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COMMITMENTS AND CONTINGENCIES - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 02, 2015 USD ($) | Sep. 30, 2004 USD ($) | Dec. 31, 2019 USD ($) a ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  | $ 596,007,000 | $ 370,319,000 |
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition |  |  | 15 years |  |
Prentiss Properties Trust | Commerce Square |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Non-controlling interest, ownership percentage by non-controlling Owners |  |  | 1.00% |  |
618 Market Street |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Contingent consideration, liability | $ 2,000,000.0 |  | $ 1,970,000 |  |
Fair value of contingent consideration | 1,600,000 |  |  |  |
Interest expense | $ 2,000,000.0 |  |  |  |
Drexel Square |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Required spending in capital improvements to property |  |  | 8,500,000 |  |
Estimated potential additional contribution obligation |  |  | $ 2,800,000 |  |
Two Logan Square |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
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 |  |  | $ 2,900,000 |  |
Liability related to acquisition of TRC |  | $ 700,000 | 2,900,000 |  |
One Commerce Square |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Tax guarantee obligation |  |  | 125,000,000.0 |  |
Two Commerce Square |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Tax guarantee obligation |  |  | 100,000,000.0 |  |
Mortgage Lenders |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Associated letter of credit |  |  | 0 |  |
Unconsolidated Real Estate Ventures |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  | 596,007,000 |  |
4040 Wilson Venture |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  | 114,845,000 | $ 57,288,000 |
Secured construction loan with total borrowing capacity |  |  |  |  | $ 150,000,000.0
4040 Wilson Venture | 4040 Wilson Venture |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Secured construction loan with total borrowing capacity |  |  | 150,000,000.0 |  |
Guarantees, maximum exposure amount |  |  | $ 41,300,000 |  |
Radnor PA Property |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Rentable square feet | ft² |  |  | 170,000 |  |
Acres | a |  |  | 7.8 |  |
Building purchase price |  |  | $ 20,300,000 |  |
Land purchase price |  |  | 11,300,000 |  |
Payments for deposit on real estate investment |  |  | $ 1,000,000 |  |

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