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Derivative Instruments - Location and Amounts of Interest Rate Swap Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains on financial instruments	$ (21,516)	$ 2,706	$ (33,428)	$ 16,214
Derivatives Not Designated as Hedging Instruments | Net unrealized gain on interest rate swap agreements | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains on financial instruments	(21,860)	3,944	(34,069)	17,452
Derivatives Not Designated as Hedging Instruments | Financing interest income | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized gains on financial instruments	$ 2,142	$ 1,363	$ 4,258	$ 1,676

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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)
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