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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2014
Debt Instrument [Line Items]
Revolving credit facility	$ 96,000	$ 121,000
Debt:
Long-term debt	98,516
Total debt	2,516	8,044
Less: current portion	(1,533)	(4,192)
Total long-term debt, net	983	3,852
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 96,000	121,000
Debt:
Debt, maturity	September 2021
Maximum [Member] | Line of Credit [Member]
Debt:
Interest rate	3.58%
Minimum [Member] | Line of Credit [Member]
Debt:
Interest rate	3.40%
Senior Notes [Member]
Debt:
Debt interest rate			9.50%
PST Short-Term Obligations [Member]
Debt Instrument [Line Items]
Short-term debt	$ 989
Debt:
Debt, maturity	2019
PST Short-Term Obligations [Member] | Maximum [Member]
Debt:
Interest rate	11.27%
PST Short-Term Obligations [Member] | Minimum [Member]
Debt:
Interest rate	10.00%
PST Long-Term Notes [Member]
Debt:
Long-term debt	$ 1,527	8,016
Debt, maturity	November 2021
Interest rate	8.00%
Other [Member]
Debt:
Total debt		$ 28

X

- 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

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-Publisher FASB
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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. 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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