SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNITNG PRONOUNCEMENTS Prior Period Cash Flows Adjustments, Adoption of ASU 2014-09 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidated Cash Flows Data
Net income	$ 16,506	$ 12,809	$ 44,507	$ 34,595
Deferred income taxes			(485)	506
Accounts receivable			(10,873)	(5,596)
Prepaid expenses and other assets			$ (21,048)	(2,076)
Deferred income on sales to distributors				0
As Reported
Condensed Consolidated Cash Flows Data
Net income		14,165		34,273
Deferred income taxes				490
Accounts receivable				(7,164)
Prepaid expenses and other assets				(1,403)
Deferred income on sales to distributors				1,233
Adjustments for Accounting Standards Update 2014-09
Condensed Consolidated Cash Flows Data
Net income		$ (1,356)		322
Deferred income taxes				16
Accounts receivable				1,568
Prepaid expenses and other assets				(673)
Deferred income on sales to distributors				$ (1,233)