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Indebtedness - Schedule of Outstanding Debts (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Feb. 28, 2018
Unsecured debt
Debt Instrument [Line Items]
Total unsecured floating rate debt	$ 987,500,000	$ 689,000,000
Debt issuance costs, net	1,259,000	1,714,000
Senior unsecured notes
Debt Instrument [Line Items]
Debt issuance costs, net	21,037,000	23,081,000
Face Amount	1,850,000,000	2,250,000,000
Unamortized Discount	8,282,000	9,974,000
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility, maximum borrowing capacity	1,000,000,000
Unsecured Revolving Credit Facility | Unsecured debt
Debt Instrument [Line Items]
Unsecured revolving credit facility	537,500,000	139,000,000
Unsecured revolving credit facility, maximum borrowing capacity	1,000,000,000
Unsecured term loan due January 2020
Debt Instrument [Line Items]
Face Amount	350,000,000
Unsecured term loan due January 2020 | Unsecured debt
Debt Instrument [Line Items]
Unsecured term loans	0	350,000,000
Unsecured term loan due June 2020 | Unsecured debt
Debt Instrument [Line Items]
Unsecured term loans	250,000,000	0
Unsecured term loan due September 2022 | Unsecured debt
Debt Instrument [Line Items]
Unsecured term loans	$ 200,000,000	200,000,000
Senior unsecured notes due 2019 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	3.25%
Face Amount	$ 0	400,000,000
Unamortized Discount	$ 0	19,000
Senior unsecured notes due 2020 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	6.75%
Face Amount	$ 200,000,000	200,000,000
Unamortized Discount	$ 59,000	274,000
Senior unsecured notes due 2021 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	6.75%
Face Amount	$ 300,000,000	300,000,000
Unamortized Discount	$ 1,024,000	1,558,000
Senior unsecured notes due 2024 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	4.75%
Face Amount	$ 250,000,000	250,000,000
Unamortized Discount	$ 342,000	421,000
Senior unsecured notes due 2028
Debt Instrument [Line Items]
Coupon			4.75%
Face Amount			$ 500,000
Senior unsecured notes due 2028 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	4.75%
Face Amount	$ 500,000,000	500,000,000
Unamortized Discount	$ 6,857,000	7,702,000
Senior unsecured notes due 2042 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	5.625%
Face Amount	$ 350,000,000	350,000,000
Unamortized Discount	$ 0	0
Senior unsecured notes due 2046 | Senior unsecured notes
Debt Instrument [Line Items]
Coupon	6.25%
Face Amount	$ 250,000,000	250,000,000
Unamortized Discount	$ 0	$ 0

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