CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net loss	$ (31,784)	$ (68,093)	$ (52,511)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	122,985	105,945	63,112
Amortization of loan costs	4,082	3,762	2,921
Accretion of note origination costs			60
Amortization of above and below market intangibles	753	915	345
Straight-line rent adjustments	(6,251)	(4,309)	(2,472)
Unrealized (gain) loss from mark-to-market adjustments on swaps	(18)	33
Loss on extinguishment of debt	368	986
Contingent purchase price consideration adjustment	(290)	(589)	(630)
Equity in earnings of unconsolidated entities, net of distributions	460	1,486	2,931
Impairment provision		4,661
Loss on lease terminations	785	863
Gain on sale of real estate	(15,415)
Gain on purchase of controlling interest in unconsolidated entity			(2,798)
Bad debt expense	346	1,170
Changes in operating assets and liabilities:
Other assets	(2,024)	1,406	(1,791)
Deferred rent and lease incentives	(5,386)	(13,156)	(1,016)
Due from related parties			(155)
Accounts payable and accrued liabilities	(1,272)	6,423	7,235
Other liabilities	4,350	1,586	5,038
Due to related parties	1,715	428	(997)
Net cash flows provided by operating activities	73,404	43,517	19,272
Investing activities:
Acquisition of properties	(28,088)	(866,340)	(869,458)
Development of properties	(95,142)	(73,552)	(47,150)
Proceeds from sale of real estate	33,629
Issuance of note receivable to related party			(2,065)
Collection of note receivable from related party			5,591
Distribution from unconsolidated entities			2,206
Purchase of controlling interest in unconsolidated entity			(1,584)
Investment in unconsolidated entities			(220)
Receipt of contingent purchase price consideration	367
Changes in restricted cash	(2,435)	466	(7,914)
Capital expenditures	(7,362)	(8,029)	(4,021)
Payment of leasing costs	(2,846)	(2,806)	(543)
Deposits on real estate		(500)	(500)
Net cash used in investing activities	(101,877)	(950,761)	(925,658)
Financing activities:
Subscriptions received for common stock through public offering		551,876	554,608
Payment of stock issuance and offering costs	(32)	(58,983)	(58,880)
Distributions to stockholders, net of distribution reinvestments	(31,454)	(26,373)	(14,203)
Redemptions of common stock	(28,585)	(7,441)	(2,246)
Contribution from redeemable noncontrolling interest			568
Contribution from noncontrolling interest		71	400
Distributions to holder of noncontrolling interest	(38)	(23)
Distribution to holder of promoted interest	(4,650)		(2,000)
Draws under revolving credit facilities	105,113	775,000	367,223
Repayments on revolving credit facilities	(120,250)	(321,403)	(259,320)
Proceeds from mortgage and other notes payable	157,620	95,570	402,438
Principal payments on mortgage and other notes payable	(54,272)	(115,818)	(27,012)
Lender deposits			(150)
Contingent purchase price consideration payment	(2,992)
Purchase of interest rate cap	(587)	(2,251)
Payment of loan costs	(1,805)	(5,414)	(7,894)
Net cash flows provided by financing activities	18,068	884,811	953,532
Net increase (decrease) in cash	(10,405)	(22,433)	47,146
Cash at beginning of period	68,922	91,355	44,209
Cash at end of period	58,517	68,922	91,355
Supplemental disclosure of cash flow information:
Cash paid during the period for interest, net of capitalized interest of approximately $2.5 million, $2.0 million and $0.9 million, respectively	50,762	37,621	26,724
Cash paid for income taxes	1,140	702	545
Amounts incurred but not paid (including amounts due to related parties):
Stock issuance and offering costs		32	1,656
Loan costs	26	136	310
Accrued development costs	12,497	11,251	7,951
Redemptions payable	10,397	2,739	872
Noncontrolling interests non-cash contributions		1,035
Contingent purchase price consideration	4,644	7,500	268
Loan cost amortization capitalized on development properties	320	382	73
Distribution to holder of promoted interest	$ 2,000
Assumption of liabilities on acquired property		6,905	1,000
Assumption of mortgage note payable on acquired property		$ 7,128	$ 27,657