SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNITNG PRONOUNCEMENTS Prior Period Cash Flows Adjustments, Adoption of ASU 2014-09 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Consolidated Cash Flows Data
Net income	$ 13,902	$ 11,407	$ 28,001	$ 21,786
Deferred income taxes			(648)	225
Accounts receivable			(12,249)	(6,252)
Prepaid expenses and other assets			$ (8,349)	(674)
Deferred income on sales to distributors				0
As Reported
Condensed Consolidated Cash Flows Data
Net income		11,265		20,108
Deferred income taxes				214
Accounts receivable				(6,385)
Prepaid expenses and other assets				(639)
Deferred income on sales to distributors				1,787
Adjustments for Accounting Standards Update 2014-09
Condensed Consolidated Cash Flows Data
Net income		$ 142		1,678
Deferred income taxes				11
Accounts receivable				133
Prepaid expenses and other assets				(35)
Deferred income on sales to distributors				$ (1,787)