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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities    
Net income $ 5,181 $ 4,688
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization, including amounts in discontinued operations 25,994 25,249
Provision for losses on accounts receivable 1,098 1,341
Real estate impairment 0 599
Amortization of share grants, net 1,429 1,270
Amortization of debt premiums, discounts and related financing costs 968 785
Changes in operating other assets (3,953) (10,392)
Changes in operating other liabilities 4,842 9,021
Net cash provided by operating activities 35,559 32,561
Cash flows from investing activities    
Real estate acquisitions, net 0 (126,947)
Capital improvements to real estate (10,459) (3,690)
Development in progress (780) (33)
Non-real estate capital improvements (210) (105)
Net cash used in investing activities (11,449) (130,775)
Cash flows from financing activities    
Line of credit borrowings 20,000 78,000
Line of credit repayments (10,000) (18,000)
Dividends paid (28,900) (28,590)
Net contributions from (distributions to) noncontrolling interests 22 (25)
Proceeds from dividend reinvestment program 1,242 1,367
Principal payments - mortgage notes payable (1,453) (1,005)
Net proceeds from exercise of share options 23 180
Net cash provided by and (used in) financing activities (19,066) 31,927
Net increase (decrease) in cash and cash equivalents 5,044 (66,287)
Cash and cash equivalents at beginning of year 12,765 78,767
Cash and cash equivalents at end of period 17,809 12,480
Supplemental disclosure of cash flow information:    
Cash paid for interest, net of amounts capitalized $ 12,215 $ 12,062