RECENT ACCOUNTING PRONOUNCEMENTS (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Income
Net Sales	$ 176,888	$ 153,089	$ 336,048	$ 302,022
Costs and Expenses
Costs of Operations	155,609	135,486	296,342	269,024
Income Tax Provision	2,890	3,267	5,553	5,415
Net Income	7,600	$ 5,425	14,270	$ 9,264
ASU 2014-09 | Balances Without Adoption of ASU 2014-09
Statement of Income
Net Sales	176,855		336,890
Costs and Expenses
Costs of Operations	155,583		297,016
Income Tax Provision	2,864		5,588
Net Income	7,619		14,403
ASU 2014-09 | Effect of Adoption Increase/(Decrease)
Statement of Income
Net Sales	33		(842)
Costs and Expenses
Costs of Operations	26		(674)
Income Tax Provision	26		(35)
Net Income	$ (19)		$ (133)