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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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Debt - Schedule of Debt (Details) - USD ($)	3 Months Ended		6 Months Ended
Debt - Schedule of Debt (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt, gross	$ 2,881,774,000		$ 2,881,774,000			$ 2,842,510,000
Unamortized discounts on unsecured senior notes	(4,385,000)		(4,385,000)			(2,546,000)
Deferred financing costs, net	(36,332,000)		(36,332,000)			(36,421,000)
Total debt per balance sheet	2,841,057,000		2,841,057,000			2,803,543,000
Amortization of financing costs			3,976,000	$ 3,888,000
Asset-backed Securitizations, Unsecured Senior Notes and Term Loan Facility
Debt Instrument [Line Items]
Amortization of financing costs	1,500,000	$ 1,500,000	3,000,000.0	$ 2,900,000
Secured Debt
Debt Instrument [Line Items]
Debt, gross	$ 1,981,774,000		$ 1,981,774,000			1,992,510,000
Secured Debt \| 2014-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.42%		4.42%
Debt, gross	$ 488,519,000		$ 488,519,000			491,195,000
Secured Debt \| 2014-SFR 3
Debt Instrument [Line Items]
Interest Rate	4.40%		4.40%
Debt, gross	$ 504,119,000		$ 504,119,000			506,760,000
Secured Debt \| 2015-SFR 1
Debt Instrument [Line Items]
Interest Rate	4.14%		4.14%
Debt, gross	$ 529,433,000		$ 529,433,000			532,197,000
Secured Debt \| 2015-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.36%		4.36%
Debt, gross	$ 459,703,000		$ 459,703,000			462,358,000
Senior Notes \| 4.25% Senior Notes Due 2028
Debt Instrument [Line Items]
Interest Rate	4.25%		4.25%
Effective interest rate	4.08%		4.08%
Debt, gross	$ 500,000,000		$ 500,000,000			500,000,000
Senior Notes \| 4.90% Senior Notes Due 2029
Debt Instrument [Line Items]
Interest Rate					4.90%
Effective interest rate	4.90%		4.90%
Debt, gross	$ 400,000,000		$ 400,000,000			0
Deferred financing costs, net					$ (1,000,000.0)
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Effective interest rate	3.60%		3.60%
Debt, gross	$ 0		$ 0			250,000,000
Maximum borrowing capacity	800,000,000.0		$ 800,000,000.0
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]
Debt, gross	$ 0		$ 0			100,000,000
Deferred financing costs, net						$ (800,000)
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%