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Retirement Plans (Defined Contribution Plans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | $ 675 | $ 578
Salaried Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | 556 | 449
Union Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | 17 | 16
Montreal Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | 25 | 35
United Kingdom Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | 38 | 33
Burnaby Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Cost Recognized | $ 39 | $ 45

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=6414718&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration