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Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessee, Lease, Description [Line Items]      
Amount of Lease-related assets and liabilities pre-tax reduction to retained earnings $ 300    
Lease expense $ 8,941 $ 8,400 $ 9,700
Terminate lease 1 year    
2019 $ 4,600    
2020 3,200    
2021 2,100    
2022 1,500    
2023 and thereafter 6,500    
Salt Lake City, Utah [Member]      
Lessee, Lease, Description [Line Items]      
Property, plant, and equipment, net value 17,300    
Gross cost 20,800    
Accumulated depreciation $ 3,600    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Remaining lease term 1 year    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Remaining lease term 15 years    
Lease renewal term 10 years