REVENUE, Impact of Adoption on Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets [Abstract]
Unbilled receivables	$ 15,799	$ 0
Inventories	120,068	107,719
Liabilities [Abstract]
Other current liabilities	15,061	6,204
Equity [Abstract]
Retained earnings	168,695	147,807
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	131,885
Liabilities [Abstract]
Other current liabilities	15,041
Equity [Abstract]
Retained earnings	164,734
Effect of Change Higher/(Lower) [Member] \| ASU 2014-09 [Member]
Assets [Abstract]
Unbilled receivables	15,799	14,536
Inventories	(11,817)	(11,044)
Liabilities [Abstract]
Other current liabilities	20	43
Equity [Abstract]
Retained earnings	$ 3,961	$ 3,449

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