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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 89,734 $ 67,888 $ 63,531
Other comprehensive income:      
Translation adjustment, net of tax expense of ($222), ($57) and ($63) for 2016, 2015 and 2014, respectively (3,920) (20,939) (24,896)
Unamortized pension adjustments, net of tax benefit of $88, $82, and $67 for 2016, 2015 and 2014, respectively (474) (457) (370)
Comprehensive income $ 85,340 $ 46,492 $ 38,265