CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES:
Net income	$ 52,399,000	$ 43,165,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (continuing and discontinued operations)	18,935,000	18,469,000
Stock-based compensation expense	2,326,000	2,050,000
Gain on sale of real estate, net	(1,140,000)	(1,605,000)
Straight-line rental income	(1,921,000)	(3,000,000)
Provision for doubtful accounts	77,000	42,000
Non-cash interest related to earn-out liabilities		256,000
Other non-cash items, net	1,151,000	1,072,000
Decrease in interest receivable	3,000	26,000
Decrease in accrued interest payable	(1,000,000)	(1,203,000)
Net change in other assets and liabilities	(1,545,000)	1,614,000
Net cash provided by operating activities	69,285,000	60,886,000
INVESTING ACTIVITIES:
Investment in real estate properties, net	(450,000)	(2,050,000)
Investment in real estate properties under development	(23,922,000)	(15,369,000)
Investment in real estate capital improvements	(12,178,000)	(6,390,000)
Capitalized interest	(1,216,000)	(718,000)
Proceeds from sale of real estate investments, net	7,707,000	11,001,000
Advances under mortgage loans receivable	(7,549,000)	(2,816,000)
Principal payments received on mortgage loans receivable	1,609,000	1,429,000
Advances under notes receivable	(664,000)	(795,000)
Principal payments received on notes receivable	112,000	2,716,000
Net cash used in investing activities	(36,551,000)	(12,992,000)
FINANCING ACTIVITIES:
Bank borrowings	28,500,000	2,000,000
Repayment of bank borrowings	(30,000,000)	(117,500,000)
Proceeds from issuance of senior unsecured notes	30,000,000
Principal payments on senior unsecured notes	(4,167,000)
Principal payments on bonds payable	(635,000)	(600,000)
Payment of earn-out liabilities		(7,000,000)
Proceeds from common stock offerings		176,260,000
Stock option exercises	277,000	523,000
Distributions paid to stockholders	(55,729,000)	(48,363,000)
Distributions paid to non-controlling interests		(7,000)
Financing costs paid	(162,000)	(37,000)
Other	(7,000)	(23,000)
Net cash (used in) provided by financing activities	(31,923,000)	5,253,000
Increase in cash and cash equivalents	811,000	53,147,000
Cash and cash equivalents, beginning of period	6,778,000	7,191,000
Cash and cash equivalents, end of period	7,589,000	60,338,000
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$ 11,077,000	$ 9,870,000