Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES
Net income	$ 22,594	$ 51,601	$ 19,324
Results from discontinued operations	0	(37,652)	(5,653)
Income from continuing operations	22,594	13,949	13,671
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(4,997)	(6,967)	(3,735)
Depreciation and amortization	66,775	61,853	55,936
Amortization of debt issuance costs and debt fair value adjustments	3,932	3,911	3,883
Early extinguishment of debt	0	0	25,867
Loan transfer and consent fees	0	0	8,808
Gain on acquisition of controlling interests	0	0	(46,371)
Stock-based compensation expense	2,845	2,852	2,615
Loss from real estate joint ventures	(160)	0	188
Other, net	1,008	2,422	2,666
Changes in operating assets and liabilities
Change in restricted cash	(755)	(1,000)	97
Change in accounts receivable	(45)	63	(3,570)
Change in other assets	(88)	143	(2,040)
Change in accounts payable and accrued expenses	1,167	(1,799)	2,128
Change in security deposits payable	307	(50)	82
Change in other liabilities and deferred credits	151	186	(1,025)
Net cash provided by operating activities of continuing operations	92,734	75,563	59,200
Net cash provided by operating activities of discontinued operations	0	382	6,164
Net cash provided by operating activities	92,734	75,945	65,364
INVESTING ACTIVITIES
Acquisition of real estate, net of cash acquired	0	(273,990)	(231,558)
Capital expenditures	(55,675)	(34,582)	(10,777)
Change in restricted cash, reserves for capital improvements	453	2,557	(3,069)
Cash acquired from acquisition of controlling interests in real estate joint ventures	0	0	15,222
Leasing commissions	(3,032)	(3,456)	(2,444)
Purchase of marketable securities	0	0	(33,103)
Maturity of marketable securities	0	4,384	4,993
Sale of marketable securities	0	23,191	0
Net cash used in investing activities of continuing operations	(58,254)	(281,896)	(260,736)
Net cash provided by investing activities of discontinued operations	0	87,601	29,047
Net cash used in investing activities	(58,254)	(194,295)	(231,689)
FINANCING ACTIVITIES
Change in restricted cash	(1,400)	0	0
Issuance of secured notes payable	0	132,900	84,500
Repayment of secured notes payable	(95,420)	(34,626)	(264,250)
Defeasance costs on repayment of secured notes payable	0	0	(24,345)
Proceeds from unsecured line of credit	93,000	164,000	0
Repayment of unsecured line of credit	0	(164,000)	0
Loan transfer and consent fees paid	0	0	(8,350)
Repayment of unsecured notes payable	0	0	(38,013)
Repayment of notes payable to affiliates	0	0	(19,279)
Debt issuance costs	0	(1,355)	(2,961)
Proceeds from issuance of common stock, net	25,348	0	596,541
Proceeds from private placement of common units	0	0	5,410
Dividends paid to common stock and unitholders	(49,500)	(48,452)	(46,123)
Payments to nonaccredited investors	0	0	(6,075)
Deferred offering costs	0	(361)	0
Distributions to Predecessor's controlling and noncontrolling interests	0	0	(39,960)
Net cash (used in) provided by financing activities	(27,972)	48,106	237,095
Net (decrease) increase in cash and cash equivalents	6,508	(70,244)	70,770
Cash and cash equivalents, beginning of period	42,479	112,723	41,953
Cash and cash equivalents, end of period	$ 48,987	$ 42,479	$ 112,723