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Guarantor Subsidiaries (Consolidating And Combining Statement Of Changes In Equity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2013
APIC [Member]
Dec. 31, 2013
Net Parent Investment [Member]
Dec. 31, 2012
Net Parent Investment [Member]
Dec. 31, 2011
Net Parent Investment [Member]
Dec. 31, 2013
Retained Earnings [Member]
Dec. 31, 2013
Eliminations [Member]
Dec. 31, 2012
Eliminations [Member]
Dec. 31, 2013
Eliminations [Member]
Common Stock [Member]
Dec. 31, 2013
Eliminations [Member]
APIC [Member]
Dec. 31, 2013
Eliminations [Member]
Net Parent Investment [Member]
Dec. 31, 2011
Eliminations [Member]
Net Parent Investment [Member]
Dec. 31, 2010
Eliminations [Member]
Net Parent Investment [Member]
Dec. 31, 2013
Parent Company [Member]
Dec. 31, 2013
Parent Company [Member]
Common Stock [Member]
Dec. 31, 2013
Parent Company [Member]
APIC [Member]
Dec. 31, 2013
Issuer [Member]
Dec. 31, 2012
Issuer [Member]
Dec. 31, 2011
Issuer [Member]
Dec. 31, 2013
Issuer [Member]
Common Stock [Member]
Dec. 31, 2013
Issuer [Member]
APIC [Member]
Dec. 31, 2013
Issuer [Member]
Net Parent Investment [Member]
Dec. 31, 2012
Issuer [Member]
Net Parent Investment [Member]
Dec. 31, 2011
Issuer [Member]
Net Parent Investment [Member]
Dec. 31, 2013
Issuer [Member]
Retained Earnings [Member]
Dec. 31, 2013
Guarantor Subsidiaries [Member]
Dec. 31, 2012
Guarantor Subsidiaries [Member]
Dec. 31, 2011
Guarantor Subsidiaries [Member]
Dec. 31, 2013
Guarantor Subsidiaries [Member]
Common Stock [Member]
Dec. 31, 2013
Guarantor Subsidiaries [Member]
APIC [Member]
Dec. 31, 2013
Guarantor Subsidiaries [Member]
Net Parent Investment [Member]
Dec. 31, 2012
Guarantor Subsidiaries [Member]
Net Parent Investment [Member]
Dec. 31, 2011
Guarantor Subsidiaries [Member]
Net Parent Investment [Member]
Dec. 31, 2013
Non-Guarantor Subsidiaries [Member]
Dec. 31, 2012
Non-Guarantor Subsidiaries [Member]
Dec. 31, 2011
Non-Guarantor Subsidiaries [Member]
Dec. 31, 2013
Non-Guarantor Subsidiaries [Member]
APIC [Member]
Dec. 31, 2013
Non-Guarantor Subsidiaries [Member]
Net Parent Investment [Member]
Dec. 31, 2012
Non-Guarantor Subsidiaries [Member]
Net Parent Investment [Member]
Dec. 31, 2011
Non-Guarantor Subsidiaries [Member]
Net Parent Investment [Member]
Dec. 31, 2013
Non-Guarantor Subsidiaries [Member]
Retained Earnings [Member]
Condensed Financial Statements, Captions [Line Items]                                                                                                        
Balance       $ 1,104,451       $ 1,118,947 $ 1,104,451 $ 1,118,947 $ 1,808,150     $ 1,104,451 $ 1,118,947 $ 1,808,150   $ (1,316,577) $ (190,461)     $ (190,461) $ (190,461) $ (190,461) $ 1,228,837     $ 1,123,467         $ 1,123,467 $ 1,043,914 $ 1,788,796   $ 53,895         $ 53,895 $ 2,166 $ (46,108) $ 117,550       $ 117,550 $ 263,328 $ 255,923  
Net income 93,600 41,700 77,600 22,100 19,100 11,000 66,200 (12,700) 235,033 83,568 324,020     127,457 83,568 324,020 107,576                     154,136 138,417 357,130     114,668 138,416 306,327 38,954 (1) (2) (13)         234 80,898 (54,847) (33,097)   12,789 (54,848) 17,459 68,622
Dividend paid to former parent                 (650,000)         (650,000)                                     (650,000)                                      
Net transfers to/between former parent                 (36,062) (98,064) (1,013,223)     (36,062) (98,064) (1,013,223)                                 (36,062) (58,863) (1,051,209)               51,729 48,040           (90,930) (10,054)  
Issuance of stock at the separation and distribution                       467 (467)             (61)           467         1 (467)               60                        
Reclassification of net parent to APIC                         545,846 (545,846)             (1,316,516) 190,461         1,228,370         546,311 (552,073)               52,004 (53,895)           35,677 (130,339)      
Share-based compensation expense                 2,914       2,914                                     2,914                                        
Balance $ 656,336       $ 1,104,451       $ 656,336 $ 1,104,451 $ 1,118,947 $ 467 $ 548,293   $ 1,104,451 $ 1,118,947 $ 107,576 $ (1,316,577) $ (190,461) $ (61) $ (1,316,516)   $ (190,461) $ (190,461) $ 1,228,837 $ 467 $ 1,228,370 $ 587,713 $ 1,123,467   $ 1 $ 548,758   $ 1,123,467 $ 1,043,914 $ 38,954 $ 52,064 $ 53,895   $ 60 $ 52,004   $ 53,895 $ 2,166 $ 104,299 $ 117,550   $ 35,677   $ 117,550 $ 263,328 $ 68,622
Balance, shares                       46,743,633