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

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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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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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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