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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Oct. 15, 2014	Oct. 04, 2010
Debt Instrument [Line Items]
Credit facility	$ 67,000	$ 100,000	$ 100,000
Debt:
Total debt	16,686	18,363
Long-term debt	83,686
Less: current portion	(8,626)	(13,905)
Total long-term debt, net	8,060	4,458
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility	$ 67,000	100,000
Debt:
Debt interest rate	2.00%
Debt, maturity	September 2021
Senior Notes [Member]
Debt:
Debt interest rate				9.50%
PST Short-Term Obligations [Member]
Debt Instrument [Line Items]
Short-term obligations	$ 5,097	11,556
Debt:
Debt, maturity	2017
PST Short-Term Obligations [Member] | Maximum [Member]
Debt:
Interest rate maximum	20.33%
PST Short-Term Obligations [Member] | Minimum [Member]
Debt:
Interest rate minimum	4.27%
PST Long-Term Notes [Member]
Debt:
Long-term debt	$ 11,452	6,428
Debt maturity period range start	2017
Debt maturity period range end	2021
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate maximum	19.00%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate minimum	7.50%
Other [Member]
Debt:
Total debt	$ 137	$ 379

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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.

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