Reclassifications from Accumulated Other Comprehensive Income - AOCI Roll Forward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Net cumulative currency translation gains (losses)	Jun. 30, 2013 Net cumulative currency translation gains (losses)	Jun. 30, 2013 Net unrealized losses on qualifying cash flow hedges	Jun. 30, 2013 Net unrealized losses on qualifying cash flow hedges	Jun. 30, 2013 Unrealized gains on available-for-sale investment	Jun. 30, 2013 Unrealized gains on available-for-sale investment	Jun. 30, 2013 Net unrecognized losses related to pension and severance plans		Jun. 30, 2013 Net unrecognized losses related to pension and severance plans		Mar. 31, 2013 Net unrecognized losses related to pension and severance plans	Dec. 31, 2012 Net unrecognized losses related to pension and severance plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (26,768)	$ (40,525)	$ (23,809)	$ 264	$ (125)	$ (1,702)	$ (16,557)	$ 0	$ 404	$ (25,330)	[1]	$ (24,247)	[1]
Other comprehensive income (loss) before reclassifications	(11,189)	(3,002)		(17)	372	(11,187)	(2,125)	0	157	15		(1,406)
Amounts reclassified from accumulated other comprehensive income	4,769	10,339		0	0	4,431	10,224	0	(561)	338		676
Net current-period other comprehensive income	(6,420)	7,337		(17)	372	(6,756)	8,099	0	(404)	353		(730)
Balance at end of period	(33,188)	(33,188)	(23,809)	247	247	(8,458)	(8,458)	0	0	(24,977)	[1]	(24,977)	[1]
Deferred tax liability										$ 153		$ 153		$ 138	$ 283

[1] Net of deferred tax liability of $153, $138 and $283 as of June 30, 2013, March 31, 2013 and December 31, 2012, respectively.