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Interest Rate Swaps (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Interest Rate Swaps
Term of the interest rate swap agreements	3 years
Average fixed-rate interest (as a percent)	0.32%
Notional amount	$ 324,100,000
Interest rate swaps located in current portion of derivative liabilities	402,469	$ 397,418
Interest rate swaps located in non-current portion of derivative liabilities	0	433,974
Not designated as hedging instrument
Interest Rate Swaps
Interest rate swaps located in current portion of derivative liabilities	(55,057)	(48,044)
Interest rate swaps located in non-current portion of derivative liabilities	53,078	(54,212)
Cash flow hedge | Designated as hedging instrument
Interest Rate Swaps
Notional amount	273,300,000
Interest rate swaps located in current portion of derivative liabilities	(347,412)	(349,374)
Interest rate swaps located in non-current portion of derivative liabilities	$ 202,061	$ (379,762)

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Fixed interest rate related to the interest rate derivative.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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Nominal or face amount used to calculate payment on derivative.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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