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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Oct. 04, 2010
Debt Instrument [Line Items]
Revolving credit facility [Member]	$ 141,000	$ 67,000
Debt:
Total debt	14,226	16,686
Less: current portion	(6,885)	(8,626)
Total long-term debt, net	7,341	8,060
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility [Member]	$ 141,000	67,000
Debt:
Debt, maturity	September 2021
Maximum [Member] | Revolving Credit Facility [Member]
Debt:
Interest rate	2.23%
Minimum [Member] | Revolving Credit Facility [Member]
Debt:
Interest rate	2.04%
Senior Notes [Member]
Debt:
Debt interest rate			9.50%
PST Short-Term Notes [Member]
Debt Instrument [Line Items]
Short-term debt [Member]	$ 2,996	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	4.27%
PST Long-Term Notes [Member]
Debt:
Total long-term debt, net	$ 11,127	11,452
Debt maturity period range start	2018
Debt maturity period range end	2021
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate	17.38%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate	7.50%
Other [Member]
Debt:
Total debt	$ 103	$ 137

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

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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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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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