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Dispositions of Property (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 20, 2017	Jan. 06, 2017	Sep. 30, 2017	Dec. 31, 2017	Jun. 30, 2017
Gain (loss) on sale of property
Gain (loss) on sale of property				$ (18,481)
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Office Property in Baltimore Maryland
Gain (loss) on sale of property
Assets Held-for-sale, Not Part of Disposal Group			$ 31,600		$ 31,900
Loss contingency on property held			20,700		$ 20,500
Provision for loss on property held			$ 300
Disposal group disposed of by sale, not classified as discontinued operations | Office Property In Milpitas, California
Gain (loss) on sale of property
Gain (loss) on sale of property		$ 2,300
Disposal group disposed of by sale, not classified as discontinued operations | Office Property in Baltimore Maryland
Gain (loss) on sale of property
Gain (loss) on sale of property	$ (20,800)
Net Proceeds	$ 31,600

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of loss contingency liability.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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