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Retirement Plans (Defined Contribution Plans) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Defined Contribution Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | $ 799 | $ 824
UNITED STATES |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | 691 | 682
CANADA |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | 50 | 59
UNITED KINGDOM |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | $ 58 | $ 83

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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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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Details
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- Details
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- Details
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