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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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