CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net loss	$ (15,275)	$ (7,028)	$ (2,974)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	67,004	51,146	32,435
Amortization of fair value adjustments	(434)	(319)	(362)
Preferred returns and equity in income of unconsolidated real estate joint ventures	(10,312)	(10,336)	(11,632)
Gain on sale of real estate investments	0	(50,163)	(4,947)
Gain on sale of real estate joint venture interests	0	(10,262)	0
Gain on revaluation of equity of business combination	0	0	(3,761)
Fair value adjustment of interest rate caps	2,846	0	0
Loss on extinguishment of debt and modification costs	0	0	(1,104)
Distributions of income and preferred returns from preferred equity investments and unconsolidated real estate joint ventures	9,464	9,252	11,405
Share-based compensation attributable to equity incentive plan	5,348	109	210
Share-based compensation to former Manager - LTIP Units	993	15,935	8,591
Share-based expense reimbursements – LTIP Units	1,066	0	0
Internalization OP Units issued	0	39,938	0
Internalization Class C Shares issued	0	814	0
Changes in operating assets and liabilities:
Due (from) to affiliates, net	(2,000)	(1,565)	950
Accounts receivable, prepaids and other assets	(2,029)	294	(1,867)
Accounts payable and other accrued liabilities	7,784	16,432	7,500
Net cash provided by operating activities	64,455	54,247	34,444
Cash flows from investing activities
Acquisitions of real estate investments	(333,540)	(493,311)	(472,791)
Capital expenditures	(21,240)	(46,971)	(6,413)
Investment in notes receivable from related parties	(22,032)	(54,096)	(14,717)
Proceeds from sale of real estate investments	0	71,945	36,675
Proceeds from sale of joint venture interests	0	17,603	20,521
Deconsolidation of interests in MDA Apartments, Novel Perimeter and Vickers Historic Roswell	0	(794)	0
Purchase of interests from noncontrolling interests	(12,178)	(7,864)	(15,581)
Investments in unconsolidated real estate joint venture interests	(17,888)	(20,989)	(26,864)
Net cash used in investing activities	(406,878)	(534,477)	(479,170)
Cash flows from financing activities
Distributions to common stockholders	(13,952)	(29,583)	(24,437)
Distributions to noncontrolling interests	(6,298)	(31,363)	(3,626)
Distributions to preferred stockholders	(35,014)	(26,042)	(9,664)
Contributions from noncontrolling interests	13,551	10,738	25,009
Borrowings on mortgages payable	411,269	234,133	365,406
Repayments on mortgages payable	(141,994)	(2,581)	(68,746)
Proceeds from revolving credit facilities	222,495	107,670	0
Repayments on revolving credit facilities	(207,956)	(40,000)	0
Payments of deferred financing fees	(7,291)	(6,627)	(4,672)
Payments to purchase interest rate caps	(5,174)	0	0
Net proceeds from issuance of Class A common stock	25	57,376	51
Repurchase of Class A common stock	(9,018)	0	0
Net proceeds from issuance of Warrants associated with the Series B Redeemable Preferred Stock	1,699	3,072	275
Payments to redeem Operating Partnership Units	(6)	(46)	(101)
Net cash provided by financing activities	330,077	417,371	491,546
Net (decrease) increase in cash, cash equivalents and restricted cash	(12,346)	(62,859)	46,820
Cash, cash equivalents and restricted cash, beginning of year	64,590	127,449	80,629
Cash, cash equivalents and restricted cash, end of year	52,244	64,590	127,449
Supplemental disclosure of cash flow information
Cash paid for interest (net of interest capitalized)	44,837	28,004	18,095
Supplemental disclosure of non-cash investing and financing activities
Conversion of preferred equity investments to notes receivable	0	(40,760)	0
Distributions payable - declared and unpaid	12,073	14,287	7,328
Mortgages assumed upon property acquisitions	0	173,831	39,054
Mortgages assumed by buyer upon sale of real estate assets	0	(41,419)	0
Capital expenditures held in accounts payable and other accrued liabilities	786	0	0
Reduction of assets from deconsolidation	0	110,402	0
Reduction of mortgages payable from deconsolidation	0	(49,445)	0
Reduction of other liabilities from deconsolidation	0	(6,905)	0
Reduction of noncontrolling interests from deconsolidation	0	22,920	0
Series A Preferred Stock [Member]
Cash flows from financing activities
Proceeds from Redeemable Preferred Stock	0	(173)	68,524
Series B Preferred Stock [Member]
Cash flows from financing activities
Proceeds from Redeemable Preferred Stock	107,877	141,244	18,789
Payments to redeem 6.0% Series B Redeemable Preferred Stock	(136)	(244)	0
Series C Preferred Stock [Member]
Cash flows from financing activities
Proceeds from Redeemable Preferred Stock	0	(148)	55,978
Series D Preferred Stock [Member]
Cash flows from operating activities
Net loss	0	0	0
Cash flows from financing activities
Proceeds from Redeemable Preferred Stock	$ 0	$ (55)	$ 68,760