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Debt Obligations (Textual) (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 14, 2016 USD ($) ft² | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Loss on early extinguishment of debt - deferred financing costs |  | $ 13,157,000 | $ 0 |
Loss on early extinguishment of debt | $ (66,590,000) | (66,590,000) | $ 0 |
Unsecured Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal repayments of debt | 195,000,000 |  |  |
Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Mortgage debt principal payment |  | $ 1,600,000 |  |
Long-term Debt, Weighted Average Interest Rate |  | 4.93% |  | 5.72%
Long-term Debt, Gross |  | $ 348,900,000 |  | $ 562,700,000
Secured Debt [Member] | Cira Square and Cira South Garage [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | 265,800,000 |  |  |
Secured Debt [Member] | Cira Square [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal repayments of debt | 176,900,000 |  |  |
Repayment of prepayment charges | $ 44,500,000 |  |  |
Debt instrument maturity date | Sep. 10, 2030 |  |  |
Loss on early extinguishment of debt - deferred financing costs | $ 10,800,000 |  |  |
Secured Debt [Member] | Cira South Garage [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | 44,400,000 |  |  |
Principal repayments of debt | 35,500,000 |  |  |
Repayment of prepayment charges | $ 8,900,000 |  |  |
Debt instrument maturity date | Sep. 10, 2030 |  |  |
Number of Parking Spaces | ft² | 1,662 |  |  |
Loss on early extinguishment of debt - deferred financing costs | $ 2,400,000 |  |  |
Secured Debt [Member] | Unsecured Line Of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit |  | $ 0 |  |

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- Definition Number of parking space. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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