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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Class A
Class C
Series A Preferred Stock
Common Stock
Class A
Common Stock
Class C
Preferred Stock
Series A Preferred Stock
Additional Paid-In Capital
Retained Earnings
Total Shareholder's Equity
Non-controlling Interest
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2017         261,338,000 15,661,000          
Balance at beginning of period at Dec. 31, 2017 $ 3,003,972       $ 26 $ 2 $ 0 $ 2,767,558 $ 66,639 $ 2,834,225 $ 169,747
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2017             0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted stock issued (in shares)         199,000            
Restricted stock forfeited (in shares)         (26,000)            
Restricted Stock Award, Forfeitures 0             0   0  
Restricted stock used for tax withholding (in shares)         (10,000)            
Restricted stock used for tax withholding (192)             (192)   (192)  
Option exercises (in shares)         10,000            
Option exercises 164             164   164  
Stock-based compensation 4,333             4,333   4,333  
Conversion of common shares from Class C to Class A, net of tax (in shares)         3,347,000 (3,347,000)          
Conversion of common shares from Class C to Class A, net of tax 6,669       $ 1 $ (1)   42,188   42,188 (35,519)
Net income (loss) 70,772               66,090 66,090 4,682
Common shares outstanding at end of period (in shares) at Mar. 31, 2018         264,858,000 12,314,000          
Balance at end of period at Mar. 31, 2018 3,085,718       $ 27 $ 1 $ 0 2,814,051 132,729 2,946,808 138,910
Preferred shares outstanding at end of period (in shares) at Mar. 31, 2018             0        
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2017         261,338,000 15,661,000          
Balance at beginning of period at Dec. 31, 2017 3,003,972       $ 26 $ 2 $ 0 2,767,558 66,639 2,834,225 169,747
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2017             0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 179,928                    
Common shares outstanding at end of period (in shares) at Sep. 30, 2018         265,771,000 12,003,000          
Balance at end of period at Sep. 30, 2018 3,205,206       $ 27 $ 1 $ 0 2,827,756 235,558 3,063,342 141,864
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2018             0        
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2018         264,858,000 12,314,000          
Balance at beginning of period at Mar. 31, 2018 3,085,718       $ 27 $ 1 $ 0 2,814,051 132,729 2,946,808 138,910
Preferred shares outstanding at beginning of period (in shares) at Mar. 31, 2018             0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted stock issued (in shares)         23,000            
Restricted stock forfeited (in shares)         (17,000)            
Restricted Stock Award, Forfeitures 0             0   0  
Restricted stock used for tax withholding (in shares)         (4,000)            
Restricted stock used for tax withholding (65)             (65)   (65)  
Option exercises (in shares)         28,000            
Option exercises 411             411   411  
Stock-based compensation 4,655             4,655   4,655  
Net income (loss) 67,482               63,541 63,541 3,941
Common shares outstanding at end of period (in shares) at Jun. 30, 2018         264,888,000 12,314,000          
Balance at end of period at Jun. 30, 2018 3,158,201       $ 27 $ 1 $ 0 2,819,052 196,270 3,015,350 142,851
Preferred shares outstanding at end of period (in shares) at Jun. 30, 2018             0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted stock issued (in shares)         697,000            
Restricted stock forfeited (in shares)         (93,000)            
Restricted Stock Award, Forfeitures 0             0   0  
Restricted stock used for tax withholding (in shares)         (46,000)            
Restricted stock used for tax withholding (862)             (862)   (862)  
Option exercises (in shares)         14,000            
Option exercises 272             272   272  
Stock-based compensation 5,341             5,341   5,341  
Conversion of common shares from Class C to Class A, net of tax (in shares)         311,000 (311,000)          
Conversion of common shares from Class C to Class A, net of tax 580       $ 0 $ 0   3,953   3,953 (3,373)
Net income (loss) 41,674               39,288 39,288 2,386
Common shares outstanding at end of period (in shares) at Sep. 30, 2018         265,771,000 12,003,000          
Balance at end of period at Sep. 30, 2018 3,205,206       $ 27 $ 1 $ 0 2,827,756 235,558 3,063,342 141,864
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2018             0        
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018   264,323,328 12,003,183   265,859,000 12,003,000          
Balance at beginning of period at Dec. 31, 2018 3,243,869       $ 27 $ 1 $ 0 2,833,611 266,538 3,100,177 143,692
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2018       1     0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted stock issued (in shares)         436,000            
Restricted stock used for tax withholding (in shares)         (24,000)            
Restricted stock used for tax withholding (291)             (291)   (291)  
Stock-based compensation 6,483             6,483   6,483  
Net income (loss) (8,537)               (8,112) (8,112) (425)
Common shares outstanding at end of period (in shares) at Mar. 31, 2019         266,271,000 12,003,000          
Balance at end of period at Mar. 31, 2019 3,241,524       $ 27 $ 1 $ 0 2,839,803 258,426 3,098,257 143,267
Preferred shares outstanding at end of period (in shares) at Mar. 31, 2019             0        
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018   264,323,328 12,003,183   265,859,000 12,003,000          
Balance at beginning of period at Dec. 31, 2018 $ 3,243,869       $ 27 $ 1 $ 0 2,833,611 266,538 3,100,177 143,692
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2018       1     0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Option exercises (in shares) 0                    
Net income (loss) $ 6,752                    
Common shares outstanding at end of period (in shares) at Sep. 30, 2019   275,556,804 1,143,039   280,444,000 1,143,000          
Balance at end of period at Sep. 30, 2019 3,253,814       $ 28 $ 0 $ 0 2,967,149 272,718 3,239,895 13,919
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2019       1     0        
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2019         266,271,000 12,003,000          
Balance at beginning of period at Mar. 31, 2019 3,241,524       $ 27 $ 1 $ 0 2,839,803 258,426 3,098,257 143,267
Preferred shares outstanding at beginning of period (in shares) at Mar. 31, 2019             0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted stock issued (in shares)         4,000            
Restricted stock forfeited (in shares)         (16,000)            
Restricted Stock Award, Forfeitures 0             0   0  
Restricted stock used for tax withholding (in shares)         (4,000)            
Restricted stock used for tax withholding (41)             (41)   (41)  
Stock-based compensation 6,758             6,758   6,758  
Net income (loss) 19,002               17,877 17,877 1,125
Common shares outstanding at end of period (in shares) at Jun. 30, 2019         266,255,000 12,003,000          
Balance at end of period at Jun. 30, 2019 3,267,243       $ 27 $ 1 $ 0 2,846,520 276,303 3,122,851 144,392
Preferred shares outstanding at end of period (in shares) at Jun. 30, 2019             0        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted stock issued (in shares)         3,466,000            
Restricted stock forfeited (in shares)         (30,000)            
Restricted Stock Award, Forfeitures 0             0   0  
Restricted stock used for tax withholding (in shares)         (107,000)            
Restricted stock used for tax withholding (579)             (579)   (579)  
Stock-based compensation 8,110             8,110   8,110  
Conversion of common shares from Class C to Class A, net of tax (in shares)         10,860,000 (10,860,000)          
Conversion of common shares from Class C to Class A, net of tax (17,247)       $ 1 $ (1)   113,098   113,098 (130,345)
Net income (loss) (3,713)               (3,585) (3,585) (128)
Common shares outstanding at end of period (in shares) at Sep. 30, 2019   275,556,804 1,143,039   280,444,000 1,143,000          
Balance at end of period at Sep. 30, 2019 $ 3,253,814       $ 28 $ 0 $ 0 $ 2,967,149 $ 272,718 $ 3,239,895 $ 13,919
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2019       1     0