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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		$ 436,181	$ 442,937	$ 450,555	$ 442,937
Ending Balance		478,064	429,479	532,527	478,064
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(12,026)	(36,332)	(12,026)
Other comprehensive income (loss) before reclassifications				3,868	(7,864)
Net other comprehensive income (loss)				3,868	(7,864)
Ending Balance		(19,890)		(32,464)	(19,890)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(11,158)	(11,643)	(11,158)
Amounts reclassified from AOCI, net of tax				196	(715)
Net other comprehensive income (loss)				196	(715)
Ending Balance		(11,873)		(11,447)	(11,873)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		(33,719)	(22,568)	(47,975)	(22,568)
Other comprehensive income (loss) before reclassifications				3,868	(7,864)
Amounts reclassified from AOCI, net of tax				196	(715)
Net other comprehensive income (loss)				4,064	(8,579)
Ending Balance		$ (31,763)	(25,848)	$ (43,911)	(31,763)
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Adoption of ASU			(616)		(616)	[1]
Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			$ 616		616
Unrealized Gains on Investments | ASU 2016-01
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Adoption of ASU	[1]				$ (616)
[1] Upon the adoption of ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, we recorded a cumulative-effect adjustment from unrealized gains on investments to beginning retained earnings.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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