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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Credit facility	$ 121,000	$ 67,000
Debt:
Total debt	8,044	16,686
Long-term debt	129,044
Less: current portion	(4,192)	(8,626)
Total long-term debt, net	3,852	8,060
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility	$ 121,000	67,000
Debt:
Debt, maturity	September 2021
Maximum [Member] | Line of Credit [Member]
Debt:
Interest rate	2.81%
Minimum [Member] | Line of Credit [Member]
Debt:
Interest rate	2.62%
PST Short-Term Obligations [Member]
Debt Instrument [Line Items]
Short-term obligations		5,097
PST Long-Term Notes [Member]
Debt:
Long-term debt	$ 8,016	11,452
Debt maturity period range start	2019
Debt maturity period range end	2021
PST Long-Term Notes [Member] | Maximum [Member]
Debt:
Interest rate	12.24%
PST Long-Term Notes [Member] | Minimum [Member]
Debt:
Interest rate	9.00%
Other [Member]
Debt:
Total debt	$ 28	$ 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.

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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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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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