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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt discount.

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Debt - Schedule of Debt (Details) - USD ($)	3 Months Ended		9 Months Ended
Debt - Schedule of Debt (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Feb. 28, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt, gross	$ 2,712,688,000		$ 2,712,688,000			$ 2,517,216,000
Unamortized discounts on unsecured and exchangeable senior notes	(2,751,000)		(2,751,000)			(895,000)
Equity component of exchangeable senior notes	(358,000)		(358,000)			(2,408,000)
Deferred financing costs, net	(37,876,000)		(37,876,000)			(38,026,000)
Total debt per balance sheet	2,671,703,000		2,671,703,000			2,475,887,000
Amortization of financing costs			5,838,000	$ 6,285,000
Revolving Credit Facility
Debt Instrument [Line Items]
Deferred financing costs, net	(7,400,000)		(7,400,000)			(8,800,000)
Asset-backed Securitizations, Unsecured Senior Notes and Term Loan Facility
Debt Instrument [Line Items]
Amortization of financing costs	1,500,000	$ 1,400,000	4,400,000	$ 5,000,000
Secured Debt
Debt Instrument [Line Items]
Debt, gross	$ 1,997,688,000		$ 1,997,688,000			2,013,357,000
Secured Debt \| 2014-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.42%		4.42%
Debt, gross	$ 492,478,000		$ 492,478,000			496,326,000
Secured Debt \| 2014-SFR 3
Debt Instrument [Line Items]
Interest Rate	4.40%		4.40%
Debt, gross	$ 508,080,000		$ 508,080,000			512,041,000
Secured Debt \| 2015-SFR 1
Debt Instrument [Line Items]
Interest Rate	4.14%		4.14%
Debt, gross	$ 533,578,000		$ 533,578,000			537,723,000
Secured Debt \| 2015-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.36%		4.36%
Debt, gross	$ 463,552,000		$ 463,552,000			467,267,000
Secured Debt \| Secured Note Payable
Debt Instrument [Line Items]
Debt, gross	$ 0		$ 0			48,859,000
Senior Notes \| 4.25% Senior Notes Due 2028
Debt Instrument [Line Items]
Interest Rate	4.25%		4.25%		4.25%
Effective interest rate	4.08%		4.08%
Debt, gross	$ 500,000,000		$ 500,000,000			0
Deferred financing costs, net					$ (1,900,000)
Convertible Debt \| 3.25% Exchangeable Senior Notes
Debt Instrument [Line Items]
Interest Rate	3.25%		3.25%
Debt, gross	$ 115,000,000		$ 115,000,000			115,000,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Effective interest rate	3.46%		3.46%
Debt, gross	$ 0		$ 0			140,000,000
Maximum borrowing capacity	$ 800,000,000		$ 800,000,000
Line of Credit \| Revolving Credit Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.825%
Line of Credit \| Revolving Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.55%
Line of Credit \| Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.00%
Line of Credit \| Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.55%
Line of Credit \| Term Loan facility
Debt Instrument [Line Items]
Effective interest rate	3.61%		3.61%
Debt, gross	$ 100,000,000		$ 100,000,000			200,000,000
Deferred financing costs, net	$ (800,000)		$ (800,000)			$ (2,000,000)
Line of Credit \| Term Loan facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.90%
Line of Credit \| Term Loan facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.75%
Line of Credit \| Term Loan facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.00%
Line of Credit \| Term Loan facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.75%