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Debt - Schedule of Mortgage Loans (Details) $ in Thousands			9 Months Ended
Debt - Schedule of Mortgage Loans (Details) $ in Thousands	Oct. 09, 2018 USD ($)	Jul. 09, 2018 USD ($)	Sep. 30, 2018 USD ($) extension	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Less: deferred financing costs, net			$ (66,544)
Long-term debt			9,454,919
Payments on mortgage loans			3,416,296	$ 2,086,622
Debt instrument, unamortized discount			$ 19,912		$ 26,464
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, variable rate			2.26%
Secured Debt
Debt Instrument [Line Items]
Total Securitizations			$ 7,466,382		7,608,228
Less: deferred financing costs, net			(56,682)		(28,075)
Long-term debt			7,409,700		7,580,153
Payments on mortgage loans			3,416,296	$ 2,086,622
Debt instrument, unamortized discount			0
CAH 2014-1 \| Secured Debt
Debt Instrument [Line Items]
Total Securitizations			0		473,384
CAH 2014-2 \| Secured Debt
Debt Instrument [Line Items]
Total Securitizations			0		385,401
IH 2015-1 \| Secured Debt
Debt Instrument [Line Items]
Total Securitizations			0		528,795
IH 2015-2 \| Secured Debt
Debt Instrument [Line Items]
Total Securitizations			0		627,259
IH 2015-3 \| Secured Debt
Debt Instrument [Line Items]
Total Securitizations			$ 0		1,165,886
CAH 2015-1 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			4.16%
Total Securitizations			$ 646,760		656,551
CAH 2015-1 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			1.28%
CAH 2015-1 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			3.73%
CSH 2016-1 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			4.58%
Total Securitizations			$ 325,838		531,517
Payments on mortgage loans		$ 200,000
CSH 2016-1 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			1.58%
CSH 2016-1 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			5.08%
CSH 2016-1 \| Subsequent Event \| Secured Debt
Debt Instrument [Line Items]
Payments on mortgage loans	$ 50,000
CSH 2016-2 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			4.11%
Total Securitizations			$ 603,076		609,815
CSH 2016-2 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			1.33%
CSH 2016-2 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			4.23%
IH 2017-1 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			4.23%
Total Securitizations			$ 995,870		996,453
Coupon Rate			4.23%
Debt instrument, term			10 years
Debt instrument, unamortized discount			$ 3,081		3,345
SWH 2017-1 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			3.81%
Total Securitizations			$ 767,835		769,754
SWH 2017-1 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			1.02%
SWH 2017-1 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			3.47%
IH 2017-2 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			3.77%
Total Securitizations			$ 862,181		863,413
IH 2017-2 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			0.91%
IH 2017-2 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			3.06%
IH 2018-1 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			3.50%
Total Securitizations			$ 913,317		0
IH 2018-1 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			0.76%
IH 2018-1 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			2.56%
IH 2018-2 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			3.64%
Total Securitizations			$ 1,051,996		0
IH 2018-2 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			0.95%
IH 2018-2 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			2.30%
IH 2018-3 \| Secured Debt
Debt Instrument [Line Items]
Interest rate			3.68%
Total Securitizations			$ 1,299,509		$ 0
IH 2018-3 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Basis spread			1.05%
IH 2018-3 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Basis spread			2.30%
CAH 2015-1, CSH 2016-1, CSH 2016-2, SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, extended term			1 year
CAH 2015-1, CSH 2016-1, CSH 2016-2, SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3 \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Debt instrument, term			2 years
Debt instrument, number of extensions \| extension			2
CAH 2015-1, CSH 2016-1, CSH 2016-2, SWH 2017-1, IH 2017-2, IH 2018-1, IH 2018-2, IH 2018-3 \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Debt instrument, term			3 years
Debt instrument, number of extensions \| extension			5