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Subsequent Events - Acquisition (Details) $ in Thousands			6 Months Ended
	Jul. 06, 2016 USD ($)	Jul. 01, 2016 USD ($) ft²	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2015 USD ($) ft²
Subsequent Event [Line Items]
Area of real estate property (in square feet) | ft²			820,587	223,679
Payments to purchase office building			$ 0	$ 1,764,596
Proceeds from repayment of notes receivable			$ 28,892	$ 0
Subsequent Event | 11601 Wilshire Boulevard Office Building
Subsequent Event [Line Items]
Area of real estate property (in square feet) | ft²		500,475
Payments to purchase office building		$ 311,000
Proceeds from repayment of notes receivable		$ 28,500
Area of leased property | ft²		6,638
Operating leases, term of contract		8 years
Annual rent cost per year		$ 279
Subsequent Event | 3.98% Guaranteed Notes, Due 2026 | Senior Notes | 11601 Wilshire Boulevard Office Building
Subsequent Event [Line Items]
Proceeds from issuance of long-term debt	$ 150,000	$ 150,000
Debt instrument, stated interest rate	3.98%	3.98%
Subsequent Event | 3.66% Guaranteed Notes, Due 2023 | Senior Notes | 11601 Wilshire Boulevard Office Building
Subsequent Event [Line Items]
Proceeds from issuance of long-term debt	$ 50,000
Debt instrument, stated interest rate	3.66%

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