Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 2,379	$ 29,398
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,038	25,275
Provision for losses on accounts receivable	441	441
Gain on sale of real estate	0	(30,277)
Share-based compensation expense	1,546	1,852
Amortization of debt premiums, discounts and related financing costs	837	872
Changes in operating other assets	(906)	(932)
Changes in operating other liabilities	1,137	9,075
Net cash provided by operating activities	31,472	35,704
Cash flows from investing activities
Net cash received for sale of real estate	0	37,013
Capital improvements to real estate	(4,716)	(4,781)
Development in progress	(1,119)	(6,390)
Real estate deposits, net	(12,500)	0
Cash released from (held in) replacement reserve escrows	2,309	(996)
Non-real estate capital improvements	(13)	(1,376)
Net cash (used in) provided by investing activities	(16,039)	23,470
Cash flows from financing activities
Line of credit borrowings (repayments)	110,000	(20,000)
Dividends paid	(41,137)	(20,519)
Principal payments – mortgage notes payable	(84,219)	(1,155)
Borrowings under construction loan	0	1,845
Payment of financing costs	(236)	(238)
Distributions to noncontrolling interests	91	0
Net proceeds from equity offering	0	5,091
Net cash used in financing activities	(15,683)	(34,976)
Net (decrease) increase in cash and cash equivalents	(250)	24,198
Cash and cash equivalents at beginning of period	23,825
Cash and cash equivalents at end of period	23,575	40,025
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized	8,639	7,531
Decrease in accrued capital improvements and development costs	$ 4,214	$ 4,104