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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Consolidated debt obligations |  |
Plus: premiums/(discounts), net | $ (5,503) |
Less: deferred financing costs | (9,341) |
Total Debt Obligations | 2,096,536 | $ 2,028,046
Secured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | 319,270 | 323,032
Plus: premiums/(discounts), net | (1,570) | (1,759)
Less: deferred financing costs | (323) | (404)
Total mortgage indebtedness | 317,377 | 320,869
Secured Debt [Member] | Two Logan Square [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 81,962 | 82,805
Effective interest rate | 3.98% |
Debt instrument maturity date | May 31, 2020 |
Secured Debt [Member] | Four Tower Bridge [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 9,410 | 9,526
Effective interest rate | 4.50% |
Debt instrument maturity date | Feb. 28, 2021 |
Secured Debt [Member] | One Commerce Square [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 118,393 | 120,183
Effective interest rate | 3.64% |
Debt instrument maturity date | Apr. 30, 2023 |
Secured Debt [Member] | Two Commerce Square [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 109,505 | 110,518
Effective interest rate | 4.51% |
Debt instrument maturity date | Apr. 30, 2023 |
Unsecured Debt [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 1,792,110 | 1,721,110
Plus: premiums/(discounts), net | (3,933) | (4,096)
Less: deferred financing costs | (9,018) | (9,837)
Total unsecured indebtedness | 1,779,159 | 1,707,177
Unsecured Debt [Member] | $600 million Unsecured Credit Facility [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 163,500 | 92,500
Debt instrument, description of variable rate basis | LIBOR + 1.10% |
Spread on variable rate | 1.10% |
Debt instrument maturity date | Jul. 31, 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 | 2.87% |
Debt instrument maturity date | Oct. 31, 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 | Feb. 28, 2023 |
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 | Oct. 31, 2024 |
Unsecured Debt [Member] | $450.0M 3.95% Guaranteed Notes due 2027 [Member] |  |
Consolidated debt obligations |  |
Long-term Debt, Gross | $ 450,000 | 450,000
Effective interest rate | 4.03% |
Debt instrument maturity date | Nov. 30, 2027 |
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. 31, 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. 31, 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. 31, 2035 |

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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=119400593&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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