Amount of amortization expense attributable to debt issuance costs.

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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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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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Debt - Schedule of Debt (Details) - USD ($)	3 Months Ended
Debt - Schedule of Debt (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018	Jan. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt, gross	$ 2,986,953,000			$ 2,842,510,000
Unamortized discounts on unsecured senior notes	(4,506,000)			(2,546,000)
Deferred financing costs, net	(38,522,000)			(36,421,000)
Total debt per balance sheet	2,943,925,000			2,803,543,000
Amortization of financing costs	1,956,000	$ 1,900,000
Revolving Credit Facility
Debt Instrument [Line Items]
Deferred financing costs, net	(6,400,000)			(6,900,000)
Asset-backed Securitizations, Unsecured Senior Notes and Term Loan Facility
Debt Instrument [Line Items]
Amortization of financing costs	1,500,000	$ 1,400,000
Secured Debt
Debt Instrument [Line Items]
Debt, gross	$ 1,986,953,000			1,992,510,000
Secured Debt \| 2014-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.42%
Debt, gross	$ 489,801,000			491,195,000
Secured Debt \| 2014-SFR 3
Debt Instrument [Line Items]
Interest Rate	4.40%
Debt, gross	$ 505,439,000			506,760,000
Secured Debt \| 2015-SFR 1
Debt Instrument [Line Items]
Interest Rate	4.14%
Debt, gross	$ 530,816,000			532,197,000
Secured Debt \| 2015-SFR 2
Debt Instrument [Line Items]
Interest Rate	4.36%
Debt, gross	$ 460,897,000			462,358,000
Senior Notes \| 4.25% Senior Notes Due 2028
Debt Instrument [Line Items]
Interest Rate	4.25%
Effective interest rate	4.08%
Debt, gross	$ 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%
Debt, gross	$ 400,000,000			0
Deferred financing costs, net			$ (1,000,000)
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Effective interest rate	3.69%
Debt, gross	$ 0			250,000,000
Maximum borrowing capacity	$ 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	3.84%
Debt, gross	$ 100,000,000			100,000,000
Deferred financing costs, net	$ (700,000)			$ (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%