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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income from continuing operations      
U.S. operations $ 54,702 $ 47,220 $ 40,282
Foreign operations 5,176 12,670 8,448
Profit Before Income Taxes 59,878 59,890 48,730
Current:      
Federal 13,551 8,158 10,321
Foreign 3,567 4,633 2,277
State 1,136 1,089 1,450
Current Income Tax Expense 18,254 13,880 14,048
Deferred:      
Federal 1,856 4,423 2,330
Foreign (424) (126) (203)
State (39) 129 (158)
Deferred Income Tax Expense 1,393 4,426 1,969
Total:      
Federal 15,407 12,581 12,651
Foreign 3,143 4,507 2,074
State 1,097 1,218 1,292
Total Income Tax Expense 19,647 18,306 16,017
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 1.70% 1.00% 2.00%
Effect of foreign operations (3.30%) (6.20%) 0.50%
Effect of changes in valuation allowances 3.70% 2.30% 0.00%
Domestic production activities deduction (1.60%) (1.50%) (1.60%)
Other, net (2.70%) 0.00% (3.00%)
Effective income tax rate 32.80% 30.60% 32.90%
Deferred Tax Assets:      
Inventories, principally due to additional costs inventoried for tax purposes and changes in inventory reserves 0 28 426
Employee wages and benefits, principally due to accruals for financial reporting purposes 14,831 18,608 20,910
Warranty reserves accrued for financial reporting purposes 2,803 2,641 2,625
Receivable, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals 1,593 1,540 1,464
Tax loss carryforwards 8,696 6,619 5,915
Tax credit carryforwards 4,078 6,720 8,554
Other 2,523 2,329 1,777
Gross Deferred Tax Assets 34,524 38,485 41,671
Less: valuation allowance (7,243) (4,719) (3,229)
Total Net Deferred Tax Assets 27,281 33,766 38,442
Deferred Tax Liabilities:      
Inventories, principally due to changes in inventory reserves 306 0 0
Property, Plant and Equipment, principally due to differences in depreciation and related gains 7,446 7,945 9,167
Goodwill and Intangible Assets 6,253 6,818 7,093
Total Deferred Tax Liabilities 14,005 14,763 16,260
Net Deferred Tax Assets 13,276 19,003 22,182
Reconciliation of unrecognized tax benefits      
Balance at January 1, 3,480 3,424  
Increases as a result of tax positions taken during a prior period 155 0  
Increases as a result of tax positions taken during the current year 508 611  
Reductions as a result of a lapse of the applicable statute of limitations (295) (447)  
Decreases as a result of foreign currency fluctuations (188) (108)  
Balance at December 31, 3,660 3,480 3,424
Unrecognized tax benefits that would impact the effective tax rate 3,384 3,259  
Unrecognized Tax Benefits 3,660 3,480 3,424
Accrued interest and penalties 525 462  
U.S.
      
Operating loss carryforwards      
Undistributed earnings of non-U.S. subsidiaries 23,596    
Foreign tax credit carryforwards 3,157    
Foreign tax credit carryforwards expiration Dec. 31, 2020    
Dutch
      
Operating loss carryforwards      
Tax loss carryforwards 18,046    
Tax loss carryforwards expiration 9 years    
Foreign tax credit carryforwards 922    
German
      
Operating loss carryforwards      
Tax loss carryforwards $ 15,674