Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income from continuing operations
U.S. operations	$ 47,220	$ 40,282	$ 26,297
Foreign operations	12,670	8,448	8,430
Profit Before Income Taxes	59,890	48,730	34,727
Current:
Federal	8,158	10,321	6,756
Foreign	4,633	2,277	3,005
State	1,089	1,450	1,214
Current Income Tax Expense	13,880	14,048	10,975
Deferred:
Federal	4,423	2,330	(10,541)
Foreign	(126)	(203)	(248)
State	129	(158)	(262)
Deferred Income Tax Expense (Benefit)	4,426	1,969	(11,051)
Total:
Federal	12,581	12,651	(3,785)
Foreign	4,507	2,074	2,757
State	1,218	1,292	952
Total Income Tax Expense (Benefit)	18,306	16,017	(76)
Undistributed earnings of non-U.S. subsidiaries	21,277
Operating loss carryforwards
Foreign tax credit carryforwards	6,034
Foreign tax credit carryforwards expiration	Jan. 01, 2020
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	1.00%	2.00%	0.70%
Effect of foreign operations	(6.20%)	0.50%	0.50%
International restructuring	0.00%	0.00%	(31.40%)
Effect of changes in valuation allowances	2.30%	0.00%	0.10%
Domestic production activities deduction	(1.50%)	(1.60%)	(3.00%)
Other, net	0.00%	(3.00%)	(2.10%)
Effective income tax rate	30.60%	32.90%	(0.20%)
Deferred tax assets:
Inventories, principally due to additional costs inventoried for tax purposes and changes in inventory reserves	28	426	1,081
Employee wages and benefits, principally due to accruals for financial reporting purposes	18,608	20,910	17,948
Warranty reserves accrued for financial reporting purposes	2,641	2,625	2,175
Accounts receivable, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals	1,540	1,464	1,252
Tax loss carryforwards	6,619	5,915	12,725
Valuation allowance	(4,719)	(3,229)	(9,170)
Tax credit carryforwards	6,720	8,554	10,119
Other	2,329	1,777	1,937
Total deferred tax assets	33,766	38,442	38,067
Deferred tax liabilities:
Property, Plant and Equipment, principally due to differences in depreciation and related gains	7,945	9,167	8,562
Goodwill and Intangible Assets	6,818	7,093	8,390
Total deferred tax liabilities	14,763	16,260	16,952
Net deferred tax assets	19,003	22,182	21,115
Reconciliation of unrecognized tax benefits
Balance at January 1,	3,424	5,272
Decreases as a result of tax positions taken during a prior period	0	(765)
Increases as a result of tax position taken during the current year	611	828
Decreases relating to settlements with taxing authorities	0	(193)
Reductions as a result of a lapse of the applicable statute of limitations	(447)	(1,551)
Decreases as a result of foreign currency fluctuations	(108)	(167)
Balance at December 31,	3,480	3,424	5,272
Unrecognized tax benefits that would impact the effective tax rate	3,259	3,209
Accrued interest and penalties	462	427
Dutch
Operating loss carryforwards
Tax loss carryforwards	10,136
Tax loss carryforwards expiration	9 years
Foreign tax credit carryforwards	687
German
Operating loss carryforwards
Tax loss carryforwards	$ 15,292