CONSOLIDATED BALANCE SHEETS [Parenthetical] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	230,975,000	230,975,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	747,586,185	747,586,185
Common stock, shares issued	24,191,951	19,567,506
Common stock, shares outstanding	24,191,951	19,567,506
Cumulative Preferred Stock [Member] | Series A [Member]
Preferred Stock, Dividend Rate, Percentage	8.25%	8.25%
Temporary Equity, Liquidation Preference Per Share	$ 25.00	$ 25.00
Temporary Equity, Shares Authorized	10,875,000	10,875,000
Temporary Equity, Shares Issued	5,721,460	5,721,460
Temporary Equity, Shares Outstanding	5,721,460	5,721,460
Cumulative Preferred Stock [Member] | Series C [Member]
Preferred Stock, Dividend Rate, Percentage	7.625%	7.625%
Temporary Equity, Liquidation Preference Per Share	$ 25.00	$ 25.00
Temporary Equity, Shares Authorized	4,000,000	4,000,000
Temporary Equity, Shares Issued	2,323,750	2,323,750
Temporary Equity, Shares Outstanding	2,323,750	2,323,750
Cumulative Preferred Stock [Member] | Series D [Member]
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 25.00	$ 25.00
Preferred Stock, Shares Authorized	4,000,000	4,000,000
Preferred Stock, Shares Issued	2,850,602	2,850,602
Preferred Stock, Shares Outstanding	2,850,602	2,850,602
Preferred Stock, Dividend Rate, Percentage	7.125%	7.125%
Cumulative Redeemable Preferred Stock [Member] | Series B [Member]
Temporary Equity, Liquidation Preference Per Share	$ 1,000	$ 1,000
Temporary Equity, Shares Authorized	150,000	150,000
Temporary Equity, Shares Issued	95,552	21,482
Temporary Equity, Shares Outstanding	95,552	21,482