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Employee Retirement Benefits (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum matching percentage by employer | 6.00% |  |
Contributions to the plan | $ 591,000 | $ 528,000 | $ 457,000
Expected contributions in 2016 | 70,000 |  |
Settlement contribution amount | $ 650,000 |  |
Percentage of settlement contributed | 95.00% |  |
Pension settlement costs | $ 1,222,276 |  |
Number of active employees covered by U.K. based subsidiary Austin Taylor | employee | 2 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments used to fund the plan | $ 2,623,000 | $ 3,756,000 |

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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