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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
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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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