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Derivative Instruments - Location and Amounts of Interest Rate Swap Gains and Losses (Details) - Derivatives Not Designated as Hedging Instruments - Interest Rate Swaps - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net unrealized gain (loss) on financial instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest rate swap gains (losses) | $ 6,527 | $ 3,774 | $ 20,008 | $ (32,722)
Financing interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest rate swap gains (losses) | $ (7,037) | $ (5,438) | $ (18,575) | $ (10,336)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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