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Debt:Asset-Based Credit Facility (Details) - USD ($)	5 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	May 15, 2015
AssetBasedCreditFacility [Member]
Line of Credit Facility [Line Items]
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%	10.00%
Threshold of availability, below which 1:1 fixed charge coverage ratio must be met	$ 37,000,000	$ 37,000,000
Current availability	$ 349,800,000	$ 349,800,000
Dividend restriction, single threshold, percentage of aggregate Revolver Commitments	25.00%	25.00%
Dividend restriction, combination thresholds, percentage of aggregate Revolver Commitments	15.00%	15.00%
Dividend restriction, combination thresholds, fixed-charge coverage ratio (as a percent)		100.00%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 370,000,000
Commitment fee rate (as a percentage)	0.25%
Amount outstanding on Revolving Credit Facility	$ 0	$ 0	$ 0
Letters of credit outstanding	$ 5,900,000	5,900,000	$ 5,900,000
Revolving Credit Facility, Minimum Amount Outstanding During Period		0
Revolving Credit Facility, Maximum Amount Outstanding During Period		$ 89,200,000
Revolving Credit Facility, Average Interest Rates During Period		2.25%
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%
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%
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.25%
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.75%
Asset Based Credit Facility Term Loan [Member]
ABL Term Loan
Debt Instrument, Face Amount				$ 50,000,000
Debt Instrument, Interest Rate During Period		2.83%
Debt Instrument, Interest Rate During Period With Patronage Credits		2.10%
Asset Based Credit Facility Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.75%
Asset Based Credit Facility Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		2.25%
Asset Based Credit Facility Term Loan [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.75%
Asset Based Credit Facility Term Loan [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.25%

X

- Definition

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

+ References

No definition available.

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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

No definition available.

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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.

+ Details

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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.

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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.

+ References

No definition available.

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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.

+ References

No definition available.

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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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No definition available.

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- Definition

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
-Paragraph 8
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- Definition

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.

+ Details

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X

- 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

The effective interest rate during the reporting period.

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- Definition

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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No definition available.

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- Definition

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

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

No definition available.

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