Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	$ (393)
Other comprehensive income (loss) before reclassifications	(23,088)
Amounts reclassified from AOCI, net of tax	(27)
Net other comprehensive income (loss)	(23,115)
Balance at September 30, 2015	(23,508)
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	29
Amounts reclassified from AOCI, net of tax	(49)	$ (32)
Net other comprehensive income (loss)	(20)
Balance at September 30, 2015	451
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	12,416
Other comprehensive income (loss) before reclassifications	(23,117)
Amounts reclassified from AOCI, net of tax	0
Net other comprehensive income (loss)	(23,117)
Balance at September 30, 2015	(10,701)
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	22	$ (32)
Net other comprehensive income (loss)	22
Balance at September 30, 2015	$ (13,258)