Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Inventory basis difference	$ 571	$ 1,568
Accounts receivable reserve	310	231
Rental equipment and Property, plant and equipment	4	0
Stock based compensation	549	937
Pension liability	2,859	3,947
Employee benefit accrual	2,193	1,481
Product liability and warranty reserves	1,211	1,600
Expenses not currently deductible for tax purposes	0	28
Foreign net operating loss	4,266	3,513
State net operating loss	286	102
Foreign tax credit	4,106	0
Other	216	94
Total deferred income tax assets	16,571	13,501
Less: Valuation allowance	(8,519)	(3,382)
Net deferred income tax assets	8,052	10,119
Deferred income tax liabilities:
Inventory basis differences	0	(16)
Rental equipment and Property, plant and equipment	(7,477)	(5,289)
Intangible assets	(7,064)	(10,046)
Expenses not currently deductible for tax purposes	(887)	(593)
Total deferred income tax liabilities	(15,428)	(15,944)
Net deferred income taxes	$ (7,376)	$ (5,825)