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Guarantor Subsidiaries (Consolidating Statement Of Changes In Equity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 792,290 | $ 858,705
Issuance of common stock |  |  | 0 | 0
Repurchase of common stock |  |  | (212,328) | (248,695)
Amounts related to share-based compensation |  |  | (5,395) | (3,035)
Share-based compensation expense |  |  | 6,945 | 6,811
Net income attributable to common stockholders | $ 45,491 | $ 60,531 | 177,675 | 109,654
Ending balance | 759,187 | 723,440 | 759,187 | 723,440
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 468 | 468
Issuance of common stock |  |  | 0 | 0
Ending balance | 468 | 468 | 468 | 468
Treasury Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (294,139) | (51,073)
Issuance of common stock |  |  | 9,356 | 5,562
Repurchase of common stock |  |  | (212,328) | (248,695)
Ending balance | (497,111) | (294,206) | (497,111) | (294,206)
APIC |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 558,182 | 557,871
Issuance of common stock |  |  | (9,356) | (5,562)
Amounts related to share-based compensation |  |  | (5,395) | (3,035)
Share-based compensation expense |  |  | 6,945 | 6,811
Ending balance | 550,376 | 556,085 | 550,376 | 556,085
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 527,779 | 351,439
Net income attributable to common stockholders |  |  | 177,675 | 109,654
Ending balance | 705,454 | 461,093 | 705,454 | 461,093
Eliminations |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (1,901,538) |
Net income attributable to common stockholders | (45,491) | (61,041) | (177,674) | (110,949)
Ending balance | (2,079,212) |  | (2,079,212) |
Eliminations | Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (61) | (61)
Ending balance | (61) | (61) | (61) | (61)
Eliminations | APIC |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (1,368,384) | (1,316,516)
Ending balance | (1,368,384) | (1,316,516) | (1,368,384) | (1,316,516)
Eliminations | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (533,093) | (440,963)
Net income attributable to common stockholders |  |  | (177,674) | (110,949)
Ending balance | (710,767) | (551,912) | (710,767) | (551,912)
Parent Company |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 1,456,573 |
Net income attributable to common stockholders | 45,491 | 60,531 | 177,675 | 109,654
Ending balance | 1,421,920 |  | 1,421,920 |
Parent Company | Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 468 | 468
Ending balance | 468 | 468 | 468 | 468
Parent Company | Treasury Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (294,139) | (51,073)
Issuance of common stock |  |  | 9,356 | 5,562
Repurchase of common stock |  |  | (212,328) | (248,695)
Ending balance | (497,111) | (294,206) | (497,111) | (294,206)
Parent Company | APIC |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 1,222,465 | 1,228,095
Issuance of common stock |  |  | (9,356) | (5,562)
Ending balance | 1,213,109 | 1,222,533 | 1,213,109 | 1,222,533
Parent Company | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 527,779 | 351,439
Net income attributable to common stockholders |  |  | 177,675 | 109,654
Ending balance | 705,454 | 461,093 | 705,454 | 461,093
Issuer |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 1,030,855 |
Net income attributable to common stockholders | 45,491 | 60,531 | 177,675 | 109,654
Ending balance | 1,210,080 |  | 1,210,080 |
Issuer | Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 1 | 1
Ending balance | 1 | 1 | 1 | 1
Issuer | APIC |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 564,554 | 558,611
Amounts related to share-based compensation |  |  | (5,395) | (3,035)
Share-based compensation expense |  |  | 6,945 | 6,811
Ending balance | 566,104 | 562,387 | 566,104 | 562,387
Issuer | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 466,300 | 351,439
Net income attributable to common stockholders |  |  | 177,675 | 109,654
Ending balance | 643,975 | 461,093 | 643,975 | 461,093
Guarantor Subsidiaries |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 52,062 |
Net income attributable to common stockholders | 0 | 0 | (1) | (1)
Ending balance | 52,061 |  | 52,061 |
Guarantor Subsidiaries | Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 60 | 60
Ending balance | 60 | 60 | 60 | 60
Guarantor Subsidiaries | APIC |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 52,004 | 52,004
Ending balance | 52,004 | 52,004 | 52,004 | 52,004
Guarantor Subsidiaries | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | (2) | (1)
Net income attributable to common stockholders |  |  | (1) | (1)
Ending balance | (3) | (2) | (3) | (2)
Non-Guarantor Subsidiaries |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 154,338 |
Net income attributable to common stockholders | 0 | 510 | 0 | 1,296
Ending balance | 154,338 |  | 154,338 |
Non-Guarantor Subsidiaries | APIC |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 87,543 | 35,677
Ending balance | 87,543 | 35,677 | 87,543 | 35,677
Non-Guarantor Subsidiaries | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 66,795 | 89,525
Net income attributable to common stockholders |  |  | 0 | 1,296
Ending balance | $ 66,795 | $ 90,821 | $ 66,795 | $ 90,821

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