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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)