Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension and Other Postretirement Benefits [Abstract]
Value of Employer Securities Included in Plan Assets	$ 0	$ 1,500
Defined Benefit Plan Disclosure [Line Items]
Description of Defined Contribution Plan	The Company has a 401(k) plan with an employer match covering a majority of its U.S. employees. The plan allows for and the Company previously paid a nonelective contribution on behalf of participants who have completed one year of service equal to 3% of the eligible participants’ compensation in the form of Company common stock.
Non-elective Match Percentage	3.00%
Total Contribution Amount	$ 3,100	$ 2,900	$ 2,700
Defined Benefit Plan Explanation Of Significant Change In Benefit Obligation Or Plan Assets Not Apparent From Other Required Disclosures	During the second quarter of 2017, the Company’s primary noncontributory U.S. pension plan (the “U.S. Pension Plan”) offered a cash settlement to its vested terminated participants, which allowed them to receive the value of their pension benefits as a single lump sum payment. As payments from the U.S. Pension Plan for this cash out offering exceeded the service and interest cost components of the U.S. Pension Plan expense for the year ended December 31, 2017, the Company recorded a settlement charge of approximately $1.9 million. This settlement charge represented the immediate recognition into expense of a portion of the unrecognized loss within AOCI on the balance sheet in proportion to the share of the projected benefit obligation that was settled by these payments. The gross pension benefit obligation was reduced by approximately $4.0 million as a result of these payments.	Pension and postretirement benefit costs, non-service components during the year ended December 31, 2017 includes a $1.9 million pension settlement charge.
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 165,300	$ 176,300
Domestic [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 57,600	$ 62,200
Reclassification Percentage	0.00%	3.00%
Net Periodic Benefit Cost	$ 1,762	$ 3,607	1,495
Defined Benefit Plan Description Of Nature Of Event Resulting In Contractual Termination Benefits To Be Recognized In Future Period	In the fourth quarter of 2018, the Company began the process of terminating the U.S. Pension Plan after receiving Board of Director approval to do so. Prior to December 31, 2005, the U.S. Pension Plan covered substantially all employees of the Company’s U.S. subsidiary who had at least one year of eligible service and had attained age 21. Effective December 31, 2005, the U.S. Pension Plan was amended to freeze benefit accruals with respect to participants who were not part of a collective bargaining unit and effective after November 30, 2013, the U.S. Pension Plan was further amended to freeze benefit accruals for the remaining members of a collective bargaining unit. U.S. Pension Plan participants will have their benefits either converted into a lump sum cash payment or an annuity contract placed with an insurance carrier. The U.S. Pension Plan is fully-funded on a U.S. GAAP basis. In order to terminate the plan in accordance with IRS and pension benefit guaranty corporation requirements, the Company will be required to fully fund the plan on a termination basis and will commit to contribute the additional assets necessary, if any, 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 pension settlement charge at plan termination. This settlement charge will include the immediate recognition into expense of the 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 this plan was approximately $19 million as of December 31, 2018. The Company currently estimates that the U.S. Pension Plan termination will be completed during 2020.
Domestic [Member] | Pension Plans, Defined Benefit [Member] | Defined Benefit Plan Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	10.00%
Domestic [Member] | Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	90.00%
Domestic [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost	$ 179	206	152
Domestic [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost	1,600	1,400	900
Foreign [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	107,700	114,100
Net Periodic Benefit Cost	$ 4,160	$ 3,986	$ 3,341
Foreign [Member] | Pension Plans, Defined Benefit [Member] | Defined Benefit Plan Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	30.00%
Foreign [Member] | Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	60.00%
Foreign [Member] | Pension Plans, Defined Benefit [Member] | Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	10.00%