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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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation Between GAAP Net Income and Taxable Income
Net income per books	$ 5,460	$ (8,998)	$ 5,433	$ 5,738	$ 5,062	$ 3,314	$ 10,381	$ 24,767	$ 7,633	$ 43,524	$ 22,093
Adjustment to book income:
Book depreciation and amortization									55,518	48,439	40,724
Tax depreciation and amortization									(34,047)	(31,409)	(26,901)
Tax basis more than book basis on assets sold									265	(1,281)
Straight line rent adjustment, net									(5,203)	(9,783)	(4,252)
Deferred rent, net									1,224	1,290	275
Non-taxable distributions									(1,114)	(767)	(2,026)
Other, net									1,899	2,728	6,355
Taxable income									26,175	52,741	36,268
Less: Capital gains recognized									(1,514)	(21,951)	(293)
Taxable income subject to distribution requirement									$ 24,661	$ 30,790	$ 35,975
Tax components of the Company's common distributions paid per share
Ordinary income (in dollars per share)									$ 0.31	$ 0.38	$ 0.46
Capital gain (in dollars per share)									$ 0.02	$ 0.27	$ 0.00
Return of capital (in dollars per share)									$ 0.43	$ 0.11	$ 0.30
Total (in dollars per share)									$ 0.76	$ 0.76	$ 0.76
Ordinary income (as a percent)									40.61%	50.79%	60.36%
Capital gain (as a percent)									2.40%	35.17%	0.48%
Return of capital (as a percent)									56.99%	14.04%	39.16%
Total (as a percent)									100.00%	100.00%	100.00%
Capital gains as percentage of total distributions									2.40%	29.78%	0.48%
Capital gain tax rate (as a percent)									15.00%	15.00%	15.00%

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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 Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256



Reference 2: 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.

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