Rental Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 172,552		$ 169,372
Depreciation - Property, plant and equipment	5,236	$ 5,247
Rental Equipment
Property, Plant and Equipment [Line Items]
Accumulated depreciation	19,800		$ 20,100
Depreciation - Property, plant and equipment	$ 1,900	$ 2,200