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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