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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2018 - 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 266,259,083 266,259,000        
Net loss $ (120,172)     (120,172)    
Foreign currency translation adjustment (1,994)       (1,994)  
Exercise of stock options $ 485 $ 1 484      
Exercise of stock options (in shares) 40,000 40,000        
Issuance of common stock   $ 4 (4)      
Issuance of common stock (in shares)   381,000        
Vesting of restricted stock units   $ 4 (4)      
Vesting of restricted stock units (in shares)   416,000        
Forfeitures of restricted stock (in shares)   (6,000)        
Stock-based compensation $ 28,449   28,449      
Payment of cash dividends (21,960)     (21,960)    
Dividend equivalents (219)     (219)    
Purchase of treasury stock (111,655)         (111,655)
Ending Balance at Sep. 30, 2018 $ 3,755,427 $ 2,671 $ 2,814,748 $ 1,963,546 $ 4,828 $ (1,030,366)
Ending Balance (in shares) at Sep. 30, 2018 267,089,563 267,090,000