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Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Beginning Balance $ 370,638
Ending Balance 413,721
Unrealized Gains on Investments  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Beginning Balance 421
Other comprehensive income before reclassifications 124
Amounts reclassified from AOCI, net of tax (29)
Net other comprehensive income 95
Ending Balance 516
Cumulative Foreign Currency Translation Adjustments  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Beginning Balance (29,084)
Other comprehensive income before reclassifications 9,705
Net other comprehensive income 9,705
Ending Balance (19,379)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Beginning Balance (10,728)
Amounts reclassified from AOCI, net of tax 148
Net other comprehensive income 148
Ending Balance (10,580)
Accumulated Other Comprehensive Income (Loss)  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Beginning Balance (39,391)
Other comprehensive income before reclassifications 9,829
Amounts reclassified from AOCI, net of tax 119
Net other comprehensive income 9,948
Ending Balance $ (29,443)