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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Consolidated debt obligations |  |
Plus: premiums/(discounts), net | $ (5,329) |
Less: deferred financing costs | (8,889) |
Outstanding indebtedness | 2,078,255 | $ 2,028,046
Secured Debt |  |
Consolidated debt obligations |  |
Long-term debt, gross | 317,363 | 323,032
Plus: premiums/(discounts), net | (1,477) | (1,759)
Less: deferred financing costs | (283) | (404)
Total mortgage indebtedness | 315,603 | 320,869
Unsecured Debt |  |
Consolidated debt obligations |  |
Long-term debt, gross | 1,775,110 | 1,721,110
Plus: premiums/(discounts), net | (3,852) | (4,096)
Less: deferred financing costs | (8,606) | (9,837)
Total unsecured indebtedness | 1,762,652 | 1,707,177
Unsecured Debt | $600 million Unsecured Credit Facility |  |
Consolidated debt obligations |  |
Long-term debt, gross | 146,500 | 92,500
Unsecured Debt | Seven-Year Term Loan - Swapped to fixed |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 250,000 | 250,000
Effective interest rate | 2.87% |
Unsecured Debt | $350.0M 3.95% Guaranteed Notes due 2023 |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 350,000 | 350,000
Effective interest rate | 3.87% |
Unsecured Debt | $250.0M 4.10% Guaranteed Notes due 2024 |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 250,000 | 250,000
Effective interest rate | 4.33% |
Unsecured Debt | $450.0M 3.95% Guaranteed Notes due 2027 |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 450,000 | 450,000
Effective interest rate | 4.03% |
Unsecured Debt | $250.0M 4.55% Guaranteed Notes due 2029 |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 250,000 | 250,000
Effective interest rate | 4.60% |
Unsecured Debt | Indenture IA (Preferred Trust I) |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 27,062 | 27,062
Unsecured Debt | Indenture IB (Preferred Trust I) - Swapped to fixed |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 25,774 | 25,774
Effective interest rate | 3.30% |
Unsecured Debt | Indenture II (Preferred Trust II) - Swapped to fixed |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 25,774 | 25,774
Effective interest rate | 3.09% |
LIBOR | Unsecured Debt | $600 million Unsecured Credit Facility |  |
Consolidated debt obligations |  |
Spread on variable rate | 1.10% |
LIBOR | Unsecured Debt | Indenture IA (Preferred Trust I) |  |
Consolidated debt obligations |  |
Spread on variable rate | 1.25% |
Two Logan Square | Secured Debt |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 81,535 | 82,805
Effective interest rate | 3.98% |
Four Tower Bridge | Secured Debt |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 9,351 | 9,526
Effective interest rate | 4.50% |
One Commerce Square | Secured Debt |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 117,486 | 120,183
Effective interest rate | 3.64% |
Two Commerce Square | Secured Debt |  |
Consolidated debt obligations |  |
Long-term debt, gross | $ 108,991 | $ 110,518
Effective interest rate | 4.51% |

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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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