BORROWING ARRANGEMENTS (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 29, 2014	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2013	Dec. 31, 2014	Dec. 06, 2013
Line of Credit Facility [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding		$ 55,000	$ 55,000		$ 75,000
Interest Expense, Debt		400	1,100
Short-term Debt		9,372	9,372		$ 7,260
Long-term Debt
Line of Credit Facility [Line Items]
Interest rate charged for borrowing	1.25%
Advances from Foreign Government
Line of Credit Facility [Line Items]
Short-term Debt		7,800	7,800
Loan Owed to Privately-Held Company
Line of Credit Facility [Line Items]
Short-term Debt		$ 1,600	$ 1,600
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 300,000
Line of Credit Facility Covenant Additional Financing Allowable				$ 250,000
Issuance cost for credit facility				$ 2,100