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]
Common Class A [Member]
Parent Company [Member]
Common Stock [Member]
Beginning Balance at Dec. 31, 2015 $ 1,775,762   $ 944,262 $ 831,500 $ 747 $ (1,577) $ 982,814 $ (77,159) $ (73,325)  
Balance, shares at Dec. 31, 2015         74,709,442 (65,301)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Stock issued (shares)                   12,540,504
Stock Issued During Period, Value, New Issues       286,240     286,115     $ 125
Issuance of Class A common stock under equity incentive award plan 0       $ 3   (3)      
Issuance of Class A common stock under equity incentive award plan, shares         287,904          
Repurchase of shares for employee tax withholding (64)     (64)   $ (64)        
Repurchase of shares for employee tax withholding, shares           (3,043)        
Stock-based compensation 4,362     4,362     4,362      
Dividends declared (92,818)     (92,818)     (92,818)      
Distributions to noncontrolling interests (11,771) $ 0 (11,771)              
Other (61)   (103) 42     42      
Net loss (55,744)   (24,838) (30,906)       (30,906)    
Other comprehensive loss, net of tax (21,689)   (865) (20,824)         (20,824)  
Ending Balance at Sep. 30, 2016 1,884,217   906,685 977,532 $ 875 $ (1,641) 1,180,512 (108,065) (94,149)  
Balance, shares at Sep. 30, 2016         87,537,850 (68,344)        
Beginning Balance at Dec. 31, 2016 1,878,744   891,246 987,498 $ 875 $ (2,500) 1,145,760 (94,270) (62,367)  
Balance, shares at Dec. 31, 2016         87,521,651 (110,964)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Stock issued (shares)                   931,561
Stock Issued During Period, Value, New Issues 22,509     22,509 $ 9   22,500      
Issuance of Class A common stock under equity incentive award plan 0       $ 2   (2)      
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 4,085     4,085     4,085      
Dividends declared (110,168)     (110,168)     (110,168)      
Noncontrolling Interest, Increase from Business Combination 390,389 0 390,389              
Distributions to noncontrolling interests (13,701) $ 0 (13,701)              
Other (124)   (201) 77     77      
Net loss (60,521)   (50,566) (9,955)       (9,955)    
Other comprehensive loss, net of tax 37,728   182 37,546         37,546  
Ending Balance at Sep. 30, 2017 $ 2,148,844   $ 1,217,349 $ 931,495 $ 886 $ (2,597) $ 1,062,252 $ (104,225) $ (24,821)  
Balance, shares at Sep. 30, 2017         88,684,523 (115,146)