Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lessee, Lease, Description [Line Items]
Amount of Lease-related assets and liabilities pre-tax reduction to retained earnings	$ 300
Lease expense	$ 2,258	$ 2,100
Terminate lease	1 year
Increase in gross cash outflows when control of additional manufacturing space commences during the fourth quarter of 2019	$ 6,100
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	$ 3,500
Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	11 years
Lease renewal term	10 years