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Credit Facilities and Long-Term Debt, Revolving Credit Facility (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 15, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Line of Credit Facility [Abstract]
Outstanding borrowings under credit facility		$ 105,000		$ 52,460
Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity		250,000
Line of credit facility, accordian feature		$ 50,000
Maturity date		Dec. 31, 2023
Additional available borrowing capacity		$ 141,800
Outstanding borrowings under credit facility		105,000		52,500
Outstanding letters of credit		$ 3,100		$ 3,100
Weighted average interest rate		2.20%		3.50%
Coverage ratio		1
Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Abstract]
Additional available borrowing capacity	$ 47,200
Outstanding borrowings under credit facility	191,300
Proceeds from line of credit	$ 75,000
Revolving Credit Facility [Member] | Pay Cash Dividend [Member]
Line of Credit Facility [Abstract]
Agreement permissions		$ 20,000
Revolving Credit Facility [Member] | Stock Repurchase [Member]
Line of Credit Facility [Abstract]
Agreement permissions		20,000
Revolving Credit Facility [Member] | Stock Repurchase [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Borrowing base		25,000
Revolving Credit Facility [Member] | Cash Dividend And Stock Repurchases [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Agreement permissions		$ 20,000
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate		1.25%
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate		1.75%
Revolving Credit Facility [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Abstract]
Outstanding borrowings under credit facility				$ 12,500
Weighted average interest rate				5.00%
Average daily loan balance outstanding		$ 2,500	$ 1,400	$ 1,700
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate		0.25%
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate		0.75%
Revolving Credit Facility [Member] | Fixed Assets Not Included in Borrowing Base [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Borrowing base		$ 25,000
Borrowing base percentage		10.00%
Revolving Credit Facility [Member] | Fixed Assets Included in Borrowing Base [Member]
Line of Credit Facility [Abstract]
Borrowing base		$ 31,250
Borrowing base percentage		12.50%
Revolving Credit Facility [Member] | Direct Borrowings [Member]
Line of Credit Facility [Abstract]
Outstanding borrowings under credit facility				$ 40,000
Weighted average interest rate				2.30%
Revolving Credit Facility [Member] | Canada [Member]
Line of Credit Facility [Abstract]
Maximum borrowing capacity		$ 10,000

X

- Definition

The credit agreement permits us to pay cash dividends and make stock repurchases in any twelve month period subject to a minimum availability. Provided specific conditions are met, the credit agreement also permits acquisitions, permissible debt financing, capital expenditures, and cash dividend payments and stock repurchases.

+ References

No definition available.

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- Definition

The amount of money a lender will loan to a company based on the value of the collateral the company pledges. The borrowing base is usually determined by a method called margining, where the lender determines a discount factor that is multiplied by the value of the collateral; the result is the amount that will be loaned to the company.

+ References

No definition available.

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- Definition

The percentage of the amount of money a lender will loan to a company based on the value of the collateral the company pledges. The borrowing base is usually determined by a method called margining, where the lender determines a discount factor that is multiplied by the value of the collateral; the result is the amount that will be loaned to the company.

+ References

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- Definition

Refers to a financial covenant requiring us, on a consolidated basis, to maintain a fixed charge coverage ratio

+ References

No definition available.

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- Definition

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

+ 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.

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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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- References

No definition available.

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

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- Definition

The effective interest rate at the end of the reporting period.

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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

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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

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The carrying value as of the balance sheet date of the current portion 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 942
-SubTopic 210
-Section S99
-Paragraph 1
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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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