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Dispositions of Property (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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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 |  |  |  |  |

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