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Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Noncontrolling Interest
Beginning balance at Dec. 31, 2017 $ 435,576   $ 60 $ 686,660 $ (319,397) $ (303) $ 68,556    
Beginning balance (in shares) at Dec. 31, 2017     49,103   11,505        
Cumulative-effect adjustment from adoption of ASU at Dec. 31, 2017   $ 224,128           $ 224,128  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of subsidiary shares to noncontrolling interest       (179)         $ 179
Net income (loss) (1,763)           (289)   (1,474)
Other comprehensive income (loss), net of tax (25)         (25)      
Cash dividends paid on common stock ($0.80 per share) (39,187)           (39,187)    
Issuance of common stock in connection with exercise of stock options 8,008   $ 1 8,007          
Issuance of common stock in connection with exercise of stock options (in shares)     427            
Issuance of common stock in connection with employee stock purchase plan $ 5,196     5,196          
Issuance of common stock in connection with employee common stock purchase plan (in shares) 306   306            
Issuance of restricted stock, net of shares canceled $ 1   $ 1            
Issuance of restricted stock, net of shares cancelled (in shares)     871            
Repurchases of common stock, shares exchanged (3,429)       $ (3,429)        
Repurchases of common stock, shares exchanged (in shares)     (162)   162        
Repurchases of common stock (41,369)       $ (41,369)        
Repurchases of common stock (in shares)     (2,137)   2,137        
Stock-based compensation expense 31,011     31,011          
Ending balance at Dec. 31, 2018 618,147   $ 62 730,695 $ (364,195) (328) 253,208   (1,295)
Ending balance (in shares) at Dec. 31, 2018     48,408   13,804        
Cumulative-effect adjustment from adoption of ASU at Dec. 31, 2018   $ (2,859)           $ (2,859)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of subsidiary shares to noncontrolling interest       13         (13)
Net income (loss) (64,033)           (62,530)   (1,503)
Other comprehensive income (loss), net of tax 275         275      
Cash dividends paid on common stock ($0.80 per share) (39,502)           (39,502)    
Issuance of common stock in connection with exercise of stock options 694     694          
Issuance of common stock in connection with exercise of stock options (in shares)     42            
Issuance of common stock in connection with employee stock purchase plan $ 5,329   $ 1 5,328          
Issuance of common stock in connection with employee common stock purchase plan (in shares) 386   386            
Issuance of restricted stock, net of shares canceled $ 1   $ 1            
Issuance of restricted stock, net of shares cancelled (in shares)     982            
Repurchases of common stock, shares exchanged (4,506)       $ (4,506)        
Repurchases of common stock, shares exchanged (in shares)     (198)   198        
Stock-based compensation expense 31,554     31,554          
Ending balance at Dec. 31, 2019 545,100   $ 64 768,284 $ (368,701) (53) 148,317   (2,811)
Ending balance (in shares) at Dec. 31, 2019     49,620   14,002        
Cumulative-effect adjustment from adoption of ASU at Dec. 31, 2019 148,317                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of subsidiary shares to noncontrolling interest       (19)         19
Net income (loss) 143,796           146,762   (2,966)
Other comprehensive income (loss), net of tax 1,317         1,317      
Cash dividends paid on common stock ($0.80 per share) (30,829)           (30,829)    
Issuance of common stock in connection with exercise of stock options 89     89          
Issuance of common stock in connection with exercise of stock options (in shares)     7            
Issuance of common stock in connection with employee stock purchase plan $ 4,764     4,764          
Issuance of common stock in connection with employee common stock purchase plan (in shares) 355   355            
Issuance of restricted stock, net of shares canceled $ 2   $ 2            
Issuance of restricted stock, net of shares cancelled (in shares)     2,083            
Repurchases of common stock, shares exchanged (10,508)       $ (10,508)        
Repurchases of common stock, shares exchanged (in shares)     (671)   671        
Repurchases of common stock $ (70,081)       $ (70,081)        
Repurchases of common stock (in shares) (4,900)   (4,919)   4,919        
Common stock issued in merger transaction $ 828,334   $ 58 828,276          
Common stock issued in merger transaction (in shares)     58,300            
Retirement of treasury stock     $ (14) (372,058) $ 372,072        
Retirement of treasury stock (in shares)         (14,185)        
Stock-based compensation expense 39,135     39,135          
Ending balance at Dec. 31, 2020 $ 1,451,119   $ 110 $ 1,268,471 $ (77,218) $ 1,264 $ 264,250   $ (5,758)
Ending balance (in shares) at Dec. 31, 2020     104,775   5,407