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Historic Tax Credit (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Aug. 27, 2010 USD ($) | Nov. 17, 2008 ft²
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Tax credit transaction income | $ (11,853) | $ (11,853) | $ (11,853) | $ (11,853) |  |  |
Historic Tax Credit Transaction [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Area Of IRS Campus Building | ft² |  |  |  |  |  |  | 862,692
Percentage Of Building Leased To IRS |  |  |  |  |  |  | 100.00%
Purchase Price for Non-controlling Interest Obligation Put Option |  |  | $ 3,200 |  |  |  |
Rate of Return on Noncontrolling Interest |  |  | 2.00% |  |  |  |
Accretion of Non Controlling Interest Liability |  |  | $ 1,100 |  | $ 1,100 |  |
Percentage Of Tax Credit Recapture |  |  | 20.00% |  |  |  |
Tax credit transaction income |  |  | $ 11,900 |  |  |  |
Other Income (Expense) |  |  | (500) |  |  |  |
Contribution allocated in non controlling interest |  |  |  |  | 3,000 |  |
Deferred Costs | 0 |  | 0 |  | 500 |  |
U S B [Member] | Historic Tax Credit Transaction [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Agreed contribution in project cost |  |  |  |  |  | $ 64,100 |
USB contributions | $ 0 |  | 0 |  | $ 15,100 |  |
Other Liabilities [Member] | Historic Tax Credit Transaction [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Preferred Return |  |  | $ 1,000 |  |  |  |

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