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Debt:Asset-Based Credit Facility (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | 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% |  |
Threshold of availability, below which 1:1 fixed charge coverage ratio must be met | $ 37,000,000 |  |
Current availability | $ 364,600,000 |  |
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% |  |
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 |
Letters of credit outstanding | 4,600,000 | $ 5,900,000 |
Revolving Credit Facility, Minimum Amount Outstanding During Period | 0 |  |
Revolving Credit Facility, Maximum Amount Outstanding During Period | $ 3,700,000 |  |
Revolving Credit Facility, Average Interest Rates During Period | 3.12% |  |
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 | 3.73% |  |
Debt Instrument, Interest Rate During Period With Patronage Credits | 3.00% |  |
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. + Details
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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. + Details
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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. + Details
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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. + Details
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- Definition Minimum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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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. + Details
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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. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References No definition available. + Details
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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + Details
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