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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 60,082 | $ 70,090
Less current maturities | 82 | 73
Total long-term debt | 60,000 | 70,017
Capital lease obligations |  |
Debt Instrument [Line Items] |  |
Total debt | 0 | 0
Other notes payable |  |
Debt Instrument [Line Items] |  |
Total debt | 82 | 90
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Total debt | $ 60,000 | $ 70,000

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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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