Income Taxes and Tax Credit Transactions	12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES AND TAX CREDIT TRANSACTIONS	15. INCOME TAXES AND TAX CREDIT TRANSACTIONS Income Tax Provision/Benefit The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to the differences between the financial statement carrying amounts of existing assets and liabilities and their respective income tax bases, and for net operating loss, capital loss and tax credit carryforwards. The deferred tax assets and liabilities are measured using the enacted income tax rates in effect for the year in which those temporary differences are expected to be realized or settled. The effect on the deferred tax assets and liabilities from a change in tax rates is recognized in earnings in the period when the new rate is enacted. However, deferred tax assets are recognized only to the extent that it is more likely than not that they will be realized based on consideration of all available evidence, including the future reversals of existing taxable temporary differences, future projected taxable income and tax planning strategies. Valuation allowances are provided if, based upon the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. As of December 31, 2017, net deferred tax assets totaled $0.6 million and are included in the “Other assets” caption within the Company’s consolidated balance sheets. There was a nominal amount of deferred tax assets at December 31, 2016 included in the “Other Assets” caption within the Company’s consolidated balance sheets. In projecting future taxable income, the analysis begins with historical results and incorporates assumptions about the amount of future state and federal pretax operating income adjusted for items that do not have tax consequences. The assumptions about future taxable income require significant judgment and are consistent with the plans and estimates the Company is using to manage the underlying businesses. The Company considered all available evidence, both positive and negative, including a cumulative loss in recent years and its current forecast of future income in its analysis. While the Company believes its forecast of future taxable income is reasonable, it is inherently uncertain. If the Company’s projections of future income are lower than expected, the Company may need to establish a valuation allowance. The Company had no accruals for tax uncertainties as of December 31, 2017 and December 31, 2016. For the year ended December 31, 2017, there were $0.6 million of deferred income tax benefits. For the years ended December 31, 2016 and December 31, 2015, there were nominal amounts of income tax expense. 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, an 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 was entitled to substantially all of the benefits derived from the tax rehabilitation credits available under section 47 of the Internal Revenue Code. USB did not have a material interest in the underlying economics of the property. This transaction included a put/call provision whereby the Company was 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 noncontrolling 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 obligated the Company to deliver tax benefits and provide other guarantees to USB and that entitled 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, were consideration that the Company received 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 were recognized as revenue in the consolidated financial statements beginning when the obligation to USB was relieved which occurred upon delivery of the expected tax benefits net of any associated costs. The tax credit was 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 the 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 the consolidated statement of operations. As of December 31, 2017 and 2016, there were no USB contributions presented in the Company’s balance sheet Direct and incremental costs incurred in structuring the transaction were deferred and were recognized as an expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. There were no deferred costs at December 31, 2016 and 2017. Amounts included in interest expense related to the accretion of the noncontrolling interest liability and the 2% return expected to be paid to USB on its noncontrolling interest aggregates to $1.1 million for the year ended December 31, 2015. There was no interest accretion for the year ended December 31, 2016. 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 received 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 put option was exercised during 2017 and the Company’s obligation was relieved. 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 consolidated balance sheets at December 31, 2017 and 2016. 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, 2017 and December 31, 2016. 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 was 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. During April of 2017, the put/call provision was exercised. As the tax credit transaction income was recognized during December of 2015 and the property was consolidated by the Company prior to December 31, 2016, there was no impact to the consolidated balance sheets and statements of operations for the years ended December 31, 2017 or December 31, 2016.

15. INCOME TAXES AND TAX CREDIT TRANSACTIONS

Income Tax Provision/Benefit

The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to the differences between the financial statement carrying amounts of existing assets and liabilities and their respective income tax bases, and for net operating loss, capital loss and tax credit carryforwards. The deferred tax assets and liabilities are measured using the enacted income tax rates in effect for the year in which those temporary differences are expected to be realized or settled. The effect on the deferred tax assets and liabilities from a change in tax rates is recognized in earnings in the period when the new rate is enacted. However, deferred tax assets are recognized only to the extent that it is more likely than not that they will be realized based on consideration of all available evidence, including the future reversals of existing taxable temporary differences, future projected taxable income and tax planning strategies. Valuation allowances are provided if, based upon the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

As of December 31, 2017, net deferred tax assets totaled $0.6 million and are included in the “Other assets” caption within the Company’s consolidated balance sheets. There was a nominal amount of deferred tax assets at December 31, 2016 included in the “Other Assets” caption within the Company’s consolidated balance sheets.

In projecting future taxable income, the analysis begins with historical results and incorporates assumptions about the amount of future state and federal pretax operating income adjusted for items that do not have tax consequences. The assumptions about future taxable income require significant judgment and are consistent with the plans and estimates the Company is using to manage the underlying businesses. The Company considered all available evidence, both positive and negative, including a cumulative loss in recent years and its current forecast of future income in its analysis. While the Company believes its forecast of future taxable income is reasonable, it is inherently uncertain. If the Company’s projections of future income are lower than expected, the Company may need to establish a valuation allowance.

The Company had no accruals for tax uncertainties as of December 31, 2017 and December 31, 2016.

For the year ended December 31, 2017, there were $0.6 million of deferred income tax benefits. For the years ended December 31, 2016 and December 31, 2015, there were nominal amounts of income tax expense.

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, an 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 was entitled to substantially all of the benefits derived from the tax rehabilitation credits available under section 47 of the Internal Revenue Code. USB did not have a material interest in the underlying economics of the property. This transaction included a put/call provision whereby the Company was 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 noncontrolling 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 obligated the Company to deliver tax benefits and provide other guarantees to USB and that entitled 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, were consideration that the Company received 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 were recognized as revenue in the consolidated financial statements beginning when the obligation to USB was relieved which occurred upon delivery of the expected tax benefits net of any associated costs. The tax credit was 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 the 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 the consolidated statement of operations. As of December 31, 2017 and 2016, there were no USB contributions presented in the Company’s balance sheet

Direct and incremental costs incurred in structuring the transaction were deferred and were recognized as an expense in the consolidated financial statements upon the recognition of the related revenue as discussed above. There were no deferred costs at December 31, 2016 and 2017. Amounts included in interest expense related to the accretion of the noncontrolling interest liability and the 2% return expected to be paid to USB on its noncontrolling interest aggregates to $1.1 million for the year ended December 31, 2015. There was no interest accretion for the year ended December 31, 2016.

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 received 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 put option was exercised during 2017 and the Company’s obligation was relieved.

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 consolidated balance sheets at December 31, 2017 and 2016. 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, 2017 and December 31, 2016.

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 was 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. During April of 2017, the put/call provision was exercised. As the tax credit transaction income was recognized during December of 2015 and the property was consolidated by the Company prior to December 31, 2016, there was no impact to the consolidated balance sheets and statements of operations for the years ended December 31, 2017 or December 31, 2016.