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REVENUE, Cumulative Effect of Changes made to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Balance Sheet [Abstract]
Unbilled receivables	$ 15,587	$ 0
Inventory	106,448	107,719
Other current liabilities	5,077	6,204
Retained earnings	154,985	147,807
ASU 2014-09 [Member]
Balance Sheet [Abstract]
Unbilled receivables		14,536
Inventory		96,675
Other current liabilities		6,247
Retained earnings		151,256
Adjustments Due to ASC 606 [Member] | ASU 2014-09 [Member]
Balance Sheet [Abstract]
Unbilled receivables	15,587	14,536
Inventory	(11,332)	(11,044)
Other current liabilities	159	43
Retained earnings	4,096	$ 3,449
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Balance Sheet [Abstract]
Unbilled receivables	0
Inventory	117,780
Other current liabilities	4,918
Retained earnings	$ 150,889

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