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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
COMMON STOCK
CAPITAL SURPLUS
ACCUMULATED OTHER COMPREHENSIVE INCOME
RETAINED EARNINGS
Balance at beginning of period, (in shares) at Dec. 31, 2015   131,156      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net issuances of restricted stock, (in shares)   935      
Repurchases of common stock, (in shares)   (1,955)      
Exercises of stock options, (in shares)   2      
Balance at end of period, (in shares) at Jun. 30, 2016   130,138      
Balance at beginning of period at Dec. 31, 2015   $ 131 $ 979,477 $ (10,294) $ 34,467
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 175,032       175,032
Net issuances of restricted stock   1 (1)    
Repurchases of common stock   (2)     (76,999)
Stock-based compensation expense     22,093    
Exercises of stock options—excess over par value     78    
Tax impact of equity incentive plans     (687)    
Foreign currency translation adjustments, net of tax 3,793     3,793  
Cash dividends ($.48 per share and $.44 per share)         (57,581)
Balance at end of period at Jun. 30, 2016   $ 130 1,000,960 (6,501) 74,919
Balance at beginning of period, (in shares) at Dec. 31, 2016   127,797      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net issuances of restricted stock, (in shares)   829      
Repurchases of common stock, (in shares)   (2,442)      
Exercises of stock options, (in shares)   0      
Balance at end of period, (in shares) at Jun. 30, 2017   126,184      
Balance at beginning of period at Dec. 31, 2016 1,086,599 $ 128 1,022,411 (20,502) 84,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 158,837       158,837
Net issuances of restricted stock   1 (1)    
Repurchases of common stock   (3)     (115,807)
Stock-based compensation expense     20,727    
Exercises of stock options—excess over par value     0    
Tax impact of equity incentive plans     0    
Foreign currency translation adjustments, net of tax 14,996     14,996  
Cash dividends ($.48 per share and $.44 per share)         (60,965)
Balance at end of period at Jun. 30, 2017 $ 1,104,384 $ 126 $ 1,043,137 $ (5,506) $ 66,627