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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning Balance at Dec. 31, 2017 $ 3,982,493 $ 2,662 $ 2,785,823 $ 2,105,897 $ 6,822 $ (918,711)
Beginning Balance (in shares) at Dec. 31, 2017   266,259,000        
Net loss (321,421)     (321,421)    
Foreign currency translation adjustment (4,335)       (4,335)  
Restricted stock issued for acquisition 2,932 $ 2 2,930      
Restricted stock issued for acquisition (in shares)   192,000        
Issuance of restricted stock   $ 4 (4)      
Issuance of restricted stock (in shares)   381,000        
Vesting of restricted stock units   $ 5 (5)      
Vesting of restricted stock units (in shares)   452,000        
Forfeitures of restricted stock (in shares)   (8,000)        
Exercise of stock options 485   485      
Exercise of stock options (in shares)   40,000        
Stock-based compensation 37,925   37,925      
Payment of cash dividends (30,589)     (30,589)    
Dividend equivalents (330)     (330)    
Purchase of treasury stock (161,737)         (161,737)
Ending Balance at Dec. 31, 2018 3,505,423 $ 2,673 2,827,154 1,753,557 2,487 (1,080,448)
Ending Balance (in shares) at Dec. 31, 2018   267,316,000        
Net loss (425,703)     (425,703)    
Foreign currency translation adjustment 2,991       2,991  
Issuance of restricted stock   $ 2 (2)      
Issuance of restricted stock (in shares)   185,000        
Vesting of restricted stock units   $ 12 (12)      
Vesting of restricted stock units (in shares)   1,173,000        
Forfeitures of restricted stock (in shares)   (2,000)        
Exercise of stock options 9,219 $ 7 9,212      
Exercise of stock options (in shares)   700,000        
Stock-based compensation 39,328   39,328      
Payment of cash dividends (32,428)     (32,428)    
Dividend equivalents (524)     (524)    
Purchase of treasury stock (264,686)         (264,686)
Ending Balance at Dec. 31, 2019 $ 2,833,620 $ 2,694 2,875,680 1,294,902 5,478 (1,345,134)
Ending Balance (in shares) at Dec. 31, 2019 269,372,257 269,372,000        
Net loss $ (803,692)     (803,692)    
Foreign currency translation adjustment (66)       (66)  
Issuance of restricted stock   $ 3 (3)      
Issuance of restricted stock (in shares)   333,000        
Vesting of restricted stock units   $ 13 (13)      
Vesting of restricted stock units (in shares)   1,324,000        
Stock-based compensation 26,572   26,572      
Payment of cash dividends (18,862)     (18,862)    
Dividend equivalents (334)     (334)    
Purchase of treasury stock (21,179)         (21,179)
Ending Balance at Dec. 31, 2020 $ 2,016,059 $ 2,710 $ 2,902,236 $ 472,014 $ 5,412 $ (1,366,313)
Ending Balance (in shares) at Dec. 31, 2020 271,028,688 271,029,000