Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounting Policies [Line Items]
Number of principal reporting segments | segment	3
Period of delayed payment terms	11 months
Accumulated depreciation relating to rental equipment	$ 113,412	$ 107,094
Options
Accounting Policies [Line Items]
Award vesting period (years)	5 years
Minimum
Accounting Policies [Line Items]
Estimated useful lives	12 years
Maximum
Accounting Policies [Line Items]
Estimated useful lives	25 years
Option term (years)	10 years
Rental Equipment
Accounting Policies [Line Items]
Accumulated depreciation relating to rental equipment	$ 10,430	8,322
Selling, General and Administrative expenses
Accounting Policies [Line Items]
Advertising expense	7,742	7,670	$ 7,368
Product development and engineering costs	8,847	$ 8,590	$ 8,427
Pension Plans, Defined Benefit
Accounting Policies [Line Items]
Amount expenses of accumulated pension actuarial losses	2,889
Pension Plans, Defined Benefit | Hourly Employees’ Pension Plan
Accounting Policies [Line Items]
Amount of final contribution	622
Amount expenses of accumulated pension actuarial losses	2,889
Foreign Currency Forward
Accounting Policies [Line Items]
Outstanding forward exchange contracts related to sales	$ 1,384