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INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Held to Maturity and Available-for-sale    
Held to maturity and available-for-sale securities, Amortized Cost $ 611,618 $ 395,855
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains 127 48
Held to maturity and available-for-sale securities, Fair Value 611,745 395,903
Held to Maturity, Available-for-sale, and Trading    
Total Fair Value 616,587 412,087
Short-term | Certificates of deposit
   
Held-to-Maturity    
Amortized Cost 2,504 22,045
Fair Value 2,504 22,045
Short-term | Commercial paper
   
Held-to-Maturity    
Amortized Cost 1,000 5,991
Fair Value 1,000 5,991
Short-term | Municipal securities
   
Held-to-Maturity    
Amortized Cost 579,695 367,819
Gross Unrealized Holding Gains 123 48
Fair Value 579,818 367,867
Short-term | Auction rate securities
   
Trading    
Fair Value 4,842 6,392
Long-term | Municipal securities
   
Held-to-Maturity    
Amortized Cost 28,419  
Gross Unrealized Holding Gains 4  
Fair Value 28,423  
Long-term | Auction rate securities
   
Trading    
Fair Value   $ 9,792