Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss	$ (602)	$ (2,889)
Adjustment to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	32,045	18,132
Loss on impairment		622
Non-cash portion of interest expense	515	498
Intangible amortization in rental income, net	2,875	2,258
Straight-line rent adjustments, net	(1,507)	(1,269)
Gain on interest rate swaps		(215)
Gain on extinguishment of debt		(18)
Gain on sales of real estate	(464)	(219)
Non-cash compensation expense	1,485	976
Issuance of units for acquisition fee		225
Change in assets and liabilities:
Tenant accounts receivable, net	(77)	101
Leasing commissions, net	(1,420)	(359)
Restricted cash	(421)	(689)
Prepaid expenses and other assets	(1,633)	(653)
Accounts payable, accrued expenses and other liabilities	969	(35)
Tenant prepaid rent and security deposits	1,429	1,152
Due from related parties	550	(43)
Total adjustments	34,346	20,464
Net cash provided by operating activities	33,744	17,575
Cash flows from investing activities:
Additions of land and building improvements	(120,458)	(86,992)
Proceeds from sale of rental property, net	4,843	3,216
Restricted cash	(837)	(1,173)
Cash received (paid) for deal deposits, net	(100)	35
Additions to lease intangibles	(38,422)	(25,950)
Net cash used in investing activities	(154,974)	(110,864)
Cash flows from financing activities:
Proceeds from sale of series B preferred stock	70,000
Proceeds from credit facility		87,300
Repayment of credit facility		(82,300)
Proceeds from unsecured credit facility	65,000
Repayment of unsecured credit facility	(164,300)
Proceeds from unsecured term loans	75,000
Proceeds from mortgage notes payable		9,252
Repayment of mortgage notes payable	(1,965)	(18,592)
Payment of loan fees and costs	(1,487)	(477)
Dividends and distributions	(27,634)	(14,009)
Proceeds from sales of common stock	117,739	107,387
Offering costs	(7,847)	(5,104)
Restricted cash - escrow for dividends	(2,519)	(1,553)
Net cash provided by financing activities	121,987	81,904
Increase (decrease) in cash and cash equivalents	757	(11,385)
Cash and cash equivalents-beginning of period	19,006	16,498
Cash and cash equivalents-end of period	$ 19,763	$ 5,113