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Guarantor Subsidiaries (Consolidating Statement Of Changes In Equity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       $ 858,705       $ 656,336 $ 858,705 $ 656,336 $ 1,104,451
Repurchase of common stock                 (248,695) (51,348)  
Issuance of common stock                   1  
Amounts related to share-based compensation                 (3,075) (582)  
Share-based compensation expense                 9,015 10,435 2,914
Net income $ 66,700 $ 60,500 $ 26,200 22,900 $ 98,400 $ 62,700 $ 73,200 9,600 176,340 243,863 235,033
Dividend paid to former parent                     (650,000)
Net transfers to/between former parent                     (36,062)
Balance 792,290       858,705       792,290 858,705 656,336
Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       468       467 468 467 0
Issuance of common stock                   1  
Issuance of stock at the separation and distribution                     467
Balance 468       468       468 468 467
Treasury Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (51,073)       0 (51,073) 0 0
Issuance of common stock                 5,629 275  
Repurchase of common stock                 (248,695) (51,348)  
Balance (294,139)       (51,073)       (294,139) (51,073) 0
APIC [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       557,871       548,293 557,871 548,293 0
Issuance of common stock                 (5,629) (275)  
Amounts related to share-based compensation                 (3,075) (582)  
Reclassification of net parent investment to APIC                     545,846
Share-based compensation expense                 9,015 10,435 2,914
Issuance of stock at the separation and distribution                     (467)
Balance 558,182       557,871       558,182 557,871 548,293
Net Parent Investment [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       0       0 0 0 1,104,451
Reclassification of net parent investment to APIC                     (545,846)
Net income                     127,457
Dividend paid to former parent                     (650,000)
Net transfers to/between former parent                     (36,062)
Balance 0       0       0 0 0
Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       351,439       107,576 351,439 107,576 0
Net income                 176,340 243,863 107,576
Balance 527,779       351,439       527,779 351,439 107,576
Eliminations [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (1,757,540)         (1,757,540)    
Net income                 (92,130) (440,963) 0
Balance (1,901,538)       (1,757,540)       (1,901,538) (1,757,540)  
Eliminations [Member] | Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (61)       (61) (61) (61) 0
Issuance of stock at the separation and distribution                     (61)
Balance (61)       (61)       (61) (61) (61)
Eliminations [Member] | APIC [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (1,316,516)       (1,316,516) (1,316,516) (1,316,516) 0
Reclassification of equity                 (51,866)    
Reclassification of net parent investment to APIC                     (1,316,516)
Balance (1,368,382)       (1,316,516)       (1,368,382) (1,316,516) (1,316,516)
Eliminations [Member] | Net Parent Investment [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance               0   0 (190,461)
Reclassification of net parent investment to APIC                     190,461
Balance                     0
Eliminations [Member] | Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (440,963)         (440,963)    
Net income                 (92,130) (440,963)  
Balance (533,093)       (440,963)       (533,093) (440,963)  
Parent Company [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       1,528,929         1,528,929    
Net income                 176,340 351,439 0
Balance 1,456,573       1,528,929       1,456,573 1,528,929  
Parent Company [Member] | Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       468       467 468 467 0
Issuance of common stock                   1  
Issuance of stock at the separation and distribution                     467
Balance 468       468       468 468 467
Parent Company [Member] | Treasury Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (51,073)         (51,073)    
Issuance of common stock                 5,629 275  
Repurchase of common stock                 (248,695) (51,348)  
Balance (294,139)       (51,073)       (294,139) (51,073)  
Parent Company [Member] | APIC [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       1,228,095       1,228,370 1,228,095 1,228,370 0
Issuance of common stock                 (5,629) (275)  
Reclassification of net parent investment to APIC                     1,228,370
Balance 1,222,466       1,228,095       1,222,466 1,228,095 1,228,370
Parent Company [Member] | Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       351,439         351,439    
Net income                 176,340 351,439  
Balance 527,779       351,439       527,779 351,439  
Issuer [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       910,051         910,051    
Net income                 114,861 312,485 154,136
Balance 1,030,855       910,051       1,030,855 910,051  
Issuer [Member] | Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       1       1 1 1 0
Issuance of stock at the separation and distribution                     1
Balance 1       1       1 1 1
Issuer [Member] | APIC [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       558,611       548,758 558,611 548,758 0
Amounts related to share-based compensation                 (3,075) (582)  
Reclassification of net parent investment to APIC                     546,311
Share-based compensation expense                 9,015 10,435 2,914
Issuance of stock at the separation and distribution                     (467)
Balance 564,551       558,611       564,551 558,611 548,758
Issuer [Member] | Net Parent Investment [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance               0   0 1,123,467
Reclassification of net parent investment to APIC                     (552,073)
Net income                     114,668
Dividend paid to former parent                     (650,000)
Net transfers to/between former parent                     (36,062)
Balance                     0
Issuer [Member] | Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       351,439       38,954 351,439 38,954 0
Net income                 114,861 312,485 38,954
Balance 466,300       351,439       466,300 351,439 38,954
Guarantor Subsidiaries [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       52,063         52,063    
Net income                 (1) (1) (1)
Balance 52,062       52,063       52,062 52,063  
Guarantor Subsidiaries [Member] | Common Stock [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       60       60 60 60 0
Issuance of stock at the separation and distribution                     60
Balance 60       60       60 60 60
Guarantor Subsidiaries [Member] | APIC [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       52,004       52,004 52,004 52,004 0
Reclassification of net parent investment to APIC                     52,004
Balance 52,004       52,004       52,004 52,004 52,004
Guarantor Subsidiaries [Member] | Net Parent Investment [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance               0   0 53,895
Reclassification of net parent investment to APIC                     (53,895)
Balance                     0
Guarantor Subsidiaries [Member] | Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       (1)         (1)    
Net income                 (1) (1)  
Balance (2)       (1)       (2) (1)  
Non-Guarantor Subsidiaries [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       125,202         125,202    
Net income                 (22,730) 20,903 80,898
Balance 154,338       125,202       154,338 125,202  
Non-Guarantor Subsidiaries [Member] | APIC [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       35,677       35,677 35,677 35,677 0
Reclassification of equity                 51,866    
Reclassification of net parent investment to APIC                     35,677
Balance 87,543       35,677       87,543 35,677 35,677
Non-Guarantor Subsidiaries [Member] | Net Parent Investment [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance               0   0 117,550
Reclassification of net parent investment to APIC                     (130,339)
Net income                     12,789
Balance                     0
Non-Guarantor Subsidiaries [Member] | Retained Earnings [Member]                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance       $ 89,525       $ 68,622 89,525 68,622 0
Net income                 (22,730) 20,903 68,622
Balance $ 66,795       $ 89,525       $ 66,795 $ 89,525 $ 68,622