Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 97,147	$ 80,296	$ 7,887
Other comprehensive loss, net of tax
Foreign currency translation adjustments	(7,352)	(44,569)	(26,948)
Unrealized gain (loss) on available-for-sale investments	0	611	(1,884)
Reclassification adjustment associated with unrealized loss realized upon the write-down of available-for-sale investments	0	0	1,884
Reclassification adjustment associated with the sale of available-for-sale investments	(611)	0	0
Pension liability adjustments, net of income tax expense (benefit) of $82, ($45), and ($71) for year ended December 31, 2016, 2015, and 2014	462	(142)	(150)
Other comprehensive loss	(7,501)	(44,100)	(27,098)
Comprehensive income (loss)	$ 89,646	$ 36,196	$ (19,211)