Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES
Net income	$ 21,099	$ 15,687
Adjustments to reconcile income from operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(4,360)	(3,593)
Depreciation and amortization	50,902	50,614
Amortization of debt issuance costs and debt fair value adjustments	3,046	2,949
Stock-based compensation expense	2,571	2,119
Settlement of forward interest rate swap agreement	1,617	0
Other, net	(839)	804
Changes in operating assets and liabilities
Change in restricted cash	(1,438)	(1,549)
Change in accounts receivable	(195)	(1,019)
Change in other assets	(168)	(68)
Change in accounts payable and accrued expenses	7,298	8,071
Change in security deposits payable	113	154
Change in other liabilities and deferred credits	1,751	321
Net cash provided by operating activities	81,397	74,490
INVESTING ACTIVITIES
Capital expenditures	(94,877)	(33,503)
Change in restricted cash	(1,272)	305
Leasing commissions	(2,805)	(1,977)
Net cash used in investing activities	(98,954)	(35,175)
FINANCING ACTIVITIES
Change in restricted cash	0	(1,400)
Repayment of secured notes payable	(1,169)	(2,749)
Proceeds from term loan	100,000	0
Repayment of line of credit	(93,000)	0
Debt issuance costs	(1,957)	0
Proceeds from issuance of common stock, net	104,148	24,790
Dividends paid to common stock and unitholders	(39,988)	(36,645)
Deferred offering costs	0	(68)
Shares withheld for employee taxes	(4,319)	0
Net cash (used in) provided by financing activities	63,715	(16,072)
Net increase (decrease) in cash and cash equivalents	46,158	23,243
Cash and cash equivalents, beginning of period	48,987	42,479
Cash and cash equivalents, end of period	$ 95,145	$ 65,722