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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Oct. 04, 2010
Debt Instrument [Line Items] |  |  |
Revolving credit facility | $ 132,000 | $ 67,000 |
Debt: |  |  |
Total debt | 12,430 | 16,686 |
Less: current portion | (6,524) | (8,626) |
Total long-term debt, net | 5,906 | 8,060 |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility | $ 132,000 | 67,000 |
Debt: |  |  |
Debt, maturity | September 2021 |  |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |
Debt: |  |  |
Interest rate | 2.66% |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |
Debt: |  |  |
Interest rate | 2.51% |  |
Senior Notes [Member] |  |  |
Debt: |  |  |
Debt interest rate |  |  | 9.50%
PST Short-Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt [Member] | $ 2,094 | 5,097 |
Debt: |  |  |
Debt maturity period range start | 2017 |  |
Debt maturity period range end | 2018 |  |
PST Short-Term Notes [Member] | Maximum [Member] |  |  |
Debt: |  |  |
Interest rate | 8.00% |  |
PST Short-Term Notes [Member] | Minimum [Member] |  |  |
Debt: |  |  |
Interest rate | 5.44% |  |
PST Long-Term Notes [Member] |  |  |
Debt: |  |  |
Total long-term debt, net | $ 10,275 | 11,452 |
Debt maturity period range start | 2018 |  |
Debt maturity period range end | 2021 |  |
PST Long-Term Notes [Member] | Maximum [Member] |  |  |
Debt: |  |  |
Interest rate | 15.40% |  |
PST Long-Term Notes [Member] | Minimum [Member] |  |  |
Debt: |  |  |
Interest rate | 9.50% |  |
Other [Member] |  |  |
Debt: |  |  |
Total debt | $ 61 | $ 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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