 2                               | 0                                              |                     | (13)                       |                             |
| Ending balances, total stockholders' equity at Dec. 31, 2011            | 173,647   | 26,179                          | 2,679                           | (2,225)                                        | 32,795                   | 97,911                     | 16,308                           |
| Net income                                                              | 9,162     |                            |                            |                                           |                     | 9,673                      | (511)                            |
| Common stock repurchases and retirements                                | (17,611)  | (17,701)                        |                            | 90                                             |                     |                       |                             |
| Share-based compensation expense                                        | 5,072     |                            |                            |                                           | 5,072                    |                       |                             |
| Shares issued under stock option plan                                   | 2,118     | 2,118                           |                            |                                           |                     |                       |                             |
| Issuance of restricted stock awards                                     | 0         | 12,104                          |                            |                                           | (12,104)                 |                       |                             |
| Issuance of treasury shares related to deferred compensation payment    | 580       |                            |                            | 511                                            | 69                       |                       |                             |
| Investment by non-controlling interest                                  | 16,461    |                            |                            |                                           |                     |                       | 16,461                           |
| Other                                                                   | 7         | 3                               | (3)                             | 7                                              |                     |                       |                             |
| Ending balances, total stockholders' equity at Dec. 31, 2012            | $ 189,436 | $ 22,703                        | $ 2,676                         | $ (1,617)                                      | $ 25,832                 | $ 107,584                  | $ 32,258                         |

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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
Represents an increase in noncontrolling interest from issuance of additional equity interests to noncontrolling interest holders or the sale of a portion of the parent's controlling interest.
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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
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.
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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.
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No definition available.
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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.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.
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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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