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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Revolving credit facility	$ 103,500	$ 96,000
Debt:
Total debt	1,601	2,516
Less: current portion	(869)	(1,533)
Total long-term debt, net	732	983
Line of Credit [Member]
Debt Instrument [Line Items]
Revolving credit facility	0	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 103,500	96,000
Debt:
Debt, maturity	June 2024
Maximum [Member] | Revolving Credit Facility [Member]
Debt:
Long-term debt, weighted average interest rate	3.45%
Minimum [Member] | Revolving Credit Facility [Member]
Debt:
Long-term debt, weighted average interest rate	3.28%
PST Short-Term Obligations [Member]
Debt Instrument [Line Items]
Short-term debt	$ 322	989
Debt:
Debt, maturity	December 2019
Interest rate	6.00%
PST Long-Term Notes [Member]
Debt:
Long-term debt	$ 1,279	$ 1,527
Debt, maturity	November 2021
Interest rate	7.00%

X

- Definition

Amount of short-term and long-term debt and lease obligation.

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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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