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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities        
Net cash from operating activities $ 155,776 $ 138,329    
Cash flows from investing activities        
Capital expenditures (58,112) (53,509)    
Net activity with affiliates 0 0    
Other investing activities 2,975 1,124    
Net cash used in investing activities (55,137) (52,385)    
Cash flows from financing activities        
Borrowings under bank credit facility 566,900 770,300    
Payments under bank credit facility (902,712) (872,212)    
Payments on retirements of long-term debt (500,000) 0    
Premium and consent fees paid (24,246) 0    
Proceeds from issuance of senior secured notes 750,000 0    
Debt issue costs (13,496) 0    
Net activity with affiliates 0 0    
Share-based compensation activities, net 2,100 703    
Proceeds from (Payments for) Combined Other Financing Activities (3) (61)    
Net cash used in financing activities (121,457) (101,270)    
Cash and cash equivalents, beginning of period 145,341 177,838    
Cash and cash equivalents, end of period (145,341) (177,838) $ (124,523) $ (162,512)
Net change in cash and cash equivalents (20,818) (15,326)    
Parent        
Cash flows from operating activities        
Net cash from operating activities (40,933) (33,921)    
Cash flows from investing activities        
Capital expenditures (24,876) (11,493)    
Net activity with affiliates 0 0    
Other investing activities 0 660    
Net cash used in investing activities (24,876) (10,833)    
Cash flows from financing activities        
Borrowings under bank credit facility 396,100 365,700    
Payments under bank credit facility (679,525) (424,925)    
Payments on retirements of long-term debt (500,000)      
Premium and consent fees paid (24,246)      
Proceeds from issuance of senior secured notes 750,000      
Debt issue costs (13,496)      
Net activity with affiliates 134,874 107,139    
Share-based compensation activities, net 2,100 703    
Proceeds from (Payments for) Combined Other Financing Activities 0 (57)    
Net cash used in financing activities 65,807 48,560    
Cash and cash equivalents, beginning of period 2 0    
Cash and cash equivalents, end of period (2) 0 0 (3,806)
Net change in cash and cash equivalents (2) 3,806    
Guarantor Subsidiaries        
Cash flows from operating activities        
Net cash from operating activities 150,591 125,168    
Cash flows from investing activities        
Capital expenditures (21,366) (19,470)    
Net activity with affiliates (147,126) (116,526)    
Other investing activities 0 0    
Net cash used in investing activities (168,492) (135,996)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Payments on retirements of long-term debt 0      
Premium and consent fees paid 0      
Proceeds from issuance of senior secured notes 0      
Debt issue costs 0      
Net activity with affiliates 0 0    
Share-based compensation activities, net 0 0    
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash used in financing activities 0 0    
Cash and cash equivalents, beginning of period 111,452 106,445    
Cash and cash equivalents, end of period (111,452) (106,445) (93,551) (95,617)
Net change in cash and cash equivalents (17,901) (10,828)    
Non-Guarantor Subsidiaries (100% Owned)        
Cash flows from operating activities        
Net cash from operating activities 36,811 38,377    
Cash flows from investing activities        
Capital expenditures (11,870) (14,018)    
Net activity with affiliates 0 5,892    
Other investing activities 2,975 13    
Net cash used in investing activities (8,895) (8,113)    
Cash flows from financing activities        
Borrowings under bank credit facility 170,800 155,900    
Payments under bank credit facility (223,187) (189,887)    
Payments on retirements of long-term debt 0      
Premium and consent fees paid 0      
Proceeds from issuance of senior secured notes 0      
Debt issue costs 0      
Net activity with affiliates 21,559 0    
Share-based compensation activities, net 0 0    
Proceeds from (Payments for) Combined Other Financing Activities (3) (4)    
Net cash used in financing activities (30,831) (33,991)    
Cash and cash equivalents, beginning of period 33,668 33,766    
Cash and cash equivalents, end of period (33,668) (33,766) (30,753) (30,039)
Net change in cash and cash equivalents (2,915) (3,727)    
Non-Guarantor Subsidiaries (Not 100% Owned)        
Cash flows from operating activities        
Net cash from operating activities (70) 12,118    
Cash flows from investing activities        
Capital expenditures 0 (8,528)    
Net activity with affiliates 0 82    
Other investing activities 0 451    
Net cash used in investing activities 0 (7,995)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 248,700    
Payments under bank credit facility 0 (257,400)    
Payments on retirements of long-term debt 0      
Premium and consent fees paid 0      
Proceeds from issuance of senior secured notes 0      
Debt issue costs 0      
Net activity with affiliates 70 0    
Share-based compensation activities, net 0 0    
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash used in financing activities 70 (8,700)    
Cash and cash equivalents, beginning of period 219 37,627    
Cash and cash equivalents, end of period (219) (37,627) (219) (33,050)
Net change in cash and cash equivalents 0 (4,577)    
Eliminations        
Cash flows from operating activities        
Net cash from operating activities 9,377 (3,413)    
Cash flows from investing activities        
Capital expenditures 0 0    
Net activity with affiliates 147,126 110,552    
Other investing activities 0 0    
Net cash used in investing activities 147,126 110,552    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Payments on retirements of long-term debt 0      
Premium and consent fees paid 0      
Proceeds from issuance of senior secured notes 0      
Debt issue costs 0      
Net activity with affiliates (156,503) (107,139)    
Share-based compensation activities, net 0 0    
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash used in financing activities (156,503) (107,139)    
Cash and cash equivalents, beginning of period 0 0    
Cash and cash equivalents, end of period 0 0 $ 0 $ 0
Net change in cash and cash equivalents $ 0 $ 0