FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Apr. 25, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Assets:
Total			$ 9,366
Derivative assets		1,321	842
Liabilities:
Derivative liabilities		250	829
Fair Value, Inputs, Level 3		0		0
Debt Instrument, 4.00% Interest Rate, Stated Percentage		4.00%
4.00% Convertible Debt, Fair Value Disclosures	93,300	109,200
Term Loan, Fair Value Disclosure		70,088
Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total			0
Derivative assets		0	0
Liabilities:
Derivative liabilities		0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total			9,366
Derivative assets		1,321	842
Liabilities:
Derivative liabilities		250	829
U.S. government obligations and agency securities [Member]
Assets:
Total			6,829
U.S. government obligations and agency securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total			0
U.S. government obligations and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total			6,829
U.S. corporate debt [Member]
Assets:
Total			664
U.S. corporate debt [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total			0
U.S. corporate debt [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total			664
Foreign corporate debt and equity securities [Member]
Assets:
Total			1,873
Foreign corporate debt and equity securities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Assets:
Total			0
Foreign corporate debt and equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total			$ 1,873