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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities        
Net cash from operating activities $ 422,551 $ 300,339 $ 326,674  
Cash flows from investing activities        
Capital expenditures (190,464) (160,358) (131,170)  
Net Investing Activity with Affiliates 0   0  
Proceeds from Equity Method Investment, Distribution 0 0 0  
Proceeds (Payments) from Investments in Development Agreement (35,108) 0 0  
Payments to (Proceeds from) Combined Other Investing Activities 706      
Cash paid for acquisitions, net of cash received (1,153) (592,703) 0  
Other investing activities 706 14,207 4,528  
Net cash used in investing activities (226,019) (738,854) (126,642)  
Cash flows from financing activities        
Borrowings under bank credit facility 958,000 2,276,175 1,379,000  
Payments under bank credit facility (1,119,485) (2,366,112) (1,636,350)  
Debt financing costs, net (3,430) (42,220) (14,004)  
Premium and Consent Fees Paid 0 (15,750) (24,246)  
Net Financing Activity with Affiliates 0 (1,295) 3,689  
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries 0 0    
Share-based compensation activities, net (7,711) (1,295) 3,689  
Stock Repurchased During Period, Value (31,927)      
Payments of Ordinary Dividends, Common Stock (11,286) 0 0  
Proceeds from (Payments for) Other Financing Activities (503) 45 0  
Net cash provided by (used in) financing activities (215,336) (99,247) (199,724)  
Proceeds from Issuance of Senior Long-term Debt 0 750,000 750,000  
Payments on Retirements of Long-term Debt 0 700,000 657,813  
Cash flows from operating activities (514) (27,796) 14,095  
Cash flows from investing activities 36,247 598,057 0  
Cash flows from financing activities 0 0 0  
Net cash provided by discontinued operations 35,733 570,261 14,095  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 16,929 32,499 14,403  
Proceeds from Issuance of Long-term Debt   0 0  
Proceeds from Contributions from Parent     0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 227,279 210,350 177,851 $ 163,448
Parent Company [Member]        
Cash flows from operating activities        
Net cash from operating activities (82,632) (86,502) 102,080  
Cash flows from investing activities        
Capital expenditures (102,277) (42,840) (48,591)  
Net Investing Activity with Affiliates 0 0 0  
Proceeds from Equity Method Investment, Distribution 10,867 9,150 11,200  
Proceeds (Payments) from Investments in Development Agreement 0      
Payments to (Proceeds from) Combined Other Investing Activities 0      
Cash paid for acquisitions, net of cash received (1,153) (592,703)    
Other investing activities   0 3,292  
Net cash used in investing activities (92,563) (626,393) (34,099)  
Cash flows from financing activities        
Borrowings under bank credit facility 958,000 2,039,175 1,033,500  
Payments under bank credit facility (1,119,485) (1,466,362) (1,211,200)  
Debt financing costs, net (3,430) (42,220) (14,004)  
Premium and Consent Fees Paid   (15,750) (24,246)  
Net Financing Activity with Affiliates 389,579 (1,295) 3,689  
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries 0 0    
Share-based compensation activities, net (7,711)      
Stock Repurchased During Period, Value (31,927)      
Payments of Ordinary Dividends, Common Stock (11,286)      
Proceeds from (Payments for) Other Financing Activities (590) 45    
Net cash provided by (used in) financing activities 174,330 714,105 (67,981)  
Proceeds from Issuance of Senior Long-term Debt   750,000 750,000  
Payments on Retirements of Long-term Debt   350,000 500,000  
Cash flows from operating activities 0 0 0  
Cash flows from investing activities 0 0 0  
Cash flows from financing activities 0 0 0  
Net cash provided by discontinued operations 0 0 0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect (865) 1,210 0  
Proceeds from Issuance of Long-term Debt   (199,398) (105,720)  
Proceeds from Contributions from Parent     0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 347 1,212 2 2
Guarantor Subsidiaries        
Cash flows from operating activities        
Net cash from operating activities 519,608 380,803 237,010  
Cash flows from investing activities        
Capital expenditures (87,590) (116,834) (82,392)  
Net Investing Activity with Affiliates (443,542) 211,300 (66,691)  
Proceeds from Equity Method Investment, Distribution 0 0 0  
Proceeds (Payments) from Investments in Development Agreement 0      
Payments to (Proceeds from) Combined Other Investing Activities 706      
Cash paid for acquisitions, net of cash received 0 0    
Other investing activities   7,529 1,236  
Net cash used in investing activities (530,426) 101,995 (147,847)  
Cash flows from financing activities        
Borrowings under bank credit facility 0 237,000 345,500  
Payments under bank credit facility 0 (899,750) (425,150)  
Debt financing costs, net 0 0 0  
Premium and Consent Fees Paid   0 0  
Net Financing Activity with Affiliates 0 0 0  
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries (10,475) (9,000)    
Share-based compensation activities, net 0      
Stock Repurchased During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Other Financing Activities 87 0    
Net cash provided by (used in) financing activities (10,562) (1,021,750) (90,753)  
Proceeds from Issuance of Senior Long-term Debt   0 0  
Payments on Retirements of Long-term Debt   350,000 3  
Cash flows from operating activities (514) (27,796) 14,095  
Cash flows from investing activities 36,247 598,057 0  
Cash flows from financing activities 0 0 0  
Net cash provided by discontinued operations 35,733 570,261 14,095  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 14,353 31,309 12,505  
