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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities        
Net cash from operating activities $ 112,045 $ 80,376    
Cash flows from investing activities        
Capital expenditures (80,038) (35,297)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement (35,108) 0    
Other investing activities 44 5    
Net cash used in investing activities (115,102) (35,292)    
Cash flows from financing activities        
Borrowings under bank credit facility 256,700 319,100    
Payments under bank credit facility (275,063) (645,075)    
Proceeds from issuance of senior notes 0 750,000    
Debt issue costs (1,889) (12,996)    
Net activity with affiliates 0 0    
Share-based compensation activities, net (3,826) (1,387)    
Proceeds from (Payments for) Combined Other Financing Activities (95)      
Net cash provided by (used in) financing activities (24,173) 409,642    
Cash flows from operating activities (255) 2,654    
Cash flows from investing activities 630 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 375 2,654    
Cash and cash equivalents, beginning of period 193,862 158,821    
Cash and cash equivalents, end of period (193,862) (158,821) $ (167,007) $ (616,201)
Net change in cash and cash equivalents (26,855) 457,380    
Parent        
Cash flows from operating activities        
Net cash from operating activities 22,216 (35,967)    
Cash flows from investing activities        
Capital expenditures (57,069) (11,143)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement 0      
Other investing activities 0 0    
Net cash used in investing activities (57,069) (11,143)    
Cash flows from financing activities        
Borrowings under bank credit facility 256,700 223,900    
Payments under bank credit facility (275,063) (530,350)    
Proceeds from issuance of senior notes   750,000    
Debt issue costs (1,889) (12,996)    
Net activity with affiliates 59,547 120,188    
Share-based compensation activities, net (3,826) (1,387)    
Proceeds from (Payments for) Combined Other Financing Activities (50)      
Net cash provided by (used in) financing activities 35,419 549,355    
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) (1,778) (502,247)
Net change in cash and cash equivalents 566 502,245    
Guarantor Subsidiaries        
Cash flows from operating activities        
Net cash from operating activities 107,207 104,588    
Cash flows from investing activities        
Capital expenditures (22,951) (23,987)    
Net activity with affiliates (111,053) (108,572)    
Advances pursuant to development agreement 0      
Other investing activities 44 5    
Net cash used in investing activities (133,960) (132,554)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 95,200    
Payments under bank credit facility 0 (114,725)    
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    
Proceeds from (Payments for) Combined Other Financing Activities (45)      
Net cash provided by (used in) financing activities (45) (19,525)    
Cash flows from operating activities (255) 2,654    
Cash flows from investing activities 630 0    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 375 2,654    
Cash and cash equivalents, beginning of period 189,364 156,116    
Cash and cash equivalents, end of period (189,364) (156,116) (162,941) (111,279)
Net change in cash and cash equivalents (26,423) (44,837)    
Non-Guarantor Subsidiaries (100% Owned)        
Cash flows from operating activities        
Net cash from operating activities (18,104) 11,771    
Cash flows from investing activities        
Capital expenditures (18) (167)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement (35,108)      
Other investing activities 0 0    
Net cash used in investing activities (35,126) (167)    
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 52,232 (11,632)    
Share-based compensation activities, net 0 0    
Proceeds from (Payments for) Combined Other Financing Activities 0      
Net cash provided by (used in) financing activities 52,232 (11,632)    
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) (2,288) (2,454)
Net change in cash and cash equivalents (998) (28)    
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    
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 472 (16)    
Cash flows from investing activities        
Capital expenditures 0 0    
Net activity with affiliates 111,053 108,572    
Advances pursuant to development agreement 0      
Other investing activities 0 0    
Net cash used in investing activities 111,053 108,572    
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 (111,525) (108,556)    
Share-based compensation activities, net 0 0    
Proceeds from (Payments for) Combined Other Financing Activities 0      
Net cash provided by (used in) financing activities (111,525) (108,556)    
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