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Debt - Summary of Outstanding Indebtedness (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Oct. 02, 2017
Notes Payable, Excluding Defeased Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 2,350,519 | $ 2,439,311 |
Unamortized deferred financing costs and loan discounts | (17,724) | (17,931) |
TOTAL NOTES PAYABLE, NET | 2,332,795 | 2,421,380 |
Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | 1,985,000 | 1,975,000 |
Unsecured Debt | Term Loan A |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 300,000 | 300,000 |
Unsecured Debt | Term Loan A | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.20% |  |
Unsecured Debt | Term Loan A | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.70% |  |
Unsecured Debt | Term Loan C |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 75,000 | 75,000 |
Unsecured Debt | Term Loan C | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.30% |  |
Unsecured Debt | Term Loan C | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 2.20% |  |
Unsecured Debt | Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 350,000 | 350,000 |
Unsecured Debt | Term Loan B | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.20% |  |
Unsecured Debt | Term Loan B | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.70% |  |
Unsecured Debt | Term Loan D |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 125,000 | 125,000 |
Unsecured Debt | Term Loan D | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.20% |  |
Unsecured Debt | Term Loan D | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.70% |  |
Unsecured Debt | Series A Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 110,000 | 110,000 |
Interest rate | 4.34% |  |
Unsecured Debt | Series E Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 50,000 | 50,000 |
Interest rate | 3.66% |  |
Unsecured Debt | Series B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 259,000 | 259,000 |
Interest rate | 4.69% |  |
Unsecured Debt | Series D Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 150,000 | 150,000 |
Interest rate | 3.98% |  |
Unsecured Debt | Registered Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 400,000 | 400,000 | $ 400,000
Interest rate | 3.95% |  |
Unsecured Debt | Series C Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 56,000 | 56,000 |
Interest rate | 4.79% |  |
Unsecured Debt | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 110,000 | $ 100,000 |
Unsecured Debt | Revolving Credit Facility | LIBOR | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.05% | 1.15% |
Unsecured Debt | Revolving Credit Facility | LIBOR | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.50% | 1.85% |
Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 365,519 | $ 464,311 |
Secured Debt | Sunset Gower/Sunset Bronson |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 5,001 | 5,001 |
Secured Debt | Sunset Gower/Sunset Bronson | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 2.25% |  |
Secured Debt | Met Park North |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 64,500 | 64,500 |
Secured Debt | Met Park North | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.55% |  |
Secured Debt | 10950 Washington |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 27,018 | 27,418 |
Interest rate | 5.32% |  |
Secured Debt | Element LA |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 168,000 | 168,000 |
Interest rate | 4.59% |  |
Secured Debt | Hill7 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 101,000 | 101,000 |
Interest rate | 3.38% |  |
Secured Debt | Rincon Center |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amounts | $ 0 | 98,392 |
Interest rate | 5.13% |  |
In-Substance Defeased Debt |  |  |
Debt Instrument [Line Items] |  |  |
TOTAL NOTES PAYABLE, NET | $ 139,003 | $ 0 |

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