CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Class A Common Stock [Member]	Class C Common Stock [Member]	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Series C Preferred Stock [Member]	Series D Preferred Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Series A Preferred Stock [Member]	Additional Paid-in Capital [Member] Series B Preferred Stock [Member]	Additional Paid-in Capital [Member] Series C Preferred Stock [Member]	Additional Paid-in Capital [Member] Series D Preferred Stock [Member]	Cumulative Distributions [Member]	Cumulative Distributions [Member] Series A Preferred Stock [Member]	Cumulative Distributions [Member] Series B Preferred Stock [Member]	Cumulative Distributions [Member] Series C Preferred Stock [Member]	Cumulative Distributions [Member] Series D Preferred Stock [Member]	Net loss to Common Stockholders [Member]	Net loss to Common Stockholders [Member] Series A Preferred Stock [Member]	Net loss to Common Stockholders [Member] Series B Preferred Stock [Member]	Net loss to Common Stockholders [Member] Series C Preferred Stock [Member]	Net loss to Common Stockholders [Member] Series D Preferred Stock [Member]	Non-controlling Interests [Member]	Non-controlling Interests [Member] Series A Preferred Stock [Member]	Non-controlling Interests [Member] Series B Preferred Stock [Member]	Non-controlling Interests [Member] Series C Preferred Stock [Member]	Non-controlling Interests [Member] Series D Preferred Stock [Member]
Balance at Dec. 31, 2017	$ 286,178	$ 242	$ 1				$ 68,705	$ 318,170					$ (134,817)					$ (29,469)					$ 63,346
Balance (in shares) at Dec. 31, 2017		24,218,359	76,603				2,850,602
Issuance of Class A common stock, net	17	$ 0	$ 0				$ 0	17					0					0					0
Issuance of Class A common stock, net (in shares)		1,984	0		234,793		0
Repurchase of Class A common stock	(5,162)	$ (6)	$ 0					(5,156)
Repurchase of Class A common stock (in shares)		(637,733)	0
Issuance of Long-Term Incentive Plan ("LTIP") units for director compensation	190	$ 0	$ 0				$ 0	0					0					0					190
Issuance of Long-Term Incentive Plan ("LTIP") units for director compensation (in shares)		0	0				0
Issuance of LTIP units for compensation	2,522	$ 0	$ 0				$ 0	0					0					0					2,522
Issuance of LTIP units for compensation (in shares)		0	0				0
Issuance of LTIP units	1,342	$ 0	$ 0				$ 0	0					0					0					1,342
Issuance of Series B warrants	756	0	0				0	756					0					0					0
Contributions from noncontrolling interests, net	5,059	0	0				0	0					0					0					5,059
Common stock distribution declared	(3,796)	0	0				0	0					(3,796)					0					0
Preferred Stock distributions declared	(16,890)			$ (5,900)	$ (6,237)	$ (2,214)	(2,539)		$ 0	$ 0	$ 0	$ 0		$ (5,900)	$ (6,237)	$ (2,214)	$ (2,539)		$ 0	$ 0	$ 0	$ 0		$ 0	$ 0	$ 0	$ 0
Stock accretion	(2,510)			$ (336)	$ (2,044)	$ (130)			$ 0	$ 0	$ 0			$ (336)	$ (2,044)	$ (130)			$ 0	$ 0	$ 0			$ 0	$ 0	$ 0
Distributions to operating partnership noncontrolling interests	(1,499)	0	0				0	0					0					0					(1,499)
Distributions to partially owned noncontrolling interests	(846)	0	0				0	0					0					0					(846)
Redemption of Series B Preferred Stock and conversion into Class A common stock	764	$ 1	$ 0				$ 0	763					0					0					0
Redemption of Series B Preferred Stock and conversion into Class A common stock (in shares)		76,381	0				0
Cash redemption of Series B Preferred Stock	5	$ 0	$ 0				$ 0	5					0					0					0
Transfer of noncontrolling interest to controlling interest	(1,384)																						(1,384)
Acquisition of noncontrolling interest	(7,705)							(7,705)
Adjustment for noncontrolling interest ownership in Operating Partnership	0	0	0				0	3,745					0										(3,745)
Net loss	(6,391)	0	0				0	0					0					(238)					(6,153)
Balance at Jun. 30, 2018	$ 250,650	$ 237	$ 1				$ 68,705	$ 310,595					$ (158,013)					$ (29,707)					$ 58,832
Balance (in shares) at Jun. 30, 2018		23,658,991	76,603				2,850,602