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Debt - Schedule of Debt (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt, gross	$ 2,876,223,000		$ 2,876,223,000			$ 2,842,510,000
Unamortized discounts on unsecured senior notes	(4,264,000)		(4,264,000)			(2,546,000)
Deferred financing costs, net	(34,844,000)		(34,844,000)			(36,421,000)
Total debt per balance sheet	2,837,115,000		2,837,115,000			2,803,543,000
Amortization of financing costs			5,965,000	$ 5,838,000
Asset-backed Securitizations, Unsecured Senior Notes and Term Loan Facility
Debt Instrument [Line Items]
Amortization of financing costs	1,500,000	$ 1,500,000	4,500,000	$ 4,400,000
Secured Debt
Debt Instrument [Line Items]
Debt, gross	$ 1,976,223,000		$ 1,976,223,000			1,992,510,000
Secured Debt | 2014-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.42%		4.42%
Debt, gross	$ 487,163,000		$ 487,163,000			491,195,000
Secured Debt | 2014-SFR 3
Debt Instrument [Line Items]
Interest Rate	4.40%		4.40%
Debt, gross	$ 502,713,000		$ 502,713,000			506,760,000
Secured Debt | 2015-SFR 1
Debt Instrument [Line Items]
Interest Rate	4.14%		4.14%
Debt, gross	$ 527,941,000		$ 527,941,000			532,197,000
Secured Debt | 2015-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.36%		4.36%
Debt, gross	$ 458,406,000		$ 458,406,000			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	3.22%		3.22%
Debt, gross	$ 0		$ 0			250,000,000
Maximum borrowing capacity	800,000,000.0		800,000,000.0
Outstanding letters of credit	4,800,000		4,800,000			1,100,000
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
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.20%

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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