Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Accumulated Loss [Member]
Noncontrolling Interest [Member]
Parent Company [Member]
Parent Company [Member]
Common Stock [Member]
Parent Company [Member]
Treasury Stock [Member]
Parent Company [Member]
Additional Paid-in Capital [Member]
Parent Company [Member]
Accumulated Loss [Member]
Parent Company [Member]
Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2016 $ 1,878,744   $ 891,246 $ 987,498 $ 875 $ (2,500) $ 1,145,760 $ (94,270) $ (62,367)
Beginning balance (in shares) at Dec. 31, 2016         87,521,651 110,964      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of Class A common stock under equity incentive award plan         $ 3   (3)    
Issuance of Class A common stock under equity incentive award plan, shares         231,311        
Repurchase of shares for employee tax withholding (97)     (97)   $ (97)      
Repurchase of shares for employee tax withholding, shares           (4,182)      
Stock-based compensation 2,768     2,768     2,768    
Dividends declared (72,934)     (72,934)     (72,934)    
Contributions from noncontrolling interests 325,600 $ 0 325,600            
Distributions to noncontrolling interests (9,164) 0 (9,164)            
Other (270)   (127) (143)     (143)    
Net loss (12,145)   (32,018) 19,873       19,873  
Other comprehensive income (loss), net of tax 15,212   (107) 15,319         15,319
Ending balance at Jun. 30, 2017 2,127,714   1,175,430 952,284 $ 878 $ (2,597) 1,075,448 (74,397) (47,048)
Ending balance (in shares) at Jun. 30, 2017         87,752,962 115,146      
Beginning balance at Dec. 31, 2017 2,348,142   1,253,693 1,094,449 $ 980 $ (3,511) 1,234,846 (112,175) (25,691)
Beginning balance (in shares) at Dec. 31, 2017         98,017,860 157,812      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of Class A common stock under equity incentive award plan         $ 3   (3)    
Issuance of Class A common stock under equity incentive award plan, shares         256,809        
Repurchase of shares for employee tax withholding (381)     (381)   $ (381)      
Repurchase of shares for employee tax withholding, shares           (20,534)      
Stock-based compensation 2,277     2,277     2,277    
Dividends declared (82,766)     (82,766)     (26,301) (56,465)  
Acquisitions 11,113 0 11,113            
Distributions to noncontrolling interests (21,274) $ 0 (21,274)            
Other (209)     (209)     (209)    
Net loss (14,394)   (183,034) 168,640       168,640  
Other comprehensive income (loss), net of tax (8,817)   (1,752) (7,065)         (7,065)
Ending balance at Jun. 30, 2018 $ 2,233,691   $ 1,058,746 $ 1,174,945 $ 983 $ (3,892) $ 1,210,610 $ 0 $ (32,756)
Ending balance (in shares) at Jun. 30, 2018         98,274,669 178,346