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Guarantor Subsidiaries (Consolidating Statement Of Changes In Equity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 792,290 $ 858,705
Repurchase of common stock     (167,105) (189,834)
Amounts related to share-based compensation     (4,237) (3,030)
Share-based compensation expense     4,780 4,353
Net income attributable to common stockholders $ 46,310 $ 26,191 132,184 49,123
Ending balance 757,912 719,317 757,912 719,317
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     6,748 5,517
Repurchase of common stock     (167,105) (189,834)
Ending balance (454,496) (235,390) (454,496) (235,390)
APIC        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     558,182 557,871
Issuance of common stock     (6,748) (5,517)
Amounts related to share-based compensation     (4,237) (3,030)
Share-based compensation expense     4,780 4,353
Ending balance 551,977 553,677 551,977 553,677
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     527,779 351,439
Net income attributable to common stockholders     132,184 49,123
Ending balance 659,963 400,562 659,963 400,562
Eliminations        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     (1,901,538)  
Net income attributable to common stockholders (46,310) (27,562) (132,183) (49,908)
Ending balance (2,033,721)   (2,033,721)  
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     (132,183) (49,908)
Ending balance (665,276) (490,871) (665,276) (490,871)
Parent Company        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     1,456,573  
Net income attributable to common stockholders 46,310 26,191 132,184 49,123
Ending balance 1,421,653   1,421,653  
Parent Company | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     468 468
Issuance of common stock       0
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     6,748 5,517
Repurchase of common stock     (167,105) (189,834)
Ending balance (454,496) (235,390) (454,496) (235,390)
Parent Company | APIC        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     1,222,465 1,228,095
Issuance of common stock     (6,748) (5,517)
Ending balance 1,215,717 1,222,578 1,215,717 1,222,578
Parent Company | Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     527,779 351,439
Net income attributable to common stockholders     132,184 49,123
Ending balance 659,963 400,562 659,963 400,562
Issuer        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     1,030,855  
Net income attributable to common stockholders 46,310 26,191 132,184 49,123
Ending balance 1,163,581   1,163,581  
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     (4,237) (3,030)
Share-based compensation expense     4,780 4,353
Ending balance 565,097 559,934 565,097 559,934
Issuer | Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     466,300 351,439
Net income attributable to common stockholders     132,184 49,123
Ending balance 598,484 400,562 598,484 400,562
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 1,371 0 786
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     0 786
Ending balance $ 66,795 $ 90,311 $ 66,795 $ 90,311