DEBT (Details)			3 Months Ended			3 Months Ended						3 Months Ended			3 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Credit Agreement term loan facility U.S. dollar denominated [Member] USD ($)		Dec. 31, 2014 Credit Agreement term loan facility U.S. dollar denominated [Member] USD ($)	Mar. 31, 2015 Credit Agreement term loan facility Japanese Yen denominated [Member] USD ($)		Mar. 31, 2015 Credit Agreement term loan facility Japanese Yen denominated [Member] JPY (¥)		Dec. 31, 2014 Credit Agreement term loan facility Japanese Yen denominated [Member] USD ($)	Dec. 31, 2014 Credit Agreement term loan facility Japanese Yen denominated [Member] JPY (¥)	Mar. 31, 2015 Credit Agreement revolving credit facility [Member] USD ($)		Dec. 31, 2014 Credit Agreement revolving credit facility [Member] USD ($)	Mar. 31, 2015 Korea Subsidiary Loan [Member] USD ($)		Dec. 31, 2014 Korea Subsidiary Loan [Member] USD ($)	Mar. 31, 2015 Multi-currency uncommitted shelf facility, total U.S. dollar-denominated debt [Member] USD ($)	Mar. 31, 2015 Multi-currency uncommitted shelf facility, total Japanese yen-denominated debt [Member] USD ($)
Debt Instrument [Line Items]
Original principal amount - facilities			$ 127,500,000					¥ 6,600,000,000				$ 0			$ 20,000,000
Balance - facilities			124,300,000	[1],[2]	125,900,000	53,500,000	[1],[2]	6,400,000,000	[1],[2]	54,400,000	6,500,000,000	72,500,000	[1],[2]	72,500,000	20,000,000	[1],[2]	0
Interest rate - facilities (in hundredths)															1.12%
Repayment terms			One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.			One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.		One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.				Revolving line of credit expires October 2019			One half of the principal amount payable on March 17, 2017 and the remainder payable on March 16, 2018.
Balance - other borrowings																			3,400,000
Interest rate description - other borrowings			Variable 30 day: 2.926%			Variable 30 day: 2.8207%		Variable 30 day: 2.8207%				Variable 30 day: 2.926%
Interest rate - other borrowings (in hundredths)			2.926%			2.8207%		2.8207%				2.926%
Current portion of long-term debt	83,899,000	82,770,000																80,500,000
Debt discount	$ 5,200,000

[1] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $5.2 million, which is not reflected in this table.

[2] As of March 31, 2015, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $80.5 million of the balance of its U.S. dollar denominated debt under the Credit Agreement facility and $3.4 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility. The Company has classified the amount borrowed under the revolving line of credit as short term because it is the Company's intention to use this line of credit to borrow and pay back funds over short periods of time.