Retirement Plans (Defined Contribution Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]
Description of Defined Contribution Pension and Other Postretirement Plans	The Company sponsors eight defined contribution plans for hourly and salaried employees across our domestic and international facilities. The following table summarizes the expense associated with the contributions made to these plans.
Defined Contribution Plan, Cost Recognized	$ 2,414	$ 3,154	$ 2,810
UNITED STATES
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	1,813	2,434	2,425
UNITED KINGDOM
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	376	494	158
Montreal Benefit Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 225	$ 226	$ 227