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Revenues - Disaggregation of Revenue by Geographic Location (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]      
Revenue $ 299,794 $ 254,350 $ 224,929
United States      
Disaggregation of Revenue [Line Items]      
Revenue 124,905 105,663 95,919
United Kingdom      
Disaggregation of Revenue [Line Items]      
Revenue 29,749 26,487 26,845
Other Europe      
Disaggregation of Revenue [Line Items]      
Revenue 60,850 52,427 46,401
Israel      
Disaggregation of Revenue [Line Items]      
Revenue 11,545 7,308 5,497
Asia      
Disaggregation of Revenue [Line Items]      
Revenue 51,443 45,084 34,883
Canada      
Disaggregation of Revenue [Line Items]      
Revenue 21,302 17,381 15,384
Foil Technology Products      
Disaggregation of Revenue [Line Items]      
Revenue 141,009 116,273 100,942
Foil Technology Products | United States      
Disaggregation of Revenue [Line Items]      
Revenue 61,132 52,032 47,414
Foil Technology Products | United Kingdom      
Disaggregation of Revenue [Line Items]      
Revenue 3,666 3,173 3,770
Foil Technology Products | Other Europe      
Disaggregation of Revenue [Line Items]      
Revenue 31,431 26,322 22,969
Foil Technology Products | Israel      
Disaggregation of Revenue [Line Items]      
Revenue 11,028 6,673 4,719
Foil Technology Products | Asia      
Disaggregation of Revenue [Line Items]      
Revenue 33,752 28,073 22,070
Foil Technology Products | Canada      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Force Sensors      
Disaggregation of Revenue [Line Items]      
Revenue 73,186 65,446 60,234
Force Sensors | United States      
Disaggregation of Revenue [Line Items]      
Revenue 39,955 34,108 30,082
Force Sensors | United Kingdom      
Disaggregation of Revenue [Line Items]      
Revenue 11,787 12,187 12,232
Force Sensors | Other Europe      
Disaggregation of Revenue [Line Items]      
Revenue 10,678 8,793 8,087
Force Sensors | Israel      
Disaggregation of Revenue [Line Items]      
Revenue 517 635 751
Force Sensors | Asia      
Disaggregation of Revenue [Line Items]      
Revenue 10,249 9,723 9,082
Force Sensors | Canada      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Weighing and Control Systems      
Disaggregation of Revenue [Line Items]      
Revenue 85,599 72,631 63,753
Weighing and Control Systems | United States      
Disaggregation of Revenue [Line Items]      
Revenue 23,818 19,523 18,423
Weighing and Control Systems | United Kingdom      
Disaggregation of Revenue [Line Items]      
Revenue 14,296 11,127 10,843
Weighing and Control Systems | Other Europe      
Disaggregation of Revenue [Line Items]      
Revenue 18,741 17,312 15,345
Weighing and Control Systems | Israel      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 27
Weighing and Control Systems | Asia      
Disaggregation of Revenue [Line Items]      
Revenue 7,442 7,288 3,731
Weighing and Control Systems | Canada      
Disaggregation of Revenue [Line Items]      
Revenue $ 21,302 $ 17,381 $ 15,384