Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 126,633	$ 92,617	$ 89,734
Other comprehensive income:
Translation adjustment, net of tax expense of $0, $0 and ($222) for 2018, 2017 and 2016, respectively	(12,911)	21,418	(3,920)
Unamortized pension adjustments, net of tax benefit (expense) of ($59), $37 and $88, for 2018, 2017 and 2016, respectively	376	(944)	(474)
Comprehensive income	$ 114,098	$ 113,091	$ 85,340