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Debt Asset-Based Revolving Credit Facility (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Term Loan Due 2022 [Member] | Medium-term notes [Member]
ABL Term Loan [Abstract]
Term Loan, Face Amount	$ 50,000
Term Loan, Average Interest Rate During Period	2.65%
Term Loan, Average Interest Rate During Period With Patronage Credits	1.90%
Term Loan Due 2022 [Member] | Medium-term notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.75%
Term Loan Due 2022 [Member] | Medium-term notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	2.25%
Term Loan Due 2022 [Member] | Medium-term notes [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.75%
Term Loan Due 2022 [Member] | Medium-term notes [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.25%
Asset-based revolving credit facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 370,000
Fixed charge coverage ratio requirement, if availability falls below 10% of aggregate lending commitments (as a percent)	100.00%
Threshold of availability as a percentage of aggregate lending commitments, below which 1:1 fixed charge coverage ratio must be met	10.00%
Threshold of availability, below which 1:1 fixed charge coverage ratio must be met	$ 37,000
Current availability	$ 363,700
Dividend restriction, single threshold, percentage of aggregate Revolver Commitments	25.00%
Dividend restriction, combination thresholds, percentage of aggregate Revolver Commitments	15.00%
Dividend restriction, combination thresholds, fixed-charge coverage ratio (as a percent)	100.00%
Amount outstanding	$ 0	$ 0
Letters of credit outstanding	6,200	$ 5,900
Revolving Credit Facility, Minimum Amount Outstanding During Period	0
Revolving Credit Facility, Maximum Amount Outstanding During Period	$ 89,200
Revolving Credit Facility, Average Interest Rate During Period	2.21%
Asset-based revolving credit facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee rate	0.25%
Asset-based revolving credit facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee rate	0.375%
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.25%
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.75%
Asset-based revolving credit facility [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.25%
Asset-based revolving credit facility [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.75%

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- Definition

The average effective interest rate during the reporting period, which includes the expected patronage credits.

+ References

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- Definition

Under the combination thresholds, minimum pro forma fixed charge coverage ratio. If that percentage is met and the 15% pro forma excess availability as a percentage of aggregate revolver commitments is also met, there is no restriction upon the payment of dividends.

+ References

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- Definition

Under the combination thresholds, minimum pro forma excess availability as a percentage of aggregate revolver commitments. If that percentage is met and the 1:1 pro forma fixed charge coverage ratio is also met, there is no restriction upon the payment of dividends.

+ References

No definition available.

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- Definition

The single threshold of pro forma excess availability as a percentage of aggregate revolver commitments, below which dividends cannot be paid, unless the alternative combination thresholds are met.

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- Definition

The percentage minimum fixed charge coverage ratio that must be met if the availability falls below 10% of the aggregate lending commitments.

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- Definition

Minimum amount borrowed under the credit facility at any time during the period.

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- Definition

Threshold of availability as a percentage of aggregate lending commitments, below which a minimum 1:1 fixed charge ratio is required.

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- Definition

The amount of the threshold of availability, representing 10% of aggregate lending commitments, below which a minimum 1:1 fixed charge ratio is required.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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The average effective interest rate during the reporting period.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

The effective interest rate during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum amount borrowed under the credit facility at any time during the period.

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No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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