[Line Items] for Accounting Policies [Table]

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Capitalized Costs, Personnel

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Construction Costs Capitalization Period After Substantially Complete

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Number of Real Estate Properties Held for Sale

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Number Of Revenue Streams, Change In Accounting Principle Effective January 1, 2018

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Number Of Revenue Streams Identified

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Operating Lease, Initial Indirect Cost Expense, Commencement Capitalized During Period

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Operating Leases, Lease Revenue And Tenant Reimbursements

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Variable Interest Entity, Number Of Joint Ventures Consolidated

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Variable Interest Entity, Number Of Joint Ventures Meeting Variable Interest Entity Definition

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Variable Interest Entity, Number Of Joint Ventures Not Consolidated

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Summary of Significant Accounting Policies - Narrative (Details)		12 Months Ended
	Nov. 16, 2017	Dec. 31, 2017 USD ($) revenue_stream property joint_venture segment	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)
Accounting Policies [Line Items]
Number of real estate properties, held-for-sale \| property		4	8
Investment in unconsolidated entities		$ 14,240,000	$ 37,228,000
Construction costs capitalization period after substantially complete		1 year
Capitalized personnel costs		$ 10,853,000	9,347,000	$ 7,349,000
Capitalized interest		10,655,000	11,307,000	6,516,000
Impairment of long-lived assets		0	0	0
Net cash provided by operating activities		$ 292,959,000	226,774,000	175,783,000
Number of operating segments \| segment		2
Income tax expense		$ 0
Number of revenue streams identified \| revenue_stream		3
Number of revenue streams to be accounted for under ASC 606 \| revenue_stream		2
Rental revenues and tenant recoveries		$ 675,600,000
Capitalized indirect leasing costs		8,900,000
Future undiscounted minimum lease payments under ground leases		$ 452,825,000
Accounting Standards Update 2016-18
Accounting Policies [Line Items]
Net cash provided by operating activities			$ 7,200,000	$ 900,000
Building and improvements
Accounting Policies [Line Items]
Estimated useful life		39 years
Land improvements
Accounting Policies [Line Items]
Estimated useful life		15 years
Furniture and fixtures \| Minimum
Accounting Policies [Line Items]
Estimated useful life		5 years
Furniture and fixtures \| Maximum
Accounting Policies [Line Items]
Estimated useful life		7 years
VIE, primary beneficiary
Accounting Policies [Line Items]
Number of joint ventures meeting the VIE definition \| joint_venture		3
Number of joint ventures consolidated \| joint_venture		2
VIE, primary beneficiary \| Pinnacle I and II
Accounting Policies [Line Items]
VIE, ownership percentage	65.00%
VIE, primary beneficiary \| 1455 Market
Accounting Policies [Line Items]
VIE, ownership percentage		55.00%
VIE, primary beneficiary \| Hill7
Accounting Policies [Line Items]
VIE, ownership percentage		55.00%
VIE, not primary beneficiary
Accounting Policies [Line Items]
Number of joint ventures not consolidated \| joint_venture		1
VIE, ownership percentage		21.00%