Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 36,021	$ 35,278
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,973	6,761
Straight-line rental income	(2,695)	(1,077)
Write-off of debt issuance costs	353	0
Loan impairment	4,037	0
Net realized gains on sales of marketable securities	0	(30)
Share-based compensation	1,833	1,679
Income from equity-method investee	91	0
Change in operating assets and liabilities:
Equity-method investment and other assets	(728)	(252)
Accounts payable and accrued expenses	326	(457)
Deferred income	(104)	(30)
Net cash provided by operating activities	47,925	41,872
Cash flows from investing activities:
Investment in mortgage and other notes receivable	(500)	(5,262)
Collection of mortgage and other notes receivable	15,484	1,735
Investment in real estate	(83,179)	(24,298)
Investment in real estate development	3,905	0
Investment in renovations of existing real estate	3,336	0
Real estate purchase deposit	(2,500)	0
Proceeds from sales of marketable securities	0	125
Net cash used in investing activities	(77,936)	(27,700)
Cash flows from financing activities:
Net change in borrowings under revolving credit facilities	103,000	(97,300)
Borrowings on term loan	80,000	120,000
Repayment of term loan	(80,000)	0
Debt issuance costs	(1,231)	(753)
Proceeds from exercise of stock options	(146)	0
Distributions to noncontrolling interest	(441)	0
Dividends paid to stockholders	(44,166)	(42,205)
Net cash provided by (used in) financing activities	57,308	(20,258)
(Decrease) increase in cash and cash equivalents	27,297	(6,086)
Cash and cash equivalents, beginning of year	9,172	15,886
Cash and cash equivalents, end of year	36,469	9,800
Supplemental disclosure of cash flow information:
Interest Paid	2,282	1,373
Supplemental schedule of non-cash investing and financing activities:
Conditional consideration in asset acquisition	1,600	0
Assumption of debt in real estate acquisition	80,528	0
Change in fair value of cash flow hedge	1,107	(907)
Assignment of net assets in equity-method investee	$ 817	$ 0