Equity - Common Stock Continuous Offering Program (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 15, 2019	Sep. 19, 2016
Class of Stock [Line Items]
Issuance of Common Stock, net	$ 1,014,215,000
Common Stock [Member]
Class of Stock [Line Items]
Distribution agreement gross sales price (up to)			$ 750,000,000.0	$ 750,000,000.0
Continuous Equity Offering Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Issuance of Common Stock, net (shares)	5,000,000.0	0
Issuance of Common Stock, net	$ 42,500,000
Proceeds from issuance of common stock	$ 41,800,000
Continuous Equity Offering Program New [Member] | Common Stock [Member]
Class of Stock [Line Items]
Issuance of Common Stock, net (shares)	9,000,000.0
Issuance of Common Stock, net	$ 86,700,000
Proceeds from issuance of common stock	$ 85,400,000
Number of shares available (in shares)	663,300,000
Weighted Average [Member] | Continuous Equity Offering Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Share price (in dollars per share)	$ 8.42
Share price net of offering costs (in dollars per share)	8.30
Weighted Average [Member] | Continuous Equity Offering Program New [Member] | Common Stock [Member]
Class of Stock [Line Items]
Share price (in dollars per share)	9.60
Share price net of offering costs (in dollars per share)	$ 9.46