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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 6 Months Ended |  |  |  |  |
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Jun. 30, 2014 acre Room Buildings sqft Real_Estate_Ventures | Jun. 30, 2013 Real_Estate_Ventures | Dec. 31, 2013 | Jun. 30, 2014 Austin Joint Venture [Member] | Jun. 30, 2014 TB-BDN Plymouth Apartments [Member] | Jun. 30, 2014 Unconsolidated Real Estate Ventures [Member] sqft | Jun. 30, 2013 Unconsolidated Real Estate Ventures [Member] sqft | Jun. 30, 2014 The Grove at Cira Centre South [Member] | Jun. 30, 2014 PJP VII [Member] | Apr. 03, 2014 Four Points Centre [Member] Storey Properties sqft
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of floors of a building |  |  |  |  |  |  |  |  |  | 3
Company's share of equity (Company's Basis) | $ 186,042,000 |  | $ 180,512,000 | $ (1,200,000) |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | 17 | 17 |  |  |  |  |  |  |  |
Net rentable square feet |  |  |  |  |  | 5,900,000 | 6,200,000 |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  |  |  | 2
Net Rentable Space |  |  |  |  |  |  |  |  |  | 192,396
Number of real estate ventures that owns buildings | 11 |  |  |  |  |  |  |  |  |
Number of office buildings in Real Estate Ventures | 56 |  |  |  |  |  |  |  |  |
Aggregate Approximate Area Of Office Buildings | 5,900,000 |  |  |  |  |  |  |  |  |
Number of real estate ventures that owns undeveloped land | 2 |  |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land | 3.8 |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments | 3,095,000 | 12,568,000 |  |  |  |  |  |  |  |
Number of real estate ventures that owns land under development | 3 |  |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture in Parcels Of Land Under Development | 22.5 |  |  |  |  |  |  |  |  |
Number of real estate ventures developed hotel property | 1 |  |  |  |  |  |  |  |  |
Number Of Rooms Contain In One Real Estate Venture Developed As Hotel Property | 137 |  |  |  |  |  |  |  |  |
Minimum Percentage Of Unconsolidated Equity Method Investment Ownership | 20.00% |  |  |  |  |  |  |  |  |
Maximum Percentage Of Unconsolidated Equity Method Investment Ownership | 65.00% |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  |  |  | $ 3,200,000 |  |  | $ 24,700,000 | $ 500,000 |

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