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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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