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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Auction rate securities
   
Fair value of level 3 financial assets, roll forward    
Balance at the beginning of the period $ 35,852 $ 68,252
Total gains (losses) for the period: Included in earnings 1,897 (44)
Total gains (losses) for the period: Included in other comprehensive income 2,482 2,409
Settlements (17,075) (34,765)
Balance at the end of the period 23,156 35,852
Put Options
   
Fair value of level 3 financial assets, roll forward    
Balance at the beginning of the period 3,041 3,768
Total gains (losses) for the period: Included in earnings (1,112) (727)
Balance at the end of the period $ 1,929 $ 3,041