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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income from continuing operations [Abstract]      
U.S. operations $ 40,282 $ 26,297 $ 12,103
Foreign operations 8,448 8,430 (36,423)
Profit (Loss) Before Income Taxes 48,730 34,727 (24,320)
Current [Abstract]      
Federal 10,321 6,756 (337)
Foreign 2,277 3,005 1,284
State 1,450 1,214 236
Current Income Tax Expense (Benefit) 14,048 10,975 1,183
Deferred [Abstract]      
Federal 2,330 (10,541) 1,897
Foreign (203) (248) (1,444)
State (158) (262) 285
Deferred Income Tax Expense (Benefit) 1,969 (11,051) 738
Total [Abstract]      
Federal 12,651 (3,785) 1,560
Foreign 2,074 2,757 (160)
State 1,292 952 521
Income Tax Expense (Benefit) 16,017 (76) 1,921
Undistributed earnings of non-U.S. subsidiaries 22,282    
Operating Loss Carryforwards [Line Items]      
Foreign tax credit carry-forward 8,554    
Effective tax rate reconciliation [Abstract]      
Tax at statutory rate (in hundredths) 35.00% 35.00% (35.00%)
State and local taxes, net of federal benefit (in hundredths) 2.00% 0.70% 1.10%
Effect of foreign operations (in hundredths) 0.50% 0.50% (7.00%)
International restructuring (in hundredths) 0.00% (31.40%) (9.40%)
Goodwill impairment - non-deductible (in hundredths) 0.00% 0.00% 56.90%
Effect of changes in valuation allowances (in hundredths) 0.00% 0.10% (0.70%)
Domestic production activities deduction (in hundredths) (1.60%) (3.00%) 0.80%
Other, net (in hundredths) (3.00%) (2.10%) 1.20%
Effective income tax rate (in hundredths) 32.90% (0.20%) 7.90%
Deferred tax assets [Abstract]      
Inventories, principally due to additional costs inventoried for tax purposes and changes in inventory reserves 426 1,081 867
Employee wages and benefits, principally due to accruals for financial reporting purposes 20,910 17,948 16,050
Warranty reserves accrued for financial reporting purposes 2,625 2,175 1,803
Accounts receivable, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals 1,464 1,252 1,396
Tax loss carryforwards 5,915 12,725 12,987
Valuation allowance 3,229 (9,170) (9,131)
Tax credit carryforwards 8,554 10,119 2,385
Other 1,777 1,937 1,177
Total deferred tax assets 38,442 38,067 27,534
Deferred tax liabilities [Abstract]      
Property, Plant and Equipment, principally due to differences in depreciation and related gains 9,167 8,562 8,592
Goodwill and Intangible Assets 7,093 8,390 9,086
Total deferred tax liabilities 16,260 16,952 17,678
Net deferred tax assets 22,182 21,115 9,856
Income Tax benefits relating to stock plans 1,266 1,724 114
Income Tax benefits relating to ESOP and stock plans     120
Reconciliation of unrecognized tax benefits [Roll Forward]      
Balance, Beginning of period 5,272    
Decreases as a result of tax positions taken during prior period (765)    
Increases as a result of tax positions taken during the current year 828    
Decreases for tax positions related to acquired entities during a prior period 0    
Decreases relating to settlements with taxing authorities (193)    
Reductions as a result of a lapse of the applicable statute of limitations (1,551)    
Decreases as a result of foreign currency fluctuations (167)    
Balance, End of period 3,424 5,272  
Unrecognized tax benefits that would impact effective tax rate 3,209    
Accrued interest and penalties 427    
Dutch [Member]
      
Operating Loss Carryforwards [Line Items]      
Operating loss tax carry-forwards 6,460    
Germany [Member]
      
Operating Loss Carryforwards [Line Items]      
Operating loss tax carry-forwards $ 15,271