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Commitments and Contingencies (Textual) (Details) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2004 USD ($) | Dec. 31, 2015 USD ($) ft² | Dec. 03, 2015 USD ($) | Dec. 31, 2014 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Associated letter of credit |  | $ 10.0 |  | $ 0.0
Leased Area Of Building | ft² |  | 708,844 |  |
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage |  | $ 2.9 |  |
Liability related to acquisition of TRC | $ 0.7 | $ 2.0 |  |
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition |  | 15 years |  |
Subaru of America [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
NTE Amount |  |  | $ 77.3 |
One Commerce Square [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Tax guarantee obligation |  | $ 125.0 |  |
Two Commerce Square [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Tax guarantee obligation |  | $ 100.0 |  |
Prentiss Properties Trust [Member] | Commerce Square [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Non-controlling interest, ownership percentage by non-controlling Owners |  | 1.00% |  |
Minimum [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Lease terms |  | 5 years |  |
Maximum [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Lease terms |  | 75 years |  |

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