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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Costs of Retirement Plans [Table Text Block] |
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﻿ |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended |  | Six Months Ended
﻿ |  | June 30, |  | June 30,
﻿ |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿ |  |  |  |
﻿United States | $ | 445 | $ | 747 | $ | 1,137 | $ | 1,429
﻿Canada |  | 67 |  | 55 |  | 118 |  | 114
﻿United Kingdom |  | 160 |  | 115 |  | 218 |  | 198
﻿ | $ | 672 | $ | 917 | $ | 1,473 | $ | 1,741
﻿
United States Pension Plans of US Entity, Defined Benefit [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs [Table Text Block] |
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﻿ |  | Three Months Ended |  | Six Months Ended
﻿ |  | June 30, |  | June 30,
﻿ |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿ |  |
﻿Service cost | $ | 9 | $ | 9 | $ | 18 | $ | 19
﻿Interest cost |  | 186 |  | 185 |  | 372 |  | 370
﻿Expected return on plan assets |  | (179) |  | (204) |  | (358) |  | (408)
﻿Recognized net actuarial loss |  | 69 |  | 69 |  | 138 |  | 138
﻿Net periodic pension cost | $ | 85 | $ | 59 | $ | 170 | $ | 119
﻿
United Kingdom Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs [Table Text Block] |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended |  | Six Months Ended
﻿ |  | June 30, |  | June 30,
﻿ |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿ |  |
﻿Interest cost | $ | 75 | $ | 77 | $ | 150 | $ | 153
﻿Expected return on plan assets |  | (84) |  | (83) |  | (168) |  | (166)
﻿Amortization of prior service costs and transition amount |  | 5 |  | 5 |  | 10 |  | 10
﻿Recognized net actuarial loss |  | 39 |  | 59 |  | 78 |  | 117
﻿Net periodic pension cost | $ | 35 | $ | 58 | $ | 70 | $ | 114
﻿

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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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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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