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Derivative Instruments - Location and Amounts of Derivative Gains and Losses in Condensed Consolidated Statements of Income (Details) - Derivatives not designated as hedging instruments - Interest rate swaps - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net unrealized (loss) gain on financial instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized (loss) gain on financial instruments	$ (27,569)	$ (35,363)	$ 3,772
Financing interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized (loss) gain on financial instruments	$ 15,842	$ (5,411)	$ (6,160)

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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.

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- Definition

The aggregate net gain (loss) on price risk derivatives included in earnings in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 815
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-Section 50
-Paragraph 4C
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