Proceeds from Issuance of Long-term Debt   0 0  
Proceeds from Contributions from Parent     (11,100)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 213,963 199,610 168,301 155,796
Non-Guarantor Subsidiaries (100% Owned)        
Cash flows from operating activities        
Net cash from operating activities (15,628) 7,234 (12,131)  
Cash flows from investing activities        
Capital expenditures (597) (684) (187)  
Net Investing Activity with Affiliates 0 0 0  
Proceeds from Equity Method Investment, Distribution 0 0 0  
Proceeds (Payments) from Investments in Development Agreement (35,108)      
Payments to (Proceeds from) Combined Other Investing Activities 0      
Cash paid for acquisitions, net of cash received 0 0    
Other investing activities   6,678 0  
Net cash used in investing activities (35,705) 5,994 (187)  
Cash flows from financing activities        
Borrowings under bank credit facility 0 0 0  
Payments under bank credit facility 0 0 0  
Debt financing costs, net 0 0 0  
Premium and Consent Fees Paid   0 0  
Net Financing Activity with Affiliates 55,166 0 0  
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries (392) (150)    
Share-based compensation activities, net 0      
Stock Repurchased During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Other Financing Activities 0 0    
Net cash provided by (used in) financing activities 54,774 (13,027) 14,214  
Proceeds from Issuance of Senior Long-term Debt   0 0  
Payments on Retirements of Long-term Debt   0 157,810  
Cash flows from operating activities 0 0 0  
Cash flows from investing activities 0 0 0  
Cash flows from financing activities 0 0 0  
Net cash provided by discontinued operations 0 0 0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 3,441 201 1,896  
Proceeds from Issuance of Long-term Debt   (12,877) 172,124  
Proceeds from Contributions from Parent     (100)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 12,969 9,528 9,327 7,431
Non-Guarantor Subsidiaries (Not 100% Owned)        
Cash flows from operating activities        
Net cash from operating activities 254 0 (76)  
Cash flows from investing activities        
Capital expenditures 0 0 0  
Net Investing Activity with Affiliates 0 0 0  
Proceeds from Equity Method Investment, Distribution 0 0 0  
Proceeds (Payments) from Investments in Development Agreement 0      
Payments to (Proceeds from) Combined Other Investing Activities 0      
Cash paid for acquisitions, net of cash received 0 0    
Other investing activities   0 0  
Net cash used in investing activities 0 0 0  
Cash flows from financing activities        
Borrowings under bank credit facility 0 0 0  
Payments under bank credit facility 0 0 0  
Debt financing costs, net 0 0 0  
Premium and Consent Fees Paid   0 0  
Net Financing Activity with Affiliates (254) 0 0  
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries 0 0    
Share-based compensation activities, net 0      
Stock Repurchased During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Other Financing Activities 0 0    
Net cash provided by (used in) financing activities (254) (221) 78  
Proceeds from Issuance of Senior Long-term Debt   0 0  
Payments on Retirements of Long-term Debt   0 0  
Cash flows from operating activities 0 0 0  
Cash flows from investing activities 0 0 0  
Cash flows from financing activities 0 0 0  
Net cash provided by discontinued operations 0 0 0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 0 (221) 2  
Proceeds from Issuance of Long-term Debt   (221) 78  
Proceeds from Contributions from Parent     0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0 221 219
Eliminations [Member]        
Cash flows from operating activities        
Net cash from operating activities 949 (1,196) (209)  
Cash flows from investing activities        
Capital expenditures 0 0 0  
Net Investing Activity with Affiliates 443,542 (211,300) 66,691  
Proceeds from Equity Method Investment, Distribution (10,867) (9,150) (11,200)  
Proceeds (Payments) from Investments in Development Agreement 0      
Payments to (Proceeds from) Combined Other Investing Activities 0      
Cash paid for acquisitions, net of cash received 0 0    
Other investing activities   0 0  
Net cash used in investing activities 432,675 (220,450) 55,491  
Cash flows from financing activities        
Borrowings under bank credit facility 0 0 0  
Payments under bank credit facility 0 0 0  
Debt financing costs, net 0 0 0  
Premium and Consent Fees Paid   0 0  
Net Financing Activity with Affiliates (444,491) 0 0  
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries 10,867 9,150    
Share-based compensation activities, net 0      
Stock Repurchased During Period, Value 0      
Payments of Ordinary Dividends, Common Stock 0      
Proceeds from (Payments for) Other Financing Activities 0      
Net cash provided by (used in) financing activities (433,624) 221,646 (55,282)  
Proceeds from Issuance of Senior Long-term Debt   0 0  
Payments on Retirements of Long-term Debt     0  
Cash flows from operating activities 0 0 0  
Cash flows from investing activities 0 0 0  
Cash flows from financing activities 0 0 0  
Net cash provided by discontinued operations 0 0 0  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 0 0 0  
Proceeds from Issuance of Long-term Debt   212,496 (66,482)  
Proceeds from Contributions from Parent     11,200  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 0 0 $ 0 $ 0
Consolidation, Eliminations [Member]        
Cash flows from financing activities        
Proceeds from (Payments for) Other Financing Activities   0    
Payments on Retirements of Long-term Debt   $ 0