Leases (Components of Lease Costs) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Line Items]
Net lease cost	$ 14,658
Selling, General And Administrative Expenses [Member]
Leases [Line Items]
Operating lease cost	5,318	[1]
Short-term lease costs	900
Variable lease costs	400
Cost Of Sales [Member]
Leases [Line Items]
Operating lease cost	9,090	[2]
Amortization of right-of-use assets	233
Short-term lease costs	2,600
Variable lease costs	1,100
Interest Expense [Member]
Leases [Line Items]
Interest of lease liabilities	$ 17

[1] Included in operating lease cost is $0.9 million of short-term lease costs and $0.4 million of variable lease costs for the year ended December 31, 2019.

[2] Included in operating lease cost is $2.6 million of short-term lease costs and $1.1 million of variable lease costs for the year ended December 31, 2019.