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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities        
Net cash from operating activities $ 118,525 $ 117,604    
Cash flows from investing activities        
Capital expenditures (25,918) (80,038)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement 0 35,108    
Other investing activities (500) 44    
Net cash used in investing activities (26,418) (115,102)    
Cash flows from financing activities        
Borrowings under bank credit facility 179,600 256,700    
Payments under bank credit facility (264,403) (275,063)    
Debt issue costs (9) (1,889)    
Net activity with affiliates 0 0    
Share-based compensation activities, net (3,589) (3,826)    
Stock Repurchased and Retired During Period, Value (19,803) 0    
Payments of Ordinary Dividends, Common Stock (5,632) 0    
Proceeds from (Payments for) Combined Other Financing Activities (50) (95)    
Net cash provided by (used in) financing activities (113,886) (24,173)    
Cash flows from operating activities 0 (255)    
Cash flows from investing activities 0 630    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 0 375    
Cash and cash equivalents, beginning of period 205,500 189,054 $ 227,279 $ 210,350
Net change in cash, cash equivalents and restricted cash (21,779) (21,296)    
Parent        
Cash flows from operating activities        
Net cash from operating activities (19,900) 22,216    
Cash flows from investing activities        
Capital expenditures (13,097) (57,069)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement   0    
Other investing activities (500) 0    
Net cash used in investing activities (13,597) (57,069)    
Cash flows from financing activities        
Borrowings under bank credit facility 179,600 256,700    
Payments under bank credit facility (264,403) (275,063)    
Debt issue costs (9) (1,889)    
Net activity with affiliates 146,984 59,547    
Share-based compensation activities, net (3,589) (3,826)    
Stock Repurchased and Retired During Period, Value (19,803)      
Payments of Ordinary Dividends, Common Stock 5,632      
Proceeds from (Payments for) Combined Other Financing Activities 0 (50)    
Net cash provided by (used in) financing activities 33,148 35,419    
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 (2) 1,778 347 1,212
Net change in cash, cash equivalents and restricted cash (349) 566    
Guarantor Subsidiaries        
Cash flows from operating activities        
Net cash from operating activities 144,168 110,202    
Cash flows from investing activities        
Capital expenditures (12,692) (22,951)    
Net activity with affiliates (154,344) (110,461)    
Advances pursuant to development agreement   0    
Other investing activities 0 44    
Net cash used in investing activities (167,036) (133,368)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 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      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Combined Other Financing Activities (50) (45)    
Net cash provided by (used in) financing activities (50) (45)    
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 191,045 176,399 213,963 199,610
Net change in cash, cash equivalents and restricted cash (22,918) (23,211)    
Non-Guarantor Subsidiaries (100% Owned)        
Cash flows from operating activities        
Net cash from operating activities (5,115) (15,757)    
Cash flows from investing activities        
Capital expenditures (129) (18)    
Net activity with affiliates 0 0    
Advances pursuant to development agreement   35,108    
Other investing activities 0 0    
Net cash used in investing activities (129) (35,126)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Debt issue costs 0 0    
Net activity with affiliates 6,732 52,232    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash provided by (used in) financing activities 6,732 52,232    
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 14,457 10,877 12,969 9,528
Net change in cash, cash equivalents and restricted cash 1,488 1,349    
Non-Guarantor Subsidiaries (Not 100% Owned)        
Cash flows from operating activities        
Net cash from operating activities 0 254    
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    
Debt issue costs 0 0    
Net activity with affiliates 0 (254)    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash provided by (used in) financing activities 0 (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 0 0
Net change in cash, cash equivalents and restricted cash 0 0    
Subsidiary, Wholly Owned [Member]        
Cash flows from operating activities        
Net cash from operating activities 0 217    
Cash flows from investing activities        
Capital expenditures 0 0    
Net activity with affiliates 0 (592)    
Advances pursuant to development agreement   0    
Other investing activities 0 0    
Net cash used in investing activities 0 (592)    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 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      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash provided by (used in) financing activities 0 0    
Cash flows from operating activities 0 (255)    
Cash flows from investing activities 0 630    
Cash flows from financing activities 0 0    
Net cash provided by discontinued operations 0      
Cash and cash equivalents, beginning of period 0 0 0 0
Net change in cash, cash equivalents and restricted cash 0 0    
Eliminations        
Cash flows from operating activities        
Net cash from operating activities (628) 472    
Cash flows from investing activities        
Capital expenditures 0 0    
Net activity with affiliates 154,344 111,053    
Advances pursuant to development agreement   0    
Other investing activities 0 0    
Net cash used in investing activities 154,344 111,053    
Cash flows from financing activities        
Borrowings under bank credit facility 0 0    
Payments under bank credit facility 0 0    
Debt issue costs 0 0    
Net activity with affiliates (153,716) (111,525)    
Share-based compensation activities, net 0 0    
Stock Repurchased and Retired During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Combined Other Financing Activities 0 0    
Net cash provided by (used in) financing activities (153,716) (111,525)    
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 $ 0 $ 0
Net change in cash, cash equivalents and restricted cash $ 0 $ 0