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Sale of Building (Details) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Oct. 02, 2018 USD ($) ft² | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | [1]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Assets held for sale |  |  | $ 0 | $ 5,220 | [1] |
Gain on sale |  |  | 4,396 |  |  | $ 0
Minnetonka, MN |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Area of real estate sold (in sqft) | ft² |  | 130,000 |  |  |  |
Proceeds from sale of buildings |  | $ 10,000 |  |  |  |
Assets held for sale | [1] |  |  | 5,200 |  |
Tax benefit related to sale of building |  |  |  | $ 1,100 |  |
Gain on sale |  |  | 4,400 |  |  |
Gain on sale, net of deferred tax |  |  | 3,400 |  |  |
Hopkins, MN |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Payment for leasehold improvements |  |  | $ 1,200 |  |  |
Leasehold Improvements | Hopkins, MN |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Useful life |  |  | 13 years |  |  |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.

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