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Employee Retirement Plans (Schedule of Defined Benefit Plan, Amounts Recognized in Consolidated Financial Statements) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plan [Abstract] |  |
Accrued pension liability: Current portion | $ 327 | $ 360
Accrued pension liability: Long term portion | 743 | 1,016
Pre-tax accumulated other comprehensive income – retirement benefit liability adjustment | 171 | 197
Net amount recognized | $ 1,241 | $ 1,573

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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