FINANCIAL INSTRUMENTS, Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 25, 2012
FINANCIAL INSTRUMENTS [Abstract]
Debt Instrument, 3.50% Interest Rate, Stated Percentage	3.50%
3.50% Senior Convertible Notes Aggregate Principal Amount	$ 3,855
Aggregate Principal Amount of 3.50% Senior Convertible Notes Repurchased	91,614
Repurchase of 3.50% Senior Convertible Notes	92,059
Debt Instrument, Convertible, Interest Expense	445
Convertible Senior Notes, Face Amount		105,000
4.00% Convertible Senior Notes Aggregate Principal Amount	105,000	105,000
Fair Value of Senior Notes	105,000
Term Loan, Face Amount		85,000
Outstanding Principal Balance of Term Loan as of Balance Sheet Date	85,000
Notes Payable, Fair Value Disclosure	$ 85,000