Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Cash equivalents	$ 88,900	$ 76,200
Provision for doubtful accounts	$ 489	$ 0	$ 2,160
Leases [Abstract]
Lease, Practical Expedients, Package [true false]	true
Lessee Operating Lease Option To Extend	Lease terms include options to extend or terminate the lease when it is reasonably certain that those options will be exercised.
Lessee, Operating Lease, Option to Terminate	Lease terms include options to extend or terminate the lease when it is reasonably certain that those options will be exercised.
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Lessee, Operating Lease, Existence of Option to Terminate [true false]	true
Anti-dilutive securities to purchase common shares	0.0	0.1	0.1
Compensation cost recognized for stock-based awards	$ 18,500	$ 15,300	$ 10,400
Future tax benefit of stock-based awards as of grant date	4,400	3,600	2,400
Total cash received as a result of stock option exercises	700	300	1,000
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards	2,500	2,700	2,100
Total intrinsic value of stock options exercised	500	500	500
Exchange gain (loss) related to foreign currency transactions	600	(300)	$ (1,800)
Government incentives	900	500
Prepaid and other assets	$ 0	$ 500
Minimum [Member] | Buildings And Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	5 years
Minimum [Member] | Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	2 years
Minimum [Member] | Furniture And Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	2 years
Minimum [Member] | Vehicles [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	2 years
Maximum [Member] | Buildings And Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	40 years
Maximum [Member] | Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	15 years
Maximum [Member] | Furniture And Fixtures [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	12 years
Maximum [Member] | Vehicles [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of the assets	8 years