Tax Credit Transactions	12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]
TAX CREDIT TRANSACTIONS	16. TAX CREDIT TRANSACTIONS Historic Tax Credit Transaction On November 17, 2008, the Company closed a transaction with US Bancorp (“USB”) related to the historic rehabilitation of the IRS Philadelphia Campus, a 862,692 square foot office building that is 100% leased to the IRS. On August 27, 2010, the Company completed the development of the IRS Philadelphia Campus and the IRS lease commenced. In connection with this completed development project, USB contributed to the Company $64.1 million of total project costs. In exchange for its contributions to the development of the IRS Philadelphia Campus, USB is entitled to substantially all of the benefits derived from the tax rehabilitation credits available under section 47 of the Internal Revenue Code. USB does not have a material interest in the underlying economics of the property. This transaction includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest in the IRS Philadelphia Campus. The put option was exercised on September 30, 2015 and USB's interest in the IRS Philadelphia Campus was assigned to the Company. A purchase price of $3.2 million was attributed to that puttable non-controlling interest obligation, which was funded with available corporate funds. Upon exercise of the put option, the Company funded USB's final 2% preferred return of $1.0 million. Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide other guarantees to USB and that entitle the Company through fee arrangements to receive substantially all available cash flow from the IRS Philadelphia Campus, the Company concluded that the IRS Philadelphia Campus should be consolidated. The Company also concluded that capital contributions received from USB, in substance, are consideration that the Company receives in exchange for its obligation to deliver tax credits and other tax benefits to USB. These receipts other than the amounts allocated to the put obligation will be recognized as revenue in the consolidated financial statements beginning when the obligation to USB is relieved which occurs upon delivery of the expected tax benefits net of any associated costs. The tax credit is subject to 20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus. Beginning September 2011 to September 2015, the Company recognized the cash received as revenue net of allocated expenses over the five year credit recapture period as defined in the Internal Revenue Code within other income (expense) in its consolidated statement of operations. The fifth and final recapture period ended September 30, 2015 and the Company recognized $11.9 million of cash received as revenue, net of $0.5 million of allocated expenses within other income (expense) it its consolidated statement of operations. As of December 31, 2015, there were no USB contributions presented in the Company’s balance sheet. As of December 31, 2014 there were $15.1 million total USB contributions presented in the Company's balance sheet. The contributions were recorded net of the amounts allocated to non-controlling interest for 2014, as described above of $3.0 million at year end December 31, 2014, with the remaining balance presented within deferred income. Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. There were no deferred costs at December 31, 2015. At December 31, 2014, there were $0.5 million of deferred costs recognized and included in other assets in the Company’s consolidated balance sheet. Amounts included in interest expense related to the accretion of the non-controlling interest liability and the 2% return expected to be paid to USB on its non-controlling interest aggregates to $1.1 million for the year ended December 31, 2015 and $1.4 million for each of the years ended December 31, 2014 and 2013. New Markets Tax Credit Transaction On December 30, 2008, the Company entered into a transaction with USB related to the Cira South Garage in Philadelphia, Pennsylvania and expects to receive a net benefit of $8.0 million under a qualified New Markets Tax Credit Program (“NMTC”). The NMTC was provided for in the Community Renewal Tax Relief Act of 2000 (the “Act”) and is intended to induce investment capital in under-served and impoverished areas of the United States. The Act permits taxpayers (whether companies or individuals) to claim credits against their Federal income taxes for up to 39% of qualified investments in qualified, active low-income businesses or ventures. USB contributed $13.3 million into the development of the Cira South Garage and as such it is entitled to substantially all of the benefits derived from the tax credit, but it does not have a material interest in the underlying economics of the Cira South Garage. This transaction also includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest. The Company believes the put will be exercised and an amount attributed to that obligation is included in other liabilities and is being accreted to the expected fixed put price. The said put price is insignificant. Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide various other guarantees to USB, the Company concluded that the investment entities established to facilitate the NMTC transaction should be consolidated. There were no USB contributions presented in the Company's balance sheet at December 31, 2015. At December 31, 2014, the total USB contributions presented in the Company’s balance sheet were $13.0 million. The contributions were recorded net of direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. There were no deferred costs included within other assets on the balance sheet as of December 31, 2015. The deferred cost included within other assets on the balance sheet was $5.3 million as of December 31, 2014. The USB contribution other than the amount allocated to the put obligation was recognized as income in the consolidated financial statements when the tax benefits were delivered on December 30, 2015 without risk of recapture to the tax credit investors and the Company’s obligation is relieved. The NMTC is subject to 100% recapture for a period of seven years from the date that construction of the Cira South Garage commenced as provided in the Internal Revenue Code. The Company recognized the $8.1 million of net cash received as revenue within tax credit transaction income in the year ended December 31, 2015. The Company expects that the put/call provision will be exercised in 2017.

