Derivatives - Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments - unrealized			$ (11,391,000)	$ 20,986,000
Forward Currency Contract \| Gain (Loss) on Derivative Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments - unrealized	$ 16,227,000	$ 5,046,000	12,029,000	20,987,000
Gain on derivative instruments - realized	7,926,000	1,246,000	16,590,000	7,811,000
Interest Rate Cap \| Gain (Loss) on Derivative Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments - unrealized	0	(1,000)	0	(1,000)
Gain on derivative instruments - realized	24,153,000	6,291,000	28,619,000	28,797,000
Derivative notional amount	0.0	36,200,000	0.0	36,200,000
Interest Rate Swap \| Gain (Loss) on Derivative Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments - unrealized	(10,307,000)	0	(23,420,000)	0
Derivative notional amount	$ 500,000,000.0	$ 0.0	$ 500,000,000.0	$ 0.0

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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)
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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.

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Nominal or face amount used to calculate payment on derivative.

+ 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
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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