Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement of Cash Flows [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$ (3,137,000)	$ 1,373,000
Cash flows from operating activities:
Net income	49,434,000	36,021,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	18,777,000	8,973,000
Amortization	1,081,000	506,000
Straight-line rental income	(8,490,000)	(2,695,000)
Write-off of debt issuance costs	2,145,000	353,000
Loan and realty losses	0	4,037,000
Share-based compensation	1,573,000	1,833,000
Income from equity-method investee	(210,000)	(91,000)
Change in operating assets and liabilities:
Equity-method investment and other assets	(381,000)	(1,234,000)
Accounts payable and accrued expenses	177,000	326,000
Deferred income	(2,486,000)	(104,000)
Net cash provided by operating activities	61,620,000	47,925,000
Cash flows from investing activities:
Investment in mortgage and other notes receivable	(1,214,000)	(500,000)
Collection of mortgage and other notes receivable	999,000	15,484,000
Investment in real estate	(29,423,000)	(83,179,000)
Investment in real estate development	(3,320,000)	(3,905,000)
Investment in renovations of existing real estate	(2,076,000)	(3,336,000)
Receipt of earnest money deposit	0	(2,500,000)
Payment of real estate purchase liability	1,600,000	0
Net cash used in investing activities	(36,634,000)	(77,936,000)
Cash flows from financing activities:
Net change in borrowings under revolving credit facilities	(51,000,000)	103,000,000
Proceeds from convertible senior notes	200,000,000	0
Borrowings on term loan	130,000,000	80,000,000
Payments on term loans	(250,526,000)	(80,000,000)
Debt issuance costs	(7,007,000)	(1,231,000)
Proceeds from exercise of stock options	0	(146,000)
Distributions to noncontrolling interest	(865,000)	(441,000)
Dividends paid to stockholders	(49,743,000)	(44,166,000)
Net cash provided by (used in) financing activities	(29,141,000)	57,308,000
(Decrease) increase in cash and cash equivalents	(4,155,000)	27,297,000
Cash and cash equivalents, beginning of year	11,312,000	9,172,000
Cash and cash equivalents, end of year	7,157,000	36,469,000
Supplemental disclosure of cash flow information:
Interest Paid	8,886,000	2,201,000
Supplemental schedule of non-cash investing and financing activities:
Tax deferred exchange funds applied to investment in real estate	23,813,000	0
Conditional consideration in asset acquisition	3,000,000	1,600,000
Accounts payable related to investments in real estate	2,103,000	0
Assumption of debt in real estate acquisition	0	80,528,000
Assignment of net assets in equity-method investee	$ 0	$ 817,000