Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	$ (394)
Other comprehensive income (loss) before reclassifications	(17,402)
Amounts reclassified from AOCI, net of tax	(131)
Net other comprehensive income (loss)	(17,533)
Balance at March 31, 2015	(17,927)
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	471
Other comprehensive income (loss) before reclassifications	177
Amounts reclassified from AOCI, net of tax	(17)	(13)
Net other comprehensive income (loss)	160
Balance at March 31, 2015	631
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	12,415
Other comprehensive income (loss) before reclassifications	(17,579)
Amounts reclassified from AOCI, net of tax	0
Net other comprehensive income (loss)	(17,579)
Balance at March 31, 2015	(5,164)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	(13,280)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from AOCI, net of tax	(114)	36
Net other comprehensive income (loss)	(114)
Balance at March 31, 2015	$ (13,394)