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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Nov. 09, 2017
Consolidated debt obligations |  |  |  |
Plus: premiums/(discounts), net |  | $ (5,855) |  |
Net deferred financing costs |  | (10,241) |  |
Total Debt Obligations |  | 2,028,046 | $ 1,930,828 |
Secured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | 323,032 | 320,107 |
Plus: premiums/(discounts), net |  | (1,759) | (2,325) |
Net deferred financing costs |  | (404) | (566) |
Total mortgage indebtedness |  | 320,869 | 317,216 |
Secured Debt [Member] | Two Logan Square [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 82,805 | 84,440 |
Effective interest rate |  | 3.98% |  |
Debt instrument maturity date |  | May 01, 2020 |  |
Secured Debt [Member] | Four Tower Bridge [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 9,526 | 0 |
Effective interest rate | [1] | 4.50% |  |
Debt instrument maturity date |  | Feb. 28, 2021 |  |
Secured Debt [Member] | One Commerce Square [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 120,183 | 123,667 |
Effective interest rate |  | 3.64% |  |
Debt instrument maturity date |  | Apr. 05, 2023 |  |
Secured Debt [Member] | Two Commerce Square [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 110,518 | 112,000 |
Effective interest rate |  | 4.51% |  |
Debt instrument maturity date |  | Apr. 05, 2023 |  |
Unsecured Debt [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 1,721,110 | 1,628,610 |
Plus: premiums/(discounts), net |  | (4,096) | (4,423) |
Net deferred financing costs |  | (9,837) | (10,575) |
Total unsecured indebtedness |  | 1,707,177 | 1,613,612 |
Unsecured Debt [Member] | $600 million Unsecured Credit Facility [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 92,500 | 0 |
Debt instrument, description of variable rate basis |  | LIBOR + 1.10% |  |
Spread on variable rate |  | 1.10% |  |
Debt instrument maturity date |  | Jul. 15, 2022 |  |
Unsecured Debt [Member] | Seven Year Term Loan - Swapped to fixed [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 | 250,000 |
Effective interest rate | [2] | 2.87% |  |
Debt instrument maturity date |  | Oct. 08, 2022 |  |
Unsecured Debt [Member] | $350M 3.95% Guaranteed Notes due 2023 [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 350,000 | 350,000 |
Effective interest rate |  | 3.87% |  |
Debt instrument maturity date |  | Apr. 15, 2018 |  |
Unsecured Debt [Member] | $250.0M 4.10% Guaranteed Notes due 2024 [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 | 250,000 |
Effective interest rate |  | 4.33% |  |
Debt instrument maturity date |  | Feb. 15, 2023 |  |
Unsecured Debt [Member] | $450.0M 3.95% Guaranteed Notes due 2027 [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 450,000 | 450,000 | $ 450,000
Effective interest rate |  | 4.03% |  |
Debt instrument maturity date |  | Oct. 01, 2024 |  |
Unsecured Debt [Member] | $250M 4.55% Guaranteed Notes due 2029 [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 250,000 | 250,000 |
Effective interest rate |  | 4.60% |  |
Debt instrument maturity date |  | Oct. 01, 2029 |  |
Unsecured Debt [Member] | Indenture IA (Preferred Trust I) [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 27,062 | 27,062 |
Debt instrument, description of variable rate basis |  | LIBOR + 1.25% |  |
Spread on variable rate |  | 1.25% |  |
Debt instrument maturity date |  | Mar. 30, 2035 |  |
Unsecured Debt [Member] | Indenture IB (Preferred Trust I) - Swapped to fixed [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 25,774 | 25,774 |
Effective interest rate |  | 3.30% |  |
Debt instrument maturity date |  | Apr. 30, 2035 |  |
Unsecured Debt [Member] | Indenture II (Preferred Trust II) - Swapped to fixed [Member] |  |  |  |
Consolidated debt obligations |  |  |  |
Long-term Debt, Gross |  | $ 25,774 | $ 25,774 |
Effective interest rate |  | 3.09% |  |
Debt instrument maturity date |  | Jul. 30, 2035 |  |
[1] | This loan was assumed upon acquisition of the related property on January 5, 2018. The interest rate reflects the market rate at the time of acquisition.
[2] | On December 13, 2018, the Company amended and restated its $250.0 million seven-year term loan maturing October 8, 2022. In connection with the terms of the amendment, the credit spread on the term loan decreased from LIBOR plus 1.80% to LIBOR plus 1.25%, reducing the Company’s effective interest rate by 0.55%. Through a series of interest rate swaps, the $250.0 million outstanding balance of the term loan has a fixed interest rate of 2.87%.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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