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Basis of Presentation and Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Currency translation adjustments $ 6,415 $ 13,148
Net unrealized gain on derivative financial instruments 384 353
Unrecognized prior service cost on benefit obligations (5,452) (6,237)
Net unrealized gain (loss) on available-for-sale investments (99) 2,190
Accumulated other comprehensive income $ 1,248 $ 9,454