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Dispositions of Property (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Oct. 20, 2017 | Jan. 06, 2017 | Dec. 16, 2016 | Apr. 05, 2016 | Dec. 09, 2015 | May 13, 2015 | Mar. 31, 2015 | Feb. 23, 2015 | Jun. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group |  |  |  |  |  |  |  |  |  |  |  | $ 3,871 |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  | $ (18,481) | $ (2,938) | $ 23,662 |
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 Baltimore Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property | $ (20,800) |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds | $ 31,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Office Property In Milpitas, California | Disposal group disposed of by sale, not classified as discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |  |
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 Federal Way Washington | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group |  |  |  |  |  |  |  |  | $ 9,300 | 8,800 |  |  |  |
Provision for loss on property held |  |  |  |  |  |  |  |  | $ 4,800 | 500 |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  | $ 5,300 |  |  |  |
Office Property In Federal Way Washington | Disposal group disposed of by sale, not classified as discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  | $ (7,100) |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  | $ 7,300 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |

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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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