Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (1,427)	$ 21
Adjustment to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	26,129	19,854
Non-cash portion of interest expense	299	315
Intangible amortization in rental income, net	2,065	1,510
Straight-line rent adjustments, net	(1,293)	(1,024)
Gain on sale of real estate		(50)
Non-cash compensation expense	1,847	1,090
Change in assets and liabilities:
Tenant accounts receivable, net	(468)	966
Restricted cash	(162)	(174)
Prepaid expenses and other assets	(3,105)	(2,324)
Accounts payable, accrued expenses and other liabilities	(2,242)	(5,752)
Tenant prepaid rent and security deposits	164	98
Due from related parties	9	(2)
Total adjustments	23,243	14,507
Net cash provided by operating activities	21,816	14,528
Cash flows from investing activities:
Acquisitions of land and buildings and improvements	(48,621)	(29,368)
Additions to building and other capital improvements	(2,644)	(2,232)
Proceeds from sale of rental property, net		473
Restricted cash	(165)	167
Acquisition deposits, net	(480)	(340)
Additions to deferred leasing intangibles	(14,795)	(7,540)
Net cash used in investing activities	(66,705)	(38,840)
Cash flows from financing activities:
Redemption of common units for cash	(64)	(342)
Proceeds from unsecured credit facility	62,000	38,000
Repayment of unsecured credit facility	(120,000)	(96,500)
Proceeds from unsecured term loans		50,000
Proceeds from unsecured notes	120,000
Repayment of mortgage notes payable	(12,942)	(1,101)
Payment of loan fees and costs	(930)	(1,169)
Dividends and distributions	(25,314)	(18,838)
Proceeds from sales of common stock	10,133	77,568
Offering costs	(184)	(1,270)
Net cash provided by financing activities	32,699	46,348
Increase (decrease) in cash and cash equivalents	(12,190)	22,036
Cash and cash equivalents-beginning of period	23,878	6,690
Cash and cash equivalents-end of period	11,688	28,726
Supplemental disclosure:
Cash paid for interest	6,990	5,420
Supplemental schedule of non-cash investing and financing activities
Issuance of units for acquisition of land and buildings and improvements	(16,873)
Issuance of units for acquisition of deferred leasing intangibles	5,029
Acquisition of land and buildings and improvements	(25,936)
Acquisition of deferred leasing intangibles	(7,731)
Assumption of mortgage notes payable	11,765
Non-cash investing activities included in additions of land and building improvements	1,747	308
Non-cash financing activities included in payment of loan fees and costs	(22)	(144)
Dividends and distributions declared but not paid	$ 7,696	$ 5,818