Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 6,227	$ 19,236	$ 22,773	$ 21,402
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	6,793	799	(4,937)	1,133
Actuarial gain (losses) related to defined benefit pension plans	96	(19)	(230)	(38)
Reclassification adjustment from sale of investment	0	0	0	328
Total other comprehensive income (loss)	6,889	780	(5,167)	1,423
Total comprehensive income	$ 13,116	$ 20,016	$ 17,606	$ 22,825