Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Rental Property:
Land	$ 202,930	$ 191,238
Buildings and improvements, net of accumulated depreciation of $117,106 and $105,789, respectively	1,171,160	1,118,938
Deferred leasing intangibles, net of accumulated amortization of $159,206 and $146,026, respectively	254,155	247,904
Total rental property, net	1,628,245	1,558,080
Cash and cash equivalents	11,688	23,878
Restricted cash	7,233	6,906
Tenant accounts receivable, net	18,554	16,833
Prepaid expenses and other assets	26,397	22,531
Interest rate swaps	111	959
Due from related parties	121	130
Total assets	1,692,349	1,629,317
Liabilities:
Unsecured credit facility	73,000	131,000
Unsecured term loans	150,000	150,000
Unsecured notes	300,000	180,000
Mortgage notes payable	224,131	225,347
Accounts payable, accrued expenses and other liabilities	17,543	21,558
Interest rate swaps	4,037	873
Tenant prepaid rent and security deposits	11,644	11,480
Dividends and distributions payable	7,696	7,355
Deferred leasing intangibles, net of accumulated amortization of $7,242 and $6,565, respectively	10,246	10,180
Total liabilities	798,297	737,793
Commitments and contingencies (Note 10)
Equity:
Common stock, par value $0.01 per share, 100,000,000 shares authorized, 64,947,384 and 64,434,825 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	649	644
Additional paid-in capital	949,467	928,242
Common stock dividends in excess of earnings	(229,006)	(203,241)
Accumulated other comprehensive loss	(4,302)	(489)
Total stockholders' equity	855,808	864,156
Noncontrolling interest	38,244	27,368
Total equity	894,052	891,524
Total liabilities and equity	1,692,349	1,629,317
Series A Preferred Stock
Equity:
Preferred stock	69,000	69,000
Series B Preferred Stock
Equity:
Preferred stock	$ 70,000	$ 70,000