XML 18 R7.htm IDEA: XBRL DOCUMENT v3.8.0.1
Consolidated Statements of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2017 $ 985,951 $ 523 $ (100,694) $ 232,670 $ (724) $ 854,176
Beginning Balance, Shares at Dec. 31, 2017   52,277 4,152      
Comprehensive income 73,879       198 73,681
Common stock purchased for treasury (508)   $ (508)      
Common stock purchased for treasury, shares     5      
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     3      
Share-based compensation (8,055) $ 2 $ (11,524) 3,467    
Share-based compensation, Shares   160 119      
Exercise of stock options $ 919     919    
Exercise of stock options, Shares 59 59        
Ending Balance at Mar. 31, 2018 $ 1,051,012 $ 525 $ (112,726) $ 237,056 $ (526) 926,683
Ending Balance, Shares at Mar. 31, 2018   52,496 4,279      
Cumulative effect from the adoption of accounting pronouncements, net of taxes $ (1,174)         $ (1,174)