FAIR VALUE MEASUREMENTS (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Assets:
Total		$ 9,366,000
Derivative assets	804,000	842,000
Liabilities:
Derivative liabilities	93,000	829,000
Fair Value, Inputs, Level 3	0	0
Quoted Prices In Active Markets (Level 1)
Assets:
Total		0
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Total		9,366,000
Derivative assets	804,000	842,000
Liabilities:
Derivative liabilities	93,000	829,000
U.S. government obligations and agency securities
Assets:
Total		6,829,000
U.S. government obligations and agency securities | Quoted Prices In Active Markets (Level 1)
Assets:
Total		0
U.S. government obligations and agency securities | Significant Other Observable Inputs (Level 2)
Assets:
Total		6,829,000
U.S. corporate debt
Assets:
Total		664,000
U.S. corporate debt | Quoted Prices In Active Markets (Level 1)
Assets:
Total		0
U.S. corporate debt | Significant Other Observable Inputs (Level 2)
Assets:
Total		664,000
Foreign corporate debt and equity securities
Assets:
Total		1,873,000
Foreign corporate debt and equity securities | Quoted Prices In Active Markets (Level 1)
Assets:
Total		0
Foreign corporate debt and equity securities | Significant Other Observable Inputs (Level 2)
Assets:
Total		1,873,000
4.00% Convertible Senior Notes
Liabilities:
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Convertible Debt, Fair Value Disclosures	106,100,000
Term Loan [Member]
Liabilities:
Term Loan, Fair Value Disclosure	$ 66,900,000