INVESTMENTS (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Held to Maturity and Available-for-sale
Held to maturity and available-for-sale securities, Amortized Cost	$ 402,888	$ 248,376
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains	12
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses	103	2,433
Held to maturity and available-for-sale securities, Fair Value	402,797	245,943
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months	103	25
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position greater than 12 Months		2,408
Held to Maturity, Available-for-sale, and Trading
Total Fair Value	438,853	288,813
Short-term \| U.S. Treasuries
Held to Maturity
Amortized Cost	46,140	66,521
Gross Unrealized Holding Gains	12
Gross Unrealized Holding Losses		2
Fair Value	46,152	66,519
Continuous Unrealized Loss Position less than 12 Months		2
Short-term \| Certificates of deposit
Held to Maturity
Amortized Cost	33,847	7,004
Fair Value	33,847	7,004
Short-term \| Corporate bonds
Held to Maturity
Amortized Cost	2,021
Fair Value	2,021
Short-term \| Municipal securities
Held to Maturity
Amortized Cost	204,736	71,266
Gross Unrealized Holding Losses	102	15
Fair Value	204,634	71,251
Continuous Unrealized Loss Position less than 12 Months	102	15
Short-term \| U.S. government agency securities.
Held to Maturity
Amortized Cost	46,013	19,688
Gross Unrealized Holding Losses	1	8
Fair Value	46,012	19,680
Continuous Unrealized Loss Position less than 12 Months	1	8
Short-term \| Variable rate demand notes
Available-for-sale
Amortized Cost	66,811	56,107
Fair Value	66,811	56,107
Short-term \| Auction rate securities
Trading
Fair Value	12,687	24,063
Long-term \| Auction rate securities
Available-for-sale
Amortized Cost	3,320	27,790
Gross Unrealized Holding Losses		2,408
Fair Value	3,320	25,382
Continuous Unrealized Loss Position greater than 12 Months		2,408
Trading
Fair Value	$ 23,369	$ 18,807

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Represents the cost of debt and equity securities, which are categorized as held-to-maturity and available-for-sale, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.