Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 6,615	$ 2,379
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,069	26,038
Provision for losses on accounts receivable	183	441
Share-based compensation expense	1,147	1,546
Amortization of debt premiums, discounts and related financing costs	477	837
Changes in operating other assets	(6,922)	(906)
Changes in operating other liabilities	3,469	1,916
Net cash provided by operating activities	31,038	32,251
Cash flows from investing activities
Capital improvements to real estate	(11,436)	(4,716)
Development in progress	(2,517)	(1,119)
Real estate deposits, net	5,000	12,500
Cash released from replacement reserve escrows, net	4,548	2,309
Non-real estate capital improvements	(575)	(13)
Net cash used in investing activities	(14,980)	(16,039)
Cash flows from financing activities
Line of credit borrowings, net	3,000	110,000
Dividends paid	(45,021)	(41,137)
Principal payments – mortgage notes payable	(50,346)	(84,219)
Proceeds from term loan	50,000	0
Payment of financing costs	(234)	(236)
Distributions to noncontrolling interests	(36)	(91)
Proceeds from dividend reinvestment program	1,114	0
Net proceeds from equity offering	29,959	0
Payment of tax withholdings for restricted share awards	(585)	(779)
Net cash used in financing activities	(12,149)	(16,462)
Net increase (decrease) in cash and cash equivalents	3,909	(250)
Cash and cash equivalents at beginning of period	11,305	23,825
Cash and cash equivalents at end of period	15,214	23,575
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized	5,916	8,639
Change in accrued capital improvements and development costs	$ 438	$ 4,214