Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension and Other Postretirement Benefits [Abstract]
Value of Employer Securities Included in Plan Assets		$ 1,300	$ 800
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation		$ 167,100	157,500
Description of Defined Contribution Plan		The Company has a 401(k) plan with an employer match covering a majority of its domestic employees. The plan allows for and the Company has 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		$ 2,700	2,600	$ 2,500
Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation		$ 66,700	66,900
Commingled Fund Asset Allocation		As of December 31, 2016, the U.S. pension plan commingled funds included approximately 61 percent of investments in equity securities and 39 percent of investments in fixed income securities.
Net Periodic Benefit Cost		$ 1,495	1,754	1,076
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation		$ 100,400	90,600
Commingled Fund Asset Allocation		As of December 31, 2016, foreign pension plan commingled funds included approximately 30 percent of investments in diversified equity securities, 60 percent of investments in fixed income securities, and 10 percent of other non-related investments, primarily real estate.
Net Periodic Benefit Cost		$ 3,341	4,325	5,336
Prior Service Cost Charge	$ 900
Effect Of Prior Service Cost Charge Per Diluted Share	$ 0.05
Domestic Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost		152	295	316
Supplemental Retirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost		$ 900	$ 900	$ 800
Company Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of domestic pension assets		3.00%	2.00%