Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2013	$ 20,017
Other comprehensive income before reclassifications	(6,711)
Amounts reclassified from AOCI, net of tax	23
Net other comprehensive income (loss)	(6,688)
Balance at March 31, 2014	13,329
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2013	429
Other comprehensive income before reclassifications	22
Amounts reclassified from AOCI, net of tax	(13)	(18)
Net other comprehensive income (loss)	9
Balance at March 31, 2014	438
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2013	30,847
Other comprehensive income before reclassifications	(6,733)
Amounts reclassified from AOCI, net of tax	0
Net other comprehensive income (loss)	(6,733)
Balance at March 31, 2014	24,114
Unrecognized Net Actuarial Loss and Service Credit
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2013	(11,259)
Other comprehensive income before reclassifications	0
Amounts reclassified from AOCI, net of tax	36	41
Net other comprehensive income (loss)	36
Balance at March 31, 2014	$ (11,223)