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Debt - Long-term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018	Jun. 30, 2017	Feb. 29, 2016
Debt Instrument [Line Items]
Total debt	$ 2,842,510,000	$ 2,517,216,000
Unamortized discount on unsecured and exchangeable notes	(2,546,000)	(895,000)
Equity component of exchangeable senior notes	0	(2,408,000)
Deferred financing costs, net	(36,421,000)	(38,026,000)
Total debt per balance sheet	2,803,543,000	2,475,887,000
Amortization of debt issuance costs	7,788,000	8,163,000	$ 10,475,000
Revolving Credit Facility
Debt Instrument [Line Items]
Deferred financing costs, net	(6,900,000)	(8,800,000)
Asset-Backed Securitizations, Unsecured Senior Notes and Term Loan Facility
Debt Instrument [Line Items]
Amortization of debt issuance costs	5,800,000	6,400,000	$ 8,500,000
Secured Debt
Debt Instrument [Line Items]
Total debt	$ 1,992,510,000	2,013,357,000
Secured Debt | 2014-SFR 2
Debt Instrument [Line Items]
Interest rate	4.42%
Total debt	$ 491,195,000	496,326,000
Secured Debt | 2014-SFR 3
Debt Instrument [Line Items]
Interest rate	4.40%
Total debt	$ 506,760,000	512,041,000
Secured Debt | 2015-SFR 1
Debt Instrument [Line Items]
Interest rate	4.14%
Total debt	$ 532,197,000	537,723,000
Secured Debt | 2015-SFR 2
Debt Instrument [Line Items]
Interest rate	4.36%
Total debt	$ 462,358,000	467,267,000
Secured Debt | Notes Payable
Debt Instrument [Line Items]
Total debt	$ 0	48,859,000
Exchangeable senior notes | 4.25% Senior Notes Due 2028
Debt Instrument [Line Items]
Interest rate	4.25%			4.25%
Total debt	$ 500,000,000	0
Effective interest rate	4.08%
Deferred financing costs, net				$ (1,900,000)
Convertible Debt | 3.25% Exchangeable Senior Notes
Debt Instrument [Line Items]
Interest rate						3.25%
Total debt	$ 0	115,000,000
Unamortized discount on unsecured and exchangeable notes						$ (2,700,000)
Equity component of exchangeable senior notes						$ (7,000,000)
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	$ 250,000,000	140,000,000
Effective interest rate	3.70%
Credit facility maximum borrowing capacity	$ 200,000,000.0				$ 800,000,000
Line of Credit | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.20%
Line of Credit | Revolving Credit Facility | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	0.825%
Line of Credit | Revolving Credit Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Line of Credit | Revolving Credit Facility | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.55%
Line of Credit | Revolving Credit Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.55%
Line of Credit | Term loan facility, net
Debt Instrument [Line Items]
Total debt	$ 100,000,000	200,000,000
Effective interest rate	3.85%
Deferred financing costs, net	$ (800,000)	$ (2,000,000)
Line of Credit | Term loan facility, net | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Line of Credit | Term loan facility, net | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	0.90%
Line of Credit | Term loan facility, net | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Line of Credit | Term loan facility, net | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Line of Credit | Term loan facility, net | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%

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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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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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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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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