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RECENT ACCOUNTING PRONOUNCEMENTS (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Income    
Net Sales $ 159,160 $ 148,933
Costs and Expenses    
Costs of Operations 140,733 133,538
Income Tax Provision 2,663 2,148
Net Income 6,670 $ 3,839
Balances Without Adoption of ASU 2014-09    
Statement of Income    
Net Sales 160,035  
Costs and Expenses    
Costs of Operations 141,433  
Income Tax Provision 2,724  
Net Income 6,784  
Effect of Adoption Increase/(Decrease)    
Statement of Income    
Net Sales (875)  
Costs and Expenses    
Costs of Operations (700)  
Income Tax Provision (61)  
Net Income $ (114)