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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities        
Net cash from operating activities $ 195,234 $ 160,261    
Cash flows from investing activities        
Capital expenditures (118,751) (72,447)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement (35,108) 0    
Other investing activities 492 704    
Net cash used in investing activities (153,367) (71,743)    
Cash flows from financing activities        
Borrowings under bank credit facility 535,900 388,900    
Payments under bank credit facility (628,037) (747,575)    
Proceeds from issuance of senior notes 0 750,000    
Debt issue costs (2,381) (12,936)    
Net activity with affiliates 0 0    
Share-based compensation activities, net (2,796) (104)    
Stock Repurchased and Retired During Period, Value (11,090) 0    
Proceeds from (Payments for) Combined Other Financing Activities (95)      
Net cash provided by (used in) financing activities (108,499) 378,285    
Cash flows from operating activities (514) 2,654    
Cash flows from investing activities 36,247 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 35,733 2,654    
Cash and cash equivalents, beginning of period 193,862 158,821    
Cash and cash equivalents, end of period (193,862) (158,821) $ (162,963) $ (628,278)
Net change in cash and cash equivalents (30,899) 469,457    
Parent        
Cash flows from operating activities        
Net cash from operating activities (32,014) (59,978)    
Cash flows from investing activities        
Capital expenditures (68,685) (19,456)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement 0      
Other investing activities 0 0    
Net cash used in investing activities (68,685) (19,456)    
Cash flows from financing activities        
Borrowings under bank credit facility 535,900 223,900    
Payments under bank credit facility (628,037) (530,350)    
Proceeds from issuance of senior notes   750,000    
Debt issue costs (2,381) (12,936)    
Net activity with affiliates 207,941 161,524    
Share-based compensation activities, net (2,796) (104)    
Stock Repurchased and Retired During Period, Value (11,090)      
Proceeds from (Payments for) Combined Other Financing Activities (50)      
Net cash provided by (used in) financing activities 99,487 592,034    
Cash flows from operating activities 0 0    
Cash flows from investing activities 0 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 0 0    
Cash and cash equivalents, beginning of period 1,212 2    
Cash and cash equivalents, end of period (1,212) (2) 0 (512,602)
Net change in cash and cash equivalents (1,212) 512,600    
Guarantor Subsidiaries        
Cash flows from operating activities        
Net cash from operating activities 235,898 210,976    
Cash flows from investing activities        
Capital expenditures (49,966) (52,470)    
Net activity with affiliates (250,886) (152,274)    
Advances pursuant to development agreement 0      
Other investing activities 492 704    
Net cash used in investing activities (300,360) (204,040)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 165,000    
Payments under bank credit facility 0 (217,225)    
Proceeds from issuance of senior notes   0    
Debt issue costs 0 0    
Net activity with affiliates 0 0    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Proceeds from (Payments for) Combined Other Financing Activities (45)      
Net cash provided by (used in) financing activities (45) (52,225)    
Cash flows from operating activities (514) 2,654    
Cash flows from investing activities 36,247 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 35,733 2,654    
Cash and cash equivalents, beginning of period 189,364 156,116    
Cash and cash equivalents, end of period (189,364) (156,116) (160,590) (113,481)
Net change in cash and cash equivalents (28,774) (42,635)    
Non-Guarantor Subsidiaries (100% Owned)        
Cash flows from operating activities        
Net cash from operating activities (10,027) 9,283    
Cash flows from investing activities        
Capital expenditures (100) (521)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement (35,108)      
Other investing activities 0 0    
Net cash used in investing activities (35,208) (521)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Proceeds from issuance of senior notes   0    
Debt issue costs 0 0    
Net activity with affiliates 44,322 (9,270)    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Proceeds from (Payments for) Combined Other Financing Activities 0      
Net cash provided by (used in) financing activities 44,322 (9,270)    
Cash flows from operating activities 0 0    
Cash flows from investing activities 0 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 0 0    
Cash and cash equivalents, beginning of period 3,286 2,482    
Cash and cash equivalents, end of period (3,286) (2,482) (2,373) (1,974)
Net change in cash and cash equivalents (913) (508)    
Non-Guarantor Subsidiaries (Not 100% Owned)        
Cash flows from operating activities        
Net cash from operating activities 254 0    
Cash flows from investing activities        
Capital expenditures 0 0    
Net activity with affiliates 0 0    
Advances pursuant to development agreement 0      
Other investing activities 0 0    
Net cash used in investing activities 0 0    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Proceeds from issuance of senior notes   0    
Debt issue costs 0 0    
Net activity with affiliates (254) 0    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Proceeds from (Payments for) Combined Other Financing Activities 0      
Net cash provided by (used in) financing activities (254) 0    
Cash flows from operating activities 0 0    
Cash flows from investing activities 0 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 0 0    
Cash and cash equivalents, beginning of period 0 221    
Cash and cash equivalents, end of period 0 (221) 0 (221)
Net change in cash and cash equivalents 0 0    
Eliminations        
Cash flows from operating activities        
Net cash from operating activities 1,123 (20)    
Cash flows from investing activities        
Capital expenditures 0 0    
Net activity with affiliates 250,886 152,274    
Advances pursuant to development agreement 0      
Other investing activities 0 0    
Net cash used in investing activities 250,886 152,274    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Proceeds from issuance of senior notes   0    
Debt issue costs 0 0    
Net activity with affiliates (252,009) (152,254)    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Proceeds from (Payments for) Combined Other Financing Activities 0      
Net cash provided by (used in) financing activities (252,009) (152,254)    
Cash flows from operating activities 0 0    
Cash flows from investing activities 0 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 0 0    
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