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Debt Obligations - Consolidated Debt Obligations Outstanding (Parenthetical) (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 07, 2016 USD ($) ft² | Jan. 14, 2016 USD ($) ft² | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Apr. 02, 2016 | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage notes payable, net |  |  |  | $ 344,308 |  | $ 344,308 |  |  | $ 545,753
Loss on early extinguishment of debt - deferred financing costs |  |  |  |  |  | 13,157 | $ 0 |  |
Loss on early extinguishment of debt |  |  | $ (66,600) | 0 | $ 0 | (66,590) | $ 0 |  |
Unsecured Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 195,000 |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 348,100 |  | 348,100 |  |  | 562,695
Secured Debt [Member] | Cira Square and Cira South Garage [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | 265,800 |  |  |  |  |  |
Secured Debt [Member] | Cira Square [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 176,900 |  |  |  |  |  |
Repayment of prepayment charges |  |  | $ 44,500 |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 10, 2030 |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  | $ 10,800 |  |  |  |  |  |
Secured Debt [Member] | Cira South Garage [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | 44,400 |  |  |  |  |  |
Repayments of debt |  |  | 35,500 |  |  |  |  |  |
Repayment of prepayment charges |  |  | $ 8,900 |  |  |  |  |  |
Debt instrument maturity date |  |  | Sep. 10, 2030 |  |  |  |  |  |
Number of Parking Spaces | ft² |  |  | 1,662 |  |  |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  |  | $ 2,400 |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 1,703,610 |  | $ 1,703,610 |  |  | 1,853,529
Effective interest rate |  |  |  |  |  |  |  | 6.00% |
First Mortgage [Member | Mortgage Loans over $1,000,000 [Member] | Office Building at Two Logan Square [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage notes payable, net |  | $ 86,900 |  |  |  |  |  |  |
Net Rentable Square Feet | ft² |  | 708,844 |  |  |  |  |  |  |
Former First Mortgage [Member] | Mortgage Loans over $1,000,000 [Member] | Office Building at Two Logan Square [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 86,600 |  |  |  |  |  |  |
Loan interest rate |  | 7.57% |  |  |  |  |  |  |
Fairview Eleven Tower [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest maintained in mortgage debt |  |  |  | 50.00% |  | 50.00% |  |  |
Fairview Eleven Tower [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | [1] |  |  | $ 20,665 |  | $ 20,665 |  |  | $ 20,838
Debt instrument maturity date | [1] |  |  |  |  | Jan. 01, 2017 |  |  |
Effective interest rate | [1] |  |  | 4.25% |  | 4.25% |  |  |
[1] | Represents the full debt amount of a property in a consolidated real estate venture in which the Company holds a 50% interest.

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