Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (308)	$ (7,805)
Adjustment to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	49,508	28,486
Loss on impairment		4,563
Non-cash portion of interest expense	783	755
Intangible amortization in rental income, net	4,399	3,481
Straight-line rent adjustments, net	(2,139)	(1,733)
Gain on interest rate swaps		(215)
Loss on extinguishment of debt		929
Gain on sales of real estate	(464)	(219)
Non-cash compensation expense	2,227	1,457
Issuance of units for acquisition fee		225
Change in assets and liabilities:
Tenant accounts receivable, net	(1,399)	(317)
Leasing commissions, net	(1,453)	(567)
Restricted cash	(764)	(943)
Prepaid expenses and other assets	(1,611)	(716)
Accounts payable, accrued expenses and other liabilities	3,539	2,308
Tenant prepaid rent and security deposits	2,270	492
Due from related parties	626	25
Total adjustments	55,522	38,011
Net cash provided by operating activities	55,214	30,206
Cash flows from investing activities:
Additions of land and building improvements	(183,882)	(159,951)
Proceeds from sales of rental property, net	4,843	3,216
Restricted cash	(549)	3,339
Cash paid for deal deposits, net	(460)	(3,675)
Additions to lease intangibles	(54,842)	(54,239)
Net cash used in investing activities	(234,890)	(211,310)
Cash flows from financing activities:
Proceeds from sale of Series B Preferred stock	70,000
Proceeds from credit facility		124,300
Repayment of credit facility		(124,300)
Proceeds from unsecured credit facility	90,000	12,000
Repayment of unsecured credit facility	(169,300)
Proceeds from unsecured term loans	100,000	100,000
Proceeds from mortgage notes payable		9,252
Repayment of mortgage notes payable	(3,151)	(143,985)
Payment of loan fees and costs	(1,511)	(2,833)
Dividends and distributions	(47,671)	(24,296)
Proceeds from sales of common stock	154,669	237,568
Offering costs	(8,457)	(10,863)
Restricted cash - escrow for dividends		(1,553)
Net cash provided by financing activities	184,579	175,290
Increase (decrease) in cash and cash equivalents	4,903	(5,814)
Cash and cash equivalents-beginning of period	19,006	16,498
Cash and cash equivalents-end of period	$ 23,909	$ 10,684