Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014	$ (394)
Other comprehensive income (loss) before reclassifications	(11,458)
Amounts reclassified from AOCI, net of tax	(65)
Net other comprehensive income (loss)	(11,523)
Balance at June 30, 2015	(11,917)
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	168
Amounts reclassified from AOCI, net of tax	(34)	$ (25)
Net other comprehensive income (loss)	134
Balance at June 30, 2015	605
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	(11,626)
Amounts reclassified from AOCI, net of tax	0
Net other comprehensive income (loss)	(11,626)
Balance at June 30, 2015	789
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	(31)	$ 37
Net other comprehensive income (loss)	(31)
Balance at June 30, 2015	$ (13,311)