Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Raw materials		$ 42,066
Work in process		5,496
Finished goods and parts		63,544
Inventories	$ 113,240	$ 111,106
March 31, 2020
Inventory [Line Items]
Raw materials	35,736
Work in process	12,502
Finished goods and parts	65,002
Inventories	$ 113,240