Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,236	$ 12,976	$ 21,402	$ (34,691)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	799	730	1,133	(6,952)
Actuarial losses related to defined benefit pension plans	(19)	(16)	(38)	(31)
Unrealized gain (losses) on investment arising during period	0	243	0	(96)
Reclassification adjustment from sale of investment	0	0	328	0
Total other comprehensive income (loss)	780	957	1,423	(7,079)
Total comprehensive income (loss)	$ 20,016	$ 13,933	$ 22,825	$ (41,770)