Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Income (Loss) from continuing operations
U.S. operations	$ 51,189	$ 52,315	$ 54,702
Foreign operations	(765)	17,223	5,176
Profit Before Income Taxes	50,424	69,538	59,878
Current:
Federal	15,117	11,903	13,551
Foreign	3,992	3,373	3,567
State	1,685	1,543	1,136
Current Income Tax Expense	20,794	16,819	18,254
Deferred:
Federal	(481)	2,650	1,856
Foreign	(1,888)	(524)	(424)
State	(89)	(58)	(39)
Deferred Income Tax Expense	(2,458)	2,068	1,393
Total:
Federal	14,636	14,553	15,407
Foreign	2,104	2,849	3,143
State	1,596	1,485	1,097
Total Income Tax Expense	$ 18,336	$ 18,887	$ 19,647
Effective income tax rate reconciliation
Tax at statutory rate	35.00%	35.00%	35.00%
Increases (decreases) in the tax rate from:
State and local taxes, net of federal benefit	2.20%	1.70%	1.70%
Effect of foreign operations	(5.10%)	(4.60%)	(3.30%)
Impairment of Long-Lived Assets	7.00%	0.00%	0.00%
Effect of changes in valuation allowances	1.50%	(0.90%)	3.70%
Domestic production activities deduction	(2.70%)	(1.60%)	(1.60%)
Other, net	(1.50%)	(2.40%)	(2.70%)
Effective income tax rate	36.40%	27.20%	32.80%
Deferred Tax Assets:
Employee wages and benefits, principally due to accruals for financial reporting purposes				$ 16,395	$ 16,696
Warranty reserves accrued for financial reporting purposes				3,101	2,895
Receivable, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals				1,446	1,549
Tax loss carryforwards				5,834	6,845
Tax credit carryforwards				1,102	1,043
Other				603	1,246
Gross Deferred Tax Assets				28,481	30,274
Less: valuation allowance				(5,884)	(5,699)
Total Net Deferred Tax Assets				22,597	24,575
Deferred Tax Liabilities:
Inventories, principally due to changes in inventory reserves				617	305
Property, Plant and Equipment, principally due to differences in depreciation and related gains				6,619	6,745
Goodwill and Intangible Assets				3,315	5,611
Total Deferred Tax Liabilities				10,551	12,661
Net Deferred Tax Assets				12,046	11,914
Reconciliation of unrecognized tax benefits
Balance at January 1,	$ 3,029	$ 3,660
Increases as a result of tax positions taken during the current year	532	610
Decreases relating to settlement with tax authorities	(72)	(6)
Reductions as a result of a lapse of the applicable statute of limitations	(760)	(1,033)
Decreases as a result of foreign currency fluctuations	(403)	(202)
Balance at December 31,	2,326	3,029	$ 3,660
Unrecognized tax benefits that would impact the effective tax rate				1,992	2,684
Unrecognized Tax Benefits	$ 3,029	$ 3,660	$ 3,660	2,326	3,029
Accrued interest and penalties				504	$ 557
Maximum
Income Tax General Disclosure [Abstract]
Income Tax Examination, Year under Examination	2014
Minimum
Income Tax General Disclosure [Abstract]
Income Tax Examination, Year under Examination	2007
U.S.
Income Tax General Disclosure [Abstract]
Undistributed earnings of non-U.S. subsidiaries				30,786
Dutch
Operating loss carryforwards
Tax loss carryforwards				9,889
Tax loss carryforwards expiration	9 years
Foreign tax credit carryforwards				1,102
German
Operating loss carryforwards
Tax loss carryforwards				$ 11,834