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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (Loss) from continuing operations                    
U.S. operations         $ 54,018 $ 51,189 $ 52,315      
Foreign operations         12,473 (765) 17,223      
Profit Before Income Taxes $ 4,327 $ 15,873 $ (2,632) $ 44,994 66,491 50,424 69,538      
Current:                    
Federal         15,962 15,117 11,903      
Foreign         3,035 3,992 3,373      
State         1,859 1,685 1,543      
Current Income Tax Expense         20,856 20,794 16,819      
Deferred:                    
Federal         (472) (481) 2,650      
Foreign         (434) (1,888) (524)      
State         (73) (89) (58)      
Deferred Income Tax Expense         (979) (2,458) 2,068      
Total:                    
Federal         15,490 14,636 14,553      
Foreign         2,601 2,104 2,849      
State         1,786 1,596 1,485      
Total Income Tax Expense 731 $ 4,396 385 13,750 $ 19,877 $ 18,336 $ 18,887      
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% 2.20% 1.70%      
Effect of foreign operations         (5.50%) (5.10%) (4.60%)      
Impairment of Long-Lived Assets         0.00% 7.00% 0.00%      
Effect of changes in valuation allowances         1.90% 1.50% (0.90%)      
Domestic production activities deduction         (2.20%) (2.70%) (1.60%)      
Other, net         (1.00%) (1.50%) (2.40%)      
Effective income tax rate         29.90% 36.40% 27.20%      
Deferred Tax Assets:                    
Inventories, principally due to changes in inventory reserves                 $ 332 $ 0
Employee wages and benefits, principally due to accruals for financial reporting purposes                 14,723 16,395
Warranty reserves accrued for financial reporting purposes                 3,617 3,101
Receivable, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals                 1,413 1,446
Tax loss carryforwards                 7,821 5,834
Tax credit carryforwards                 1,228 1,102
Other                 2,126 603
Gross Deferred Tax Assets                 31,260 28,481
Less: valuation allowance                 (6,865) (5,884)
Total Net Deferred Tax Assets                 24,395 22,597
Deferred Tax Liabilities:                    
Inventories, principally due to changes in inventory reserves                 0 617
Property, Plant and Equipment, principally due to differences in depreciation and related gains                 6,947 6,619
Goodwill and Intangible Assets                 4,180 3,315
Total Deferred Tax Liabilities                 11,127 10,551
Net Deferred Tax Assets                 13,268 12,046
Reconciliation of unrecognized tax benefits                    
Balance at January 1,     2,477 2,326 $ 2,326 $ 3,029        
Increases as a result of tax positions taken during the current year         545 532        
Decreases relating to settlement with tax authorities         (6) (72)        
Reductions as a result of a lapse of the applicable statute of limitations     (688)   (523) (760)        
Increases (Decreases) as a result of foreign currency fluctuations         135 (403)        
Balance at December 31, 2,475   2,475   2,477 2,326 $ 3,029      
Unrecognized tax benefits that would impact the effective tax rate               $ 2,130 2,114 1,992
Unrecognized Tax Benefits $ 2,475   $ 2,477 $ 2,326 $ 2,326 $ 3,029 $ 3,029 2,475 2,477 2,326
Accrued interest and penalties               $ 426 490 $ 504
Maximum                    
Income Tax General Disclosure [Abstract]                    
Income Tax Examination, Year under Examination     2016   2014          
Minimum                    
Income Tax General Disclosure [Abstract]                    
Income Tax Examination, Year under Examination     2014   2007          
U.S.                    
Income Tax General Disclosure [Abstract]                    
Undistributed earnings of non-U.S. subsidiaries                 14,650  
Dutch                    
Operating loss carryforwards                    
Tax loss carryforwards                 17,276  
Tax loss carryforwards expiration         9 years          
Foreign tax credit carryforwards                 1,228  
German                    
Operating loss carryforwards                    
Tax loss carryforwards                 $ 10,764