Condensed Consolidating Financial Information (Summary Of Condensed Consolidated Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities
Net cash provided by (used in) operating activities	$ 23,352	$ 19,286
Investing Activities
Real estate acquired	(671)	(173,486)
Principal received on loans receivable	1,184	580
Investment in loans receivable direct financing leases, and other investments	(396,500)	(5,463)
Construction in progress and other	(5,422)	(4,647)
Net cash provided by (used in) investing activities	(401,409)	(183,016)
Financing Activities
Revolving credit facilities, net	(89,600)	98,400
Additions to term debt	300,000
Payments of term debt	(58)	(6,945)
Distributions paid	(22,412)	(22,374)
Sale of common stock, net	220,193
Lease deposits and other obligations to tenants	(110)	3,612
Debt issuance costs paid and other financing activities	(6,182)	(361)
Net cash provided by financing activities	401,831	72,332
Increase (decrease) in cash and cash equivalents for period	23,774	(91,398)
Cash and cash equivalents at beginning of period	102,726	98,408
Cash and cash equivalents at end of period	126,500	7,010
Parent [Member]
Operating Activities
Net cash provided by (used in) operating activities	395	(49)
Investing Activities
Investments in and advances to subsidiaries	(198,243)	22,366
Net cash provided by (used in) investing activities	(198,243)	22,366
Financing Activities
Distributions paid	(22,345)	(22,317)
Sale of common stock, net	220,193
Net cash provided by financing activities	197,848	(22,317)
Subsidiary Issuers [Member]
Operating Activities
Net cash provided by (used in) operating activities	(11,062)	(8,847)
Investing Activities
Investments in and advances to subsidiaries	(406,447)	(109,826)
Construction in progress and other	(490)
Net cash provided by (used in) investing activities	(406,937)	(109,826)
Financing Activities
Revolving credit facilities, net	(50,000)	58,000
Additions to term debt	300,000
Payments of term debt		(6,851)
Distributions paid	(22,412)	(22,374)
Sale of common stock, net	220,193
Debt issuance costs paid and other financing activities	(6,162)	(225)
Net cash provided by financing activities	441,619	28,550
Increase (decrease) in cash and cash equivalents for period	23,620	(90,123)
Cash and cash equivalents at beginning of period	101,230	96,822
Cash and cash equivalents at end of period	124,850	6,699
Subsidiary Guarantors [Member]
Operating Activities
Net cash provided by (used in) operating activities	32,317	19,492
Investing Activities
Real estate acquired	(671)	(168,589)
Investments in and advances to subsidiaries	174,658	147,823
Investment in loans receivable direct financing leases, and other investments	(200,000)
Construction in progress and other	(6,304)	(3,064)
Net cash provided by (used in) investing activities	(32,317)	(23,830)
Financing Activities
Payments of term debt		(70)
Lease deposits and other obligations to tenants	155	3,032
Net cash provided by financing activities	155	2,962
Increase (decrease) in cash and cash equivalents for period	155	(1,376)
Cash and cash equivalents at beginning of period	1,409	1,387
Cash and cash equivalents at end of period	1,564	11
Non-Guarantor Subsidiaries [Member]
Operating Activities
Net cash provided by (used in) operating activities	1,702	8,690
Investing Activities
Real estate acquired		(4,897)
Principal received on loans receivable	1,184	580
Investments in and advances to subsidiaries	232,184	(38,046)
Investment in loans receivable direct financing leases, and other investments	(196,500)	(5,463)
Construction in progress and other	1,372	(1,583)
Net cash provided by (used in) investing activities	38,240	(49,409)
Financing Activities
Revolving credit facilities, net	(39,600)	40,400
Payments of term debt	(58)	(24)
Lease deposits and other obligations to tenants	(265)	580
Debt issuance costs paid and other financing activities	(20)	(136)
Net cash provided by financing activities	(39,943)	40,820
Increase (decrease) in cash and cash equivalents for period	(1)	101
Cash and cash equivalents at beginning of period	87	199
Cash and cash equivalents at end of period	86	300
Eliminations [Member]
Investing Activities
Investments in and advances to subsidiaries	197,848	(22,317)
Net cash provided by (used in) investing activities	197,848	(22,317)
Financing Activities
Distributions paid	22,345	22,317
Sale of common stock, net	(220,193)
Net cash provided by financing activities	(197,848)	22,317
Total Consolidated [Member]
Operating Activities
Net cash provided by (used in) operating activities	23,352	19,286
Investing Activities
Real estate acquired	(671)	(173,486)
Principal received on loans receivable	1,184	580
Investment in loans receivable direct financing leases, and other investments	(396,500)	(5,463)
Construction in progress and other	(5,422)	(4,647)
Net cash provided by (used in) investing activities	(401,409)	(183,016)
Financing Activities
Revolving credit facilities, net	(89,600)	98,400
Additions to term debt	300,000
Payments of term debt	(58)	(6,945)
Distributions paid	(22,412)	(22,374)
Sale of common stock, net	220,193
Lease deposits and other obligations to tenants	(110)	3,612
Debt issuance costs paid and other financing activities	(6,182)	(361)
Net cash provided by financing activities	401,831	72,332
Increase (decrease) in cash and cash equivalents for period	23,774	(91,398)
Cash and cash equivalents at beginning of period	102,726	98,408
Cash and cash equivalents at end of period	$ 126,500	$ 7,010