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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Credit facility | $ 121,000 | $ 67,000
Debt: |  |
Total debt | 8,044 | 16,686
Long-term debt | 129,044 |
Less: current portion | (4,192) | (8,626)
Total long-term debt, net | 3,852 | 8,060
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility | $ 121,000 | 67,000
Debt: |  |
Debt, maturity | September 2021 |
Maximum [Member] | Line of Credit [Member] |  |
Debt: |  |
Interest rate | 2.81% |
Minimum [Member] | Line of Credit [Member] |  |
Debt: |  |
Interest rate | 2.62% |
PST Short-Term Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term obligations |  | 5,097
PST Long-Term Notes [Member] |  |
Debt: |  |
Long-term debt | $ 8,016 | 11,452
Debt maturity period range start | 2019 |
Debt maturity period range end | 2021 |
PST Long-Term Notes [Member] | Maximum [Member] |  |
Debt: |  |
Interest rate | 12.24% |
PST Long-Term Notes [Member] | Minimum [Member] |  |
Debt: |  |
Interest rate | 9.00% |
Other [Member] |  |
Debt: |  |
Total debt | $ 28 | $ 137

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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