CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009		Dec. 31, 2008
OPERATING ACTIVITIES:
Net income	$ 49,443		$ 46,053		$ 44,360
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization - continuing and discontinued operations	19,623		16,109		14,822
Stock-based compensation expense	1,467		1,285		1,389
Gain on sale of assets, net			(310)
Straight-line rental income - continuing and discontinued operations	(3,728)	[1]	(3,822)	[1]	(4,241)	[1]
Provisions for doubtful accounts - continuing and discontinued operations	(13)		2,010		775
Non-cash interest related to earn-out liabilities	464
Other non-cash items, net	1,675		1,231		851
Decrease in interest receivable	56		95		91
Increase in prepaid, other assets and allowance	(490)		(310)		(285)
Increase (decrease) in accrued interest payable	681		573		(149)
Increase in accrued expenses and other liabilities	1,657		2,411		2,727
Net cash provided by operating activities	70,835		65,325		60,340
INVESTING ACTIVITIES:
Investment in real estate properties and capital improvements, net	(103,855)		(100,424)		(16,984)
Proceeds from sale of real estate investments, net			4,864
Investment in real estate mortgages			(1,694)		(221)
Principal payments received on mortgage loans receivable	5,967		8,403		7,843		4,642
Advances under notes receivable	(232)		(100)		(375)
Principal payments received on notes receivable	731		1,573		671
Net cash used in investing activities	(97,389)		(87,378)		(9,066)
FINANCING ACTIVITIES:
Bank borrowings	167,600		83,700		19,000
Repayment of bank borrowings	(149,300)		(59,500)		(5,500)
Proceeds from issuance of senior unsecured notes	50,000		50,000
Principal payments on mortgage loan payable and bonds payable	(530)		(8,180)		(24,843)
Proceeds from common stock offering	103,631		67,793		766
Repurchase of common stock					(16)
Repurchase of preferred stock					(2,000)
Redemption of preferred stock	(88,413)		(59,065)
Distributions paid to stockholders	(56,572)		(53,902)		(51,373)
Distributions paid to non-controlling interests	(191)		(210)		(305)
Debt issue costs	(2,286)		(718)		(35)
Stock option exercises	120		182		770
Net cash provided by (used in) financing activities	24,059		20,100		(63,536)
Decrease in cash and cash equivalents	(2,495)		(1,953)		(12,262)
Cash and cash equivalents, beginning of year	6,903		8,856		21,118
Cash and cash equivalents, end of year	4,408		6,903		8,856		21,118
Supplemental disclosure of cash flow information:
Interest paid	$ 5,025		$ 1,628		$ 2,177

[1] During 2011, 2010 and 2009, we recorded $238, $342, and $443, respectively, in straight-line rental income from a lessee that qualifies as a related party because the lessee's Chief Executive Officer is on our Board of Directors. See Note 12. Transactions with Related Party for further discussion.