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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Class A Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Class A Common 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)    
Purchase of treasury stock (50,524)         $ (50,524) $ (50,500)  
Purchase of treasury stock, shares           (751,920)    
Stock-based compensation expense 31,260   31,260          
Vesting of restricted stock units and exercise of stock options 1,032   (21,870)     $ 22,902    
Vesting of restricted stock units and exercise of stock options, shares           411,752 411,752  
Common stock dividends declared (68,629)     (68,629)        
Noncontrolling interest from a business combination 6,500             6,500
Contribution from a noncontrolling interest 226             226
Change in pension and other postretirement benefit obligations, net of tax (20,456)       (20,456)      
Net income (loss) 388,265     389,477       (1,212)
Balance at Dec. 31, 2018 1,868,984 $ 473 1,351,931 620,371 (14,316) $ (105,685)   16,210
Balance, Shares at Dec. 31, 2018   47,291,463            
Balance, Shares at Dec. 31, 2018           (1,665,217)    
Purchase of treasury stock (45,115)         $ (45,115) $ (45,100)  
Purchase of treasury stock, shares           (439,743)    
Stock-based compensation expense 38,620   38,620          
Vesting of restricted stock units and exercise of stock options (7,410)   (36,822)     $ 29,412    
Vesting of restricted stock units and exercise of stock options, shares           563,285 563,285  
Common stock dividends declared (82,823)     (82,823)        
Noncontrolling interest from a business combination 6,201             6,201
Purchase of noncontrolling interest from a consolidated variable interest entity and Payments resulting from common control transactions (Note 3) (6,500)             (6,500)
Deconsolidation of a variable interest entity 11,026     11,026        
Contribution from a noncontrolling interest 49             49
Change in pension and other postretirement benefit obligations, net of tax 34,166       34,166      
Net income (loss) 236,295     230,259       6,036
Balance at Dec. 31, 2019 $ 2,053,493 $ 473 1,353,729 778,833 19,850 $ (121,388)   21,996
Balance, Shares at Dec. 31, 2019   47,291,463            
Balance, Shares at Dec. 31, 2019 (1,541,675)         (1,541,675)    
Purchase of treasury stock $ (281,897)         $ (281,897) $ (281,800)  
Purchase of treasury stock, shares           (3,085,745)    
Stock-based compensation expense 48,274   48,274          
Vesting of restricted stock units and exercise of stock options (1,960)   (38,113)     $ 36,153    
Vesting of restricted stock units and exercise of stock options, shares           592,785 592,785  
Common stock dividends declared (101,038)     (101,038)        
Change in reporting entity resulting from common control transactions (Note 3)       935       (935)
Purchase of noncontrolling interest from a consolidated variable interest entity and Payments resulting from common control transactions (Note 3) (2,131)     (2,131)        
Contribution from a noncontrolling interest 804             804
Disposal of an entity (1,340)   (1,380) (9) 49      
Change in pension and other postretirement benefit obligations, net of tax 14,611       14,611      
Net income (loss) 808,060     811,441       (3,381)
Balance at Dec. 31, 2020 $ 2,536,876 $ 473 $ 1,362,510 $ 1,488,031 $ 34,510 $ (367,132)   $ 18,484
Balance, Shares at Dec. 31, 2020   47,291,463            
Balance, Shares at Dec. 31, 2020 (4,034,635)         (4,034,635)