CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	4 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000	500,000,000
Common stock, shares issued (in shares)	216,509,093	216,509,093	207,604,391
Common stock, shares outstanding (in shares)	216,509,093	216,509,093	207,604,391
Series D Cumulative Redeemable Preferred Stock
Preferred stock, Cumulative Redeemable Preferred Stock, dividend rate (as a percent)			8.00%
Preferred stock, Cumulative Redeemable Preferred Stock, shares issued (in shares)	0	0	4,600,000
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	0	0	4,600,000
Preferred stock, Cumulative Redeemable Preferred Stock, liquidation preference (in dollars per share)			$ 25.00
Series E Cumulative Redeemable Preferred Stock
Preferred stock, Cumulative Redeemable Preferred Stock, dividend rate (as a percent)		6.95%
Preferred stock, Cumulative Redeemable Preferred Stock, shares issued (in shares)	4,600,000	4,600,000	0
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	4,600,000	4,600,000	0
Preferred stock, Cumulative Redeemable Preferred Stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Series F Cumulative Redeemable Preferred Stock
Preferred stock, Cumulative Redeemable Preferred Stock, dividend rate (as a percent)	6.45%
Preferred stock, Cumulative Redeemable Preferred Stock, shares issued (in shares)	3,000,000	3,000,000	0
Preferred stock, Cumulative Redeemable Preferred Stock, shares outstanding (in shares)	3,000,000	3,000,000	0
Preferred stock, Cumulative Redeemable Preferred Stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00