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Debt - Long-term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 29, 2016
Debt Instrument [Line Items]
Total debt	$ 2,517,216,000	$ 2,981,062,000
Unamortized discount on exchangeable senior notes	(895,000)	(1,883,000)
Equity component of exchangeable senior notes	(2,408,000)	(4,969,000)
Deferred financing costs, net	(38,026,000)	(51,636,000)
Total debt per balance sheet	2,475,887,000	2,922,574,000
Amortization of debt issuance costs	$ 8,163,000	10,475,000	$ 8,305,000
Convertible Debt | 3.25% Exchangeable Senior Notes
Debt Instrument [Line Items]
Interest rate	3.25%			3.25%
Total debt	$ 115,000,000	115,000,000
Unamortized discount on exchangeable senior notes				$ (2,700,000)
Equity component of exchangeable senior notes				$ (7,000,000)
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate	2.76%
Total debt	$ 140,000,000	0
Credit facility maximum borrowing capacity	$ 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]
Interest rate	2.91%
Total debt	$ 200,000,000	325,000,000
Deferred financing costs, net	(2,000,000)	(3,300,000)
Credit facility maximum borrowing capacity	$ 200,000,000
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%
Secured Debt
Debt Instrument [Line Items]
Total debt	$ 2,013,357,000	2,491,234,000
Amortization of debt issuance costs	6,400,000	8,500,000	$ 7,000,000
Secured Debt | 2014-SFR 1
Debt Instrument [Line Items]
Total debt	$ 0	456,074,000
Secured Debt | 2014-SFR 2
Debt Instrument [Line Items]
Interest rate	4.42%
Total debt	$ 496,326,000	501,810,000
Secured Debt | 2014-SFR 3
Debt Instrument [Line Items]
Interest rate	4.40%
Total debt	$ 512,041,000	517,827,000
Secured Debt | 2015-SFR 1
Debt Instrument [Line Items]
Interest rate	4.14%
Total debt	$ 537,723,000	543,480,000
Secured Debt | 2015-SFR 2
Debt Instrument [Line Items]
Interest rate	4.36%
Total debt	$ 467,267,000	472,043,000
Secured Debt | Notes Payable
Debt Instrument [Line Items]
Interest rate	4.06%
Total debt	$ 48,859,000	$ 49,828,000

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

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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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