REVENUE, Disclosure of Impact of Adoption on Balance Sheet and Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets [Abstract]
Unbilled receivables	$ 13,643		$ 0
Inventories	102,693		107,719
Liabilities [Abstract]
Other current liabilities	7,664		6,204
Equity [Abstract]
Retained earnings	149,171		147,807
Statement of Operations [Abstract]
Net sales	118,251	$ 113,668
Cost of sales	97,118	90,305
Operating income	437	2,355
Provision for income taxes	325	(23)
Net earnings	(1,303)	$ 746
ASU 2014-09 [Member]
Assets [Abstract]
Unbilled receivables			14,536
Inventories			96,675
Liabilities [Abstract]
Other current liabilities			6,247
Equity [Abstract]
Retained earnings			151,256
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Assets [Abstract]
Unbilled receivables	0
Inventories	112,650
Liabilities [Abstract]
Other current liabilities	7,553
Equity [Abstract]
Retained earnings	145,596
Statement of Operations [Abstract]
Net sales	119,092
Cost of sales	98,205
Operating income	191
Provision for income taxes	260
Net earnings	(1,484)
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member]
Assets [Abstract]
Unbilled receivables	13,643		14,536
Inventories	(9,957)		(11,044)
Liabilities [Abstract]
Other current liabilities	111		43
Equity [Abstract]
Retained earnings	3,575		$ 3,449
Statement of Operations [Abstract]
Net sales	(841)
Cost of sales	(1,087)
Operating income	246
Provision for income taxes	65
Net earnings	$ 181