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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Revolving credit facility	$ 101,000	$ 121,000
Debt:
Total debt	3,026	8,044
Less: current portion	(1,808)	(4,192)
Total long-term debt, net	1,218	3,852
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 101,000	121,000
Debt:
Debt, maturity	September 2021
Maximum [Member] | Revolving Credit Facility [Member]
Debt:
Interest rate	3.30%
Minimum [Member] | Revolving Credit Facility [Member]
Debt:
Interest rate	3.16%
PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt	$ 675
Debt:
Debt, maturity	March 2019
Interest rate	11.26%
PST Long-Term Notes [Member]
Debt:
Total long-term debt, net	$ 2,351	8,016
Debt maturity period range start	2019
Debt maturity period range end	2021
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate	10.00%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate	8.00%
Other [Member]
Debt:
Total debt	$ 0	$ 28

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- Definition

Latest period the outstanding debt instruments are required to be repaid.

+ References

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Earliest period the outstanding debt instruments are required to be repaid.

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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)
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Fair value of the amount outstanding under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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