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Tax Credit Transactions (Textual) (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 30, 2008 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Aug. 27, 2010 USD ($) | Nov. 17, 2008 ft²
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Tax credit transaction income |  |  | $ (19,955) | $ (11,853) | $ (11,853) |  |
Deferred Costs |  |  | $ 101,419 | 101,261 |  |  |
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 non-controlling interest |  | 2.00% | 2.00% |  |  |  |
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 |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period |  |  | over the five year credit recapture period as defined in the Internal Revenue Code |  |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period in years |  |  | 5 years |  |  |  |
Accretion of non-controlling interest liability |  |  | $ 1,100 | 1,100 | $ 1,100 |  |
Historic Tax Credit Transaction [Member] | Other Liabilities [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Preferred return |  | $ 1,000 |  |  |  |  |
Historic Tax Credit Transaction [Member] | Other Assets [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Deferred Costs |  |  | 0 | 500 |  |  |
Historic Tax Credit Transaction [Member] | U S B [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Agreed contribution in project cost |  |  |  |  |  | $ 64,100 |
USB contributions |  |  | $ 0 | 15,100 |  |  |
New Markets Tax Credit Transaction [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Percentage of tax credit recapture |  |  | 100.00% |  |  |  |
Tax credit transaction income | $ 8,000 |  | $ 8,100 |  |  |  |
Recognition of cash received as revenue net of allocated expenses on or after September 2011, period in years |  |  | 7 years |  |  |  |
Percentage of qualified investments | 39.00% |  |  |  |  |  |
New Markets Tax Credit Transaction [Member] | Other Assets [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Deferred Costs |  |  | $ 0 | 5,300 |  |  |
New Markets Tax Credit Transaction [Member] | U S B [Member] |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
USB contributions |  |  | $ 13,300 | $ 13,000 |  |  |

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