CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
OPERATING ACTIVITIES:
Net income	$ 51,327		$ 49,443		$ 46,053
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization-continuing and discontinued operations	22,153		19,623		16,109
Stock-based compensation expense	1,819		1,467		1,285
Gain on sale of assets, net	(16)				(310)
Straight-line rental income-continuing and discontinued operations	(3,264)	[1]	(3,728)	[1]	(3,822)	[1]
(Recovery) provisions for doubtful accounts	(101)		(13)		2,010
Non-cash interest related to earn-out liabilities	439		464
Other non-cash items, net	1,330		1,299		881
Decrease in interest receivable	535		56		95
Increase in accrued interest payable	1,923		681		573
Net change in other assets and liabilities	545		1,167		2,101
Net cash provided by operating activities	76,690		70,459		64,975
INVESTING ACTIVITIES:
Investment in real estate properties, net	(166,750)		(100,294)		(94,250)
Investment in real estate developments, net	(9,957)		(50)
Investment in real estate capital improvements, net	(1,132)		(3,135)		(5,824)
Proceeds from sale of real estate investments, net	1,271				4,864
Investment in real estate mortgages	(7,719)				(1,694)
Principal payments received on mortgage loans receivable	21,633		5,967		8,403
Proceeds from redemption of marketable securities	6,500
Advances under notes receivable	(2,930)		(232)		(100)
Principal payments received on notes receivable	569		731		1,573
Net cash used in investing activities	(158,515)		(97,013)		(87,028)
FINANCING ACTIVITIES:
Bank borrowings	153,500		167,600		83,700
Repayment of bank borrowings	(94,000)		(149,300)		(59,500)
Proceeds from issuance of senior unsecured notes	85,800		50,000		50,000
Principal payments on mortgage loan payable and bonds payable	(565)		(530)		(8,180)
Debt issue costs	(1,426)		(2,286)		(718)
Proceeds from common stock offering			103,631		67,793
Stock option exercises	1,926		120		182
Distributions paid to stockholders	(57,785)		(56,572)		(53,902)
Redemption of preferred stock			(88,413)		(59,065)
Redemption of non-controlling interests	(2,764)
Distributions paid to non-controlling interests	(78)		(191)		(210)
Net cash provided by financing activities	84,608		24,059		20,100
Increase (decrease) in cash and cash equivalents	2,783		(2,495)		(1,953)
Cash and cash equivalents, beginning of year	4,408		6,903		8,856
Cash and cash equivalents, end of year	7,191		4,408		6,903
Supplemental disclosure of cash flow information:
Interest paid	$ 7,452		$ 5,070		$ 1,745

[1] During 2012, 2011 and 2010, we recorded $131, $238, and $342, 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.