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Financial Instruments Risk (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016
Interest Rate Derivatives [Abstract]
Long-term debt		$ 443,792	$ 440,544
Repayments of Long-term Debt		405,774	5,500	$ 7,500
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Noncurrent Liabilities [Member]
Interest Rate Derivatives [Abstract]
Fair value of interest swap agreements, Liability		600
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Noncurrent Assets [Member]
Interest Rate Derivatives [Abstract]
Fair value of interest rate swap agreements, Asset			$ 800
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Interest rate swaps, notional amount		$ 50,000
Interest rate swaps, fixed interest rate		1.007%
Interest Rate Swap - 50 Million Notional Amount Fixed At 0.39% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Interest rate swaps, notional amount		$ 50,000
Interest rate swaps, forward interest rate		0.39%
ABL Term Loan Due 2025 [Member]
Interest Rate Derivatives [Abstract]
Long-term debt		$ 50,000
Term Loan Due 2026 [Member]
Interest Rate Derivatives [Abstract]
Repayments of Long-term Debt	$ 45,000				$ 30,000
Notional Principal Amount of Liquidated Derivative Instruments		$ 45,000

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The notional principal amounts of liquidated derivative instruments.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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Fair value as of the balance sheet date of all derivative liabilities not designated as hedging instruments.

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