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Dispositions of Property (Details) - USD ($) $ in Thousands									1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 06, 2017	Dec. 16, 2016	Apr. 05, 2016	Dec. 09, 2015	May 13, 2015	Mar. 31, 2015	Feb. 23, 2015	Dec. 03, 2014	Jun. 30, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gain (loss) on sale of property
Gain (loss) on sale of property											$ (2,938)	$ 23,662	$ 940
Asset held for sale											$ 3,871
Office Property In Federal Way Washington | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Gain (loss) on sale of property
Provision for loss on property held									$ 4,800	$ 500
Gain (loss) on sale of property										5,300
Asset held for sale									$ 9,300	$ 8,800
Office Property In Federal Way Washington | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Net Proceeds		$ 7,300
Gain (Loss) on sale of properties		$ 7,100
Office Property In Maryland Heights Missouri | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property			$ 4,200
Office Property In Milpitas, California | Subsequent Events
Gain (loss) on sale of property
Gain (loss) on sale of property	$ 2,300
Net Proceeds	6,200
Office Property In Milpitas, California | Disposal group disposed of by sale, not classified as discontinued operations | Subsequent Events
Gain (loss) on sale of property
Gain (loss) on sale of property	$ 2,300
Office Property in Plano, Texas | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property							$ 1,500
Office Property in Eden Prairie, Minnesota | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property						$ 9,000
Office Property in Charlotte, North Carolina | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property					$ 900
Office Property in San Jose, California | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property				$ 12,300
Office Property in Colorado Springs, Colorado | Disposal group disposed of by sale, not classified as discontinued operations
Gain (loss) on sale of property
Gain (loss) on sale of property								$ 900

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
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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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