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Federal Income Tax Reporting (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation Between GAAP Net Income and Taxable Income
Net income per books	$ 5,062	$ 3,314	$ 10,381	$ 24,767	$ 5,819	$ 4,758	$ 5,954	$ 5,562	$ 43,524	$ 22,093	$ 27,872
Adjustment to book income:
Book depreciation and amortization									48,439	40,724	39,652
Tax depreciation and amortization									(31,409)	(26,901)	(25,057)
Tax basis more than book basis on assets sold									(1,281)
Straight line rent adjustment, net									(9,783)	(4,252)	(1,879)
Deferred rent, net									1,290	275	34
Non-taxable distributions									(767)	(2,026)	(2,435)
Other, net									2,728	6,355	5,445
Taxable income									52,741	36,268	43,632
Less: Capital gains recognized									(21,951)	(293)	(55)
Taxable income subject to distribution requirement									$ 30,790	$ 35,975	$ 43,577
Tax components of the Company's common distributions paid per share
Ordinary income (in dollars per share)									$ 0.38	$ 0.46	$ 0.61
Capital gain (in dollars per share)									$ 0.27	$ 0.00	$ 0.00
Return of capital (in dollars per share)									$ 0.11	$ 0.30	$ 0.15
Total (in dollars per share)									$ 0.76	$ 0.76	$ 0.76
Ordinary income (as a percent)									50.79%	60.36%	80.56%
Capital gain (as a percent)									35.17%	0.48%	0.10%
Return of capital (as a percent)									14.04%	39.16%	19.34%
Total (as a percent)									100.00%	100.00%	100.00%
Capital gains as percentage of total idstributions									29.78%	0.48%	0.10%
Capital gain tax rate (as a percent)									15.00%	15.00%	15.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1377-109256

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