| **Consolidated Statement of Equity (Statement) - USD ($) $ in Thousands**                                  | Total       | Parent [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] |
|------------------------------------------------------------------------------------------------------------|-------------|-----------------|-----------------------|-------------------------------------|----------------------------|-------------------------|
| **Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]**             |        |            |                  |                                |                       |                    |
| Shares, Issued                                                                                             |        |            | 65,955,080            |                                |                       | (55,927)                |
| Issuance of stock awards, net of forfeitures                                                               |        |            | 177,945               |                                |                       |                    |
| **Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]**                             |        |            |                  |                                |                       |                    |
| Purchase of treasury shares                                                                                |        |            |                  |                                |                       | (87,063)                |
| Issuance of treasury shares                                                                                |        |            | 0                     |                                |                       | 78,395                  |
| Non-employee directors' deferred compensation plan                                                         |        |            |                  |                                |                       | (2,574)                 |
| Stockholders' Equity Beginning, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2017 |        | $ 2,507,649     | $ 659                 | $ 2,503,294                         | $ 6,704                    | $ (3,008)               |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                             |        |            |                  |                                |                       |                    |
| Purchase of treasury shares                                                                                | $ (4,494)   | (4,494)         |                  |                                |                       | (4,494)                 |
| Issuance of stock awards, net of forfeitures                                                               |        | 0               | 2                     | (2)                                 |                       |                    |
| Share-based Compensation expense                                                                           | 10,779      | 10,779          |                  | 10,779                              |                       |                    |
| Issuance of treasury shares                                                                                |        | 0               | 0                     | (4,288)                             |                       | 4,288                   |
| Non-employee directors' deferred compensation plan                                                         |        | (142)           |                  | 0                                   |                       | (142)                   |
| Net income (loss)                                                                                          | $ (173,396) | (173,396)       |                  |                                | (173,396)                  |                    |
| Stockholders' Equity, Other                                                                                |        | (90)            |                  | (90)                                |                       |                    |
| Stockholders' Equity Ending, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2018    |        | $ 2,340,306     | $ 661                 | $ 2,509,693                         | $ (166,692)                | $ (3,356)               |
| **Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]**             |        |            |                  |                                |                       |                    |
| Shares, Issued                                                                                             |        |            | 66,133,025            |                                |                       | (67,169)                |

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| - Definition
Deferred Compensation Plan, Value, Purchase or Distribution of Shares.
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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.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
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| - Definition
Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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| - Definition
Number of treasury shares (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
Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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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
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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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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| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
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