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Sale of Building (Details)
$ in Thousands
3 Months Ended
Oct. 02, 2018
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale   $ 0 $ 4,396
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    
Gain on sale     4,400
Gain on sale, net of deferred tax     $ 3,400