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Basis of Presentation - Summary of Revenue Earned by Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | $ 134,998 |  | $ 128,438 | $ 405,142 |  | $ 387,149
Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | 64,352 |  |  | 190,478 |  |
Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | 34,745 |  |  | 103,960 |  |
Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | 22,754 |  |  | 69,012 |  |
Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | 8,641 |  |  | 25,474 |  |
Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | 3,707 |  |  | 13,187 |  |
Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Total revenue |  | 799 | [1] | 2,408 | 3,031 | [1] | 6,888
Base Rent [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 98,591 |  |  | 291,762 |  |
Base Rent [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 42,289 |  |  | 121,940 |  |
Base Rent [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 29,116 |  |  | 88,929 |  |
Base Rent [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 20,635 |  |  | 61,575 |  |
Base Rent [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 5,008 |  |  | 14,442 |  |
Base Rent [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 2,035 |  |  | 6,340 |  |
Base Rent [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue | [1] | (492) |  |  | (1,464) |  |
Straight Line Rent [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 2,534 |  |  | 10,765 |  |
Straight Line Rent [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 1,912 |  |  | 9,194 |  |
Straight Line Rent [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 1,202 |  |  | 2,208 |  |
Straight Line Rent [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | (492) |  |  | (645) |  |
Straight Line Rent [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | (43) |  |  | 164 |  |
Straight Line Rent [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 65 |  |  | 189 |  |
Straight Line Rent [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue | [1] | (110) |  |  | (345) |  |
Point of Sale [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 6,455 |  |  | 19,070 |  |
Point of Sale [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 5,905 |  |  | 17,526 |  |
Point of Sale [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 73 |  |  | 201 |  |
Point of Sale [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 287 |  |  | 783 |  |
Point of Sale [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 134 |  |  | 385 |  |
Point of Sale [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 56 |  |  | 175 |  |
Point of Sale [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue | [1] | 0 |  |  | 0 |  |
Rents [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 107,580 |  | 102,557 | 321,597 |  | 307,446
Rents [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 50,106 |  |  | 148,660 |  |
Rents [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 30,391 |  |  | 91,338 |  |
Rents [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 20,430 |  |  | 61,713 |  |
Rents [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 5,099 |  |  | 14,991 |  |
Rents [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 2,156 |  |  | 6,704 |  |
Rents [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue | [1] | (602) |  |  | (1,809) |  |
Tenant Reimbursements [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 20,557 |  | 17,239 | 59,094 |  | 53,812
Tenant Reimbursements [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 13,087 |  |  | 37,585 |  |
Tenant Reimbursements [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 3,704 |  |  | 10,795 |  |
Tenant Reimbursements [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 902 |  |  | 2,687 |  |
Tenant Reimbursements [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 2,286 |  |  | 6,258 |  |
Tenant Reimbursements [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 698 |  |  | 2,124 |  |
Tenant Reimbursements [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue | [1] | (120) |  |  | (355) |  |
Termination Fees [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 498 |  | $ 200 | 1,630 |  | $ 2,013
Termination Fees [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 37 |  |  | 192 |  |
Termination Fees [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 461 |  |  | 1,300 |  |
Termination Fees [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 0 |  |  | 138 |  |
Termination Fees [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 0 |  |  | 0 |  |
Termination Fees [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue |  | 0 |  |  | 0 |  |
Termination Fees [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Lease revenue | [1] | 0 |  |  | 0 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 4,944 |  |  | 17,531 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 203 |  |  | 632 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 6 |  |  | 18 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 1,279 |  |  | 4,130 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 1,223 |  |  | 4,155 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 846 |  |  | 4,345 |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue | [1] | 1,387 |  |  | 4,251 |  |
Other Income [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 1,419 |  |  | 5,290 |  |
Other Income [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 919 |  |  | 3,409 |  |
Other Income [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 183 |  |  | 509 |  |
Other Income [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 143 |  |  | 344 |  |
Other Income [Member] | Austin, Texas [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 33 |  |  | 70 |  |
Other Income [Member] | Other [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 7 |  |  | 14 |  |
Other Income [Member] | Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |
Service and other revenue | [1] | $ 134 |  |  | $ 944 |  |
[1] | Corporate includes intercompany eliminations necessary to reconcile to consolidated Company totals.

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