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Acquisition of Orlaco (Narrative) (Details)
€ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2017
EUR (€)
Jan. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jan. 31, 2018
USD ($)
Business Acquisition [Line Items]              
Acquisition related costs     $ 0   $ 0    
Orlaco [Member]              
Business Acquisition [Line Items]              
Acquisition agreement date         Jan. 31, 2017    
Total cash paid at closing € 74,939 $ 79,675,000          
Acquisition related costs       $ 41,000   $ 1,259,000  
Post-acquisition sales       17,313,000   28,454,000  
Post-acquisition net income (loss)       (547,000)   45,000  
Expense related to fair value adjustment for earn-out consideration     $ 0 2,103,000 $ 369,000 2,103,000  
Orlaco [Member] | Earnout Consideration [Member]              
Business Acquisition [Line Items]              
Maximum additional earnout consideration € 7,500           $ 8,762,000
Orlaco [Member] | Fair Value Adjustment to Inventory [Member]              
Business Acquisition [Line Items]              
Expense related to inventory fair value step up       $ 657,000   $ 1,636,000