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Summary of Significant Accounting Policies - Summary of Revenue Earned by Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | [1] | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 139,203 | $ 134,998 | $ 133,786 | $ 136,358 | $ 133,344 | $ 128,438 | $ 127,791 | $ 130,920 | $ 544,345 |  | $ 520,493 | $ 525,463
Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 256,717 |  |  |
Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 138,279 |  |  |
Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 90,308 |  |  |
Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 38,665 |  |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 16,757 |  |  |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 3,619 | [2] | 9,363 | 7,155
Base Rent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 392,048 |  |  |
Base Rent [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 164,369 |  |  |
Base Rent [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 118,628 |  |  |
Base Rent [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 80,858 |  |  |
Base Rent [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 21,757 |  |  |
Base Rent [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 8,400 |  |  |
Base Rent [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue | [2] |  |  |  |  |  |  |  |  | (1,964) |  |  |
Straight Line Rent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 13,009 |  |  |
Straight Line Rent [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 11,867 |  |  |
Straight Line Rent [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 2,851 |  |  |
Straight Line Rent [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | (1,577) |  |  |
Straight Line Rent [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 116 |  |  |
Straight Line Rent [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 201 |  |  |
Straight Line Rent [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue | [2] |  |  |  |  |  |  |  |  | (449) |  |  |
Point of Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 25,599 |  |  |
Point of Sale [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 23,528 |  |  |
Point of Sale [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 258 |  |  |
Point of Sale [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 1,062 |  |  |
Point of Sale [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 521 |  |  |
Point of Sale [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 230 |  |  |
Point of Sale [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue | [2] |  |  |  |  |  |  |  |  | 0 |  |  |
Rents [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 430,656 |  | 412,333 | 421,505
Rents [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 199,764 |  |  |
Rents [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 121,737 |  |  |
Rents [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 80,343 |  |  |
Rents [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 22,394 |  |  |
Rents [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 8,831 |  |  |
Rents [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue | [2] |  |  |  |  |  |  |  |  | (2,413) |  |  |
Tenant Reimbursements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 82,625 |  | 72,620 | 70,629
Tenant Reimbursements [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 51,572 |  |  |
Tenant Reimbursements [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 14,440 |  |  |
Tenant Reimbursements [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 3,519 |  |  |
Tenant Reimbursements [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 10,736 |  |  |
Tenant Reimbursements [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 2,832 |  |  |
Tenant Reimbursements [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue | [2] |  |  |  |  |  |  |  |  | (474) |  |  |
Termination Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 1,763 |  | $ 2,370 | $ 2,339
Termination Fees [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 192 |  |  |
Termination Fees [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 1,435 |  |  |
Termination Fees [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 136 |  |  |
Termination Fees [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 0 |  |  |
Termination Fees [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  |  | 0 |  |  |
Termination Fees [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue | [2] |  |  |  |  |  |  |  |  | 0 |  |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 22,557 |  |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 855 |  |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 25 |  |  |
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 |  |  |  |  |  |  |  |  |  | 5,793 |  |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 5,455 |  |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 4,951 |  |  |
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue | [2] |  |  |  |  |  |  |  |  | 5,478 |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 6,744 |  |  |
Other Income [Member] | Philadelphia CBD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 4,334 |  |  |
Other Income [Member] | Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 642 |  |  |
Other Income [Member] | Metropolitan Washington, D.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 517 |  |  |
Other Income [Member] | Austin, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 80 |  |  |
Other Income [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue |  |  |  |  |  |  |  |  |  | 143 |  |  |
Other Income [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service and other revenue | [2] |  |  |  |  |  |  |  |  | $ 1,028 |  |  |
[1] | The increase in fourth quarter revenues primarily relates to the acquisition of the Austin Portfolio, located in Austin, Texas, on December 11, 2018. See Note 3, “Real Estate Investments,” for further information on this transaction.
[2] | Corporate includes intercompany eliminations necessary to reconcile to consolidated Company totals.

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