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Retirement Plans (Defined Contribution Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Plan -URI http://asc.fasb.org/extlink&oid=49180617 + Details
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