Consolidated Statements Of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 61,551,000	$ 49,434,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	26,017,000	18,777,000
Amortization	1,709,000	1,081,000
Straight-line rental income	(12,308,000)	(8,490,000)
Write-off of debt issuance costs	0	2,145,000
Loan recovery	(491,000)	0
Share-based compensation	1,697,000	1,573,000
Income from equity-method investee	513,000	(210,000)
Change in operating assets and liabilities:
Equity-method investment and other assets	740,000	(381,000)
Accounts payable and accrued expenses	(1,004,000)	177,000
Deferred income	1,572,000	(2,486,000)
Net cash provided by operating activities	79,996,000	61,620,000
Cash flows from investing activities:
Investment in mortgage and other notes receivable	(52,580,000)	(1,214,000)
Collection of mortgage and other notes receivable	16,765,000	999,000
Investment in real estate	(3,261,000)	(29,423,000)
Investment in real estate development	(4,571,000)	(3,320,000)
Investment in renovations of existing real estate	(1,816,000)	(2,076,000)
Payment of real estate purchase liability	0	(1,600,000)
Net cash used in investing activities	(45,463,000)	(36,634,000)
Cash flows from financing activities:
Net change in borrowings under revolving credit facilities	(273,000,000)	(51,000,000)
Proceeds from convertible senior notes	0	200,000,000
Proceeds from issuance of secured debt	78,084,000	130,000,000
Borrowings on term loan	225,000,000	0
Payments on term loans	(368,000)	(250,526,000)
Debt issuance costs	(2,305,000)	(7,007,000)
Equity offerring costs	(275,000)	0
Proceeds from exercise of stock options	(1,000)	0
Distributions to noncontrolling interest	(869,000)	(865,000)
Dividends paid to stockholders	(60,795,000)	(49,743,000)
Net cash provided by (used in) financing activities	(34,527,000)	(29,141,000)
(Decrease) increase in cash and cash equivalents	6,000	(4,155,000)
Cash and cash equivalents, beginning of year	3,287,000	11,312,000
Cash and cash equivalents, end of year	3,293,000
Supplemental disclosure of cash flow information:
Interest Paid	13,723,000	8,886,000
Supplemental schedule of non-cash investing and financing activities:
Tax deferred exchange funds applied to investment in real estate	0	23,813,000
Conditional consideration in asset acquisition	0	3,000,000
Accounts payable related to investments in real estate	1,112,000	2,103,000
Reclass of note balance into real estate investment	$ 255,000	$ 0