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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current: |  |  |
State | $ 375 | $ 312 | $ 300
Total | 375 | 312 | 300
Income tax provision | 375 | 312 | 300
Reconciliation of effective tax rate and the U.S. federal statutory income tax rate |  |  |
Taxes at statutory U.S. federal income tax rate (as a percent) | 35.00% | 35.00% | 35.00%
Nontaxable income of SNH (as a percent) | (35.00%) | (35.00%) | (35.00%)
State and local income taxes, net of federal tax benefit (as a percent) | 0.30% | 0.20% | 0.30%
Change in valuation allowance (as a percent) | 2.40% | 0.40% |
Other differences, net (as a percent) | (2.40%) | (0.40%) |
Effective tax rate (as a percent) | 0.30% | 0.20% | 0.30%
Deferred tax assets: |  |  |
Deferred revenue | 2,169 | 489 |
Tax loss carry forwards | 1,751 | 241 |
Deferred tax assets, gross | 3,920 | 730 |
Valuation allowance | (3,814) | (617) |
Deferred tax assets, net | 106 | 113 |
Deferred tax liabilities: |  |  |
Depreciable assets | (106) | (113) |
Percentage of valuation allowance provided | 100.00% | 100.00% |
Net operating loss carry forwards for federal income tax purposes | $ 4,502 |  |

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