Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Interest expense	$ (116,220)	$ (48,213)	$ (215,496)	$ (89,727)
Cash Flow Hedging \| Interest rate contract
Derivative [Line Items]
Net interest expense on cash flows hedges	(640)	(804)	(1,277)	(1,802)
Interest expense	$ (640)	$ (804)	$ (1,277)	$ (1,802)

Amount of the cost of borrowed funds accounted for as interest expense.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_InterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration