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Financial Instruments Risk (Details) - USD ($) $ in Thousands	1 Months Ended
	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2016	Feb. 16, 2016
Interest Rate Derivatives [Abstract]
Long-term debt		$ 440,544	$ 439,428
Term Loans Due 2022 and 2026 [Member]
Interest Rate Derivatives [Abstract]
Long-term debt		95,000
Term Loan Due 2026 [Member]
Interest Rate Derivatives [Abstract]
Liquidation of Derivative Notional Amount	$ 30,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Non-Current Assets [Member]
Interest Rate Derivatives [Abstract]
Fair value of interest rate swap agreements, Asset		800	3,800
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount					$ 50,000
Interest rate swaps, fixed interest rate					1.007%
Interest Rate Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount				$ 75,000
Interest Rate Swap - $45 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount				$ 45,000
Interest rate swaps, fixed interest rate				1.256%
Interest rate swap – $50 and $45 Million Notional Amount fixed at 1.007% and 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount		$ 95,000	$ 95,000

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- Definition

The amount liquidated from the total notional amount of a derivative.

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

Fair value as of the balance sheet date of all derivative assets not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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)
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