Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Term of Insurance Contracts to Fund Benefits	5 years
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 200	$ 300
Deferred Compensation Arrangement with Individual, Compensation Expense	1,200	1,700	$ 1,900
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ (81)	$ (85)	7
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	1.90%	2.60%
Defined Benefit Plan, Benefit Obligation	$ 56,082	$ 50,759	59,338
Defined Benefit Plan, Service Cost	1,456	1,787	1,445
Defined Benefit Plan, Interest Cost	1,329	1,192	1,756
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	0	0	(1,024)
Defined Benefit Plan, Benefits Paid	(1,139)	(982)
defined benefit plan, Administrative Expenses	(31)	(169)
Defined Benefit Plan, Actuarial Net (Gains) Losses	5,225	(4,416)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	(1,517)	(5,991)
Defined Benefit Plan, Future Amortization of Gain (Loss)	(400)
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	0	(96)	(87)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(1,258)	(4,811)
Defined Benefit Plan, Fair Value of Plan Assets	46,134	41,116	$ 47,528
Defined Benefit Plan, Actual Return on Plan Assets	6,328	(2,279)
Defined Benefit Plan, Contributions by Employer	1,118	1,829
Defined Benefit Plan, Funded Status of Plan	(9,948)	(9,643)
Defined Benefit Plan, Accumulated Benefit Obligation	47,980	43,969
Interest Rate Swap [Domain]
Defined Benefit Plan Disclosure [Line Items]
Interest Rate Derivatives, at Fair Value, Net	$ (659)	$ (998)