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Dispositions of Properties (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 20, 2017 | Jan. 06, 2017 | Dec. 16, 2016 | Apr. 05, 2016 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  | $ (18,481) | $ (2,938) |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Office Property In Federal Way Washington |  |  |  |  |  |  |  |  |  |
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 |  |  |
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 Maryland Heights Missouri |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ 4,200 |  |  |  |  |  |
Disposal group disposed of by sale, not classified as discontinued operations | Office Property In Federal Way Washington |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  | $ (7,100) |  |  |  |  |  |  |
Net Proceeds |  |  | $ 7,300 |  |  |  |  |  |  |
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 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 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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