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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - 6 months ended Jun. 30, 2018 - USD ($)
$ in Thousands
Total
Class A Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Noncontrolling interests [Member]
Balance at Dec. 31, 2017 $ 1,581,310 $ 473 $ 1,342,541 $ 299,523 $ 6,140 $ (78,063) $ 10,696
Balance, Shares at Dec. 31, 2017   47,291,463          
Balance, Shares at Dec. 31, 2017 (1,325,049)         (1,325,049)  
Purchase of treasury stock $ (50,524) $ (50,500)       $ (50,524)  
Purchase of treasury stock, shares   (751,920)       (751,920)  
Stock-based compensation expense 14,595   14,595        
Vesting of restricted stock units and exercise of stock options (2,657)   (19,398)     $ 16,741  
Vesting of restricted stock units and exercise of stock options           307,541  
Common stock dividends declared (34,443)     (34,443)      
Contribution from a noncontrolling interest 226           226
Net income (loss) 133,947     135,854     (1,907)
Balance at Jun. 30, 2018 $ 1,642,454 $ 473 $ 1,337,738 $ 400,934 $ 6,140 $ (111,846) $ 9,015
Balance, Shares at Jun. 30, 2018   47,291,463          
Balance, Shares at Jun. 30, 2018 (1,769,428)         (1,769,428)