16. TAX CREDIT TRANSACTIONS

Historic Tax Credit Transaction

On November 17, 2008, the Company closed a transaction with US Bancorp (“USB”) related to the historic rehabilitation of the IRS Philadelphia Campus, a 862,692 square foot office building that is 100% leased to the IRS. On August 27, 2010, the Company completed the development of the IRS Philadelphia Campus and the IRS lease commenced. In connection with this completed development project, USB contributed to the Company $64.1 million of total project costs.

In exchange for its contributions to the development of the IRS Philadelphia Campus, USB is entitled to substantially all of the benefits derived from the tax rehabilitation credits available under section 47 of the Internal Revenue Code. USB does not have a material interest in the underlying economics of the property. This transaction includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest in the IRS Philadelphia Campus. The put option was exercised on September 30, 2015 and USB's interest in the IRS Philadelphia Campus was assigned to the Company. A purchase price of $3.2 million was attributed to that puttable non-controlling interest obligation, which was funded with available corporate funds. Upon exercise of the put option, the Company funded USB's final 2% preferred return of $1.0 million.

Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide other guarantees to USB and that entitle the Company through fee arrangements to receive substantially all available cash flow from the IRS Philadelphia Campus, the Company concluded that the IRS Philadelphia Campus should be consolidated. The Company also concluded that capital contributions received from USB, in substance, are consideration that the Company receives in exchange for its obligation to deliver tax credits and other tax benefits to USB. These receipts other than the amounts allocated to the put obligation will be recognized as revenue in the consolidated financial statements beginning when the obligation to USB is relieved which occurs upon delivery of the expected tax benefits net of any associated costs. The tax credit is subject to 20% recapture per year beginning one year after the completion of the IRS Philadelphia Campus. Beginning September 2011 to September 2015, the Company recognized the cash received as revenue net of allocated expenses over the five year credit recapture period as defined in the Internal Revenue Code within other income (expense) in its consolidated statement of operations. The fifth and final recapture period ended September 30, 2015 and the Company recognized $11.9 million of cash received as revenue, net of $0.5 million of allocated expenses within other income (expense) it its consolidated statement of operations. As of December 31, 2015, there were no USB contributions presented in the Company’s balance sheet. As of December 31, 2014 there were $15.1 million total USB contributions presented in the Company's balance sheet. The contributions were recorded net of the amounts allocated to non-controlling interest for 2014, as described above of $3.0 million at year end December 31, 2014, with the remaining balance presented within deferred income.

Direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. There were no deferred costs at December 31, 2015. At December 31, 2014, there were $0.5 million of deferred costs recognized and included in other assets in the Company’s consolidated balance sheet. Amounts included in interest expense related to the accretion of the non-controlling interest liability and the 2% return expected to be paid to USB on its non-controlling interest aggregates to $1.1 million for the year ended December 31, 2015 and $1.4 million for each of the years ended December 31, 2014 and 2013.

New Markets Tax Credit Transaction

On December 30, 2008, the Company entered into a transaction with USB related to the Cira South Garage in Philadelphia, Pennsylvania and expects to receive a net benefit of $8.0 million under a qualified New Markets Tax Credit Program (“NMTC”). The NMTC was provided for in the Community Renewal Tax Relief Act of 2000 (the “Act”) and is intended to induce investment capital in under-served and impoverished areas of the United States. The Act permits taxpayers (whether companies or individuals) to claim credits against their Federal income taxes for up to 39% of qualified investments in qualified, active low-income businesses or ventures.

USB contributed $13.3 million into the development of the Cira South Garage and as such it is entitled to substantially all of the benefits derived from the tax credit, but it does not have a material interest in the underlying economics of the Cira South Garage. This transaction also includes a put/call provision whereby the Company may be obligated or entitled to repurchase USB’s interest. The Company believes the put will be exercised and an amount attributed to that obligation is included in other liabilities and is being accreted to the expected fixed put price. The said put price is insignificant.

Based on the contractual arrangements that obligate the Company to deliver tax benefits and provide various other guarantees to USB, the Company concluded that the investment entities established to facilitate the NMTC transaction should be consolidated. There were no USB contributions presented in the Company's balance sheet at December 31, 2015. At December 31, 2014, the total USB contributions presented in the Company’s balance sheet were $13.0 million. The contributions were recorded net of direct and incremental costs incurred in structuring the transaction are deferred and will be recognized as expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. There were no deferred costs included within other assets on the balance sheet as of December 31, 2015. The deferred cost included within other assets on the balance sheet was $5.3 million as of December 31, 2014.

The USB contribution other than the amount allocated to the put obligation was recognized as income in the consolidated financial statements when the tax benefits were delivered on December 30, 2015 without risk of recapture to the tax credit investors and the Company’s obligation is relieved. The NMTC is subject to 100% recapture for a period of seven years from the date that construction of the Cira South Garage commenced as provided in the Internal Revenue Code. The Company recognized the $8.1 million of net cash received as revenue within tax credit transaction income in the year ended December 31, 2015. The Company expects that the put/call provision will be exercised in 2017.