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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 3 months ended Mar. 31, 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 $ (34,417)     (34,417)    
Foreign currency translation adjustment (1,984)       (1,984)  
Exercise of stock options $ 485 $ 1 484      
Exercise of stock options (in shares) 40,000 40,000        
Stock-based compensation $ 9,365   9,365      
Payment of cash dividends (4,443)     (4,443)    
Dividend equivalents (30)     (30)    
Purchase of treasury stock (16,928)         (16,928)
Ending Balance at Mar. 31, 2018 $ 3,934,541 $ 2,663 $ 2,795,672 $ 2,067,007 $ 4,838 $ (935,639)
Ending Balance (in shares) at Mar. 31, 2018 266,298,983 266,299,000