Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan description of nature of event resulting in contractual termination benefits to be recognized in future period			The Company previously disclosed in its Annual Report filed on Form 10-K and 10-K/A for the year ended December 31, 2018 that the Company began the process of terminating the Company’s primary non-contributory U.S. pension plan (the “U.S. Pension Plan”) during the fourth quarter of 2018. As part of this process, and considering the fully funded status of the U.S. Pension Plan, the asset allocation of the U.S. Pension Plan was adjusted modeling a glide path that is more heavily allocated to fixed income securities with lengthened durations to match the projected liabilities. As a result, the expected return on plan assets declined during the three and six months ended June 30, 2019 compared to the three and six months ended June 30, 2018. In order to terminate the U.S. Pension Plan in accordance with Internal Revenue Service and Pension Benefit Guaranty Corporation requirements, the Company will be required to fully fund the U.S. Pension Plan on a termination basis and will commit to contribute additional assets if necessary, to do so. The amount necessary to do so is not yet known but is currently estimated to be between $0 and $10 million. In addition, the Company expects to record a non-cash pension settlement charge at plan termination. This settlement charge will include theimmediate recognition into expense of the related unrecognized losses within AOCI on the balance sheet as of the plan termination date. The Company does not have a current estimate for this future settlement charge, however, the gross AOCI related to the U.S. Pension Plan was approximately $19 million as of June 30, 2019. The Company currently estimates that the U.S. Pension Plan termination will be completed during 2020.
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 978	$ 960	$ 1,963	$ 1,948
Defined Benefit Plan, Interest Cost	1,105	1,032	2,216	2,081
Defined Benefit Plan, Expected Return on Plan Assets	(978)	(1,274)	(1,962)	(2,564)
Defined Benefit Plan, Amortization of Losses	773	793	1,549	1,593
Defined Benefit Plan, Amortization of Prior Service Cost	(41)	(29)	(83)	(60)
Defined Benefit Plan, Net Periodic Benefit Cost	1,837	1,482	3,683	2,998
Defined Benefit Plan, Expected Contributions In Current Fiscal Year					$ 5,200
Defined Benefit Plan, Contributions by Employer			3,300
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	2	3	4	5
Defined Benefit Plan, Interest Cost	36	33	71	66
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Losses	0	14	0	29
Defined Benefit Plan, Amortization of Prior Service Cost	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 38	$ 50	75	$ 100
Defined Benefit Plan, Expected Contributions In Current Fiscal Year					$ 400
Defined Benefit Plan, Contributions by Employer			$ 200