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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Class A Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Class A Common Stock [Member]
Noncontrolling interests [Member]
Balance at Dec. 31, 2014 $ 56,537 $ 312 $ 398,029 $ (345,804)       $ 4,000
Balance, Shares at Dec. 31, 2014   31,172,060            
Stock-based compensation expense 11,400   11,400          
Purchase of treasury stock (48,660)         $ (48,660) $ (48,700)  
Purchase of treasury stock, shares           (1,010,565)    
Vesting of restricted stock units and exercise of stock options 3,357 $ 4 2,439     $ 914    
Vesting of restricted stock units and exercise of stock options, shares   449,309       17,000 17,000  
Excess tax benefit from stock option exercises and vested restricted stock units 8,042   8,042          
Common stock dividends declared (23,686)   (23,686)          
Consolidation of variable interest entities 2,900             2,900
Contribution from noncontrolling interest 100             100
Net income 76,383     77,684       (1,301)
Balance at Dec. 31, 2015 86,373 $ 316 396,224 (268,120)   $ (47,746)   5,699
Balance, Shares at Dec. 31, 2015   31,621,369            
Balance, Shares at Dec. 31, 2015           (993,565)    
Stock-based compensation expense 11,390   11,390          
Vesting of restricted stock units and exercise of stock options 1,225   (5,008)     $ 6,233    
Vesting of restricted stock units and exercise of stock options, shares           116,821 116,821  
Excess tax benefit from stock option exercises and vested restricted stock units 13,760   13,760          
Common stock dividends declared (29,445)   (29,445)          
Purchase of noncontrolling interests from variable interest entities (100)             (100)
Consolidation of variable interest entities 108,694             108,694
Distribution to a noncontrolling interests (643)             (643)
Net income 93,100     91,537       1,563
Balance at Dec. 31, 2016 $ 284,354 $ 316 386,921 (176,583)   $ (41,513)   115,213
Balance, Shares at Dec. 31, 2016   31,621,369            
Balance, Shares at Dec. 31, 2016 (876,744)         (876,744)    
Issuance/reissuance of stock in connection with the Merger $ 1,031,443 $ 157 1,007,956     $ 23,330    
Issuance/reissuance of stock in connection with the Merger, shares   15,670,094       560,316    
Stock option replacement awards in connection with the Merger 10,702   10,702          
Stock-based compensation expense 24,068   24,068          
Purchase of treasury stock (99,008)         $ (99,008) $ (99,000)  
Purchase of treasury stock, shares           (1,689,132)    
Vesting of restricted stock units and exercise of stock options 7,914   (31,214)     $ 39,128    
Vesting of restricted stock units and exercise of stock options, shares           680,511 680,511  
Common stock dividends declared (55,892)   (55,892)          
Purchase of noncontrolling interests from variable interest entities (108,694)             (108,694)
Consolidation of variable interest entities 7,600             7,600
Deconsolidation of a variable interest entity (3,655)     345       (4,000)
Contribution from noncontrolling interest 659             659
Distribution to a noncontrolling interests (412)             (412)
Change in pension and postretirement, net of tax 6,140       $ 6,140      
Net income 475,327     474,997       330
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)    
Adjustment to adopt ASU 2016-16 | ASU 2016-16 [Member] $ 764     $ 764