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INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Held to Maturity and Available-for-sale
Held to maturity and available-for-sale securities, Amortized Cost	$ 1,577,578	$ 820,164
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains	363	115
Held to maturity and available-for-sale securities, Gross Unrealized Holding Losses	21	3
Held to maturity and available-for-sale securities, Fair Value	1,577,920	820,276
Held to maturity and available-for-sale securities, Continuous Unrealized Loss Position less than 12 Months	21
Held to Maturity, Available-for-sale, and Trading
Investments, Fair Value Disclosure	1,579,407	824,186
U.S. government agency securities
Held to Maturity, Available-for-sale, and Trading
Investments, Fair Value Disclosure	5,019
Variable rate demand notes
Available-for-sale
Amortized Cost		4,001
Fair Value		4,001
Short-term | Commercial paper
Held-to-Maturity
Amortized Cost	306,858	19,482
Gross Unrealized Holding Losses		2
Fair Value	306,858	19,480
Short-term | U.S. Treasuries
Held-to-Maturity
Amortized Cost	92,994
Gross Unrealized Holding Gains	5
Fair Value	92,999
Short-term | Certificates of deposit
Held-to-Maturity
Amortized Cost	44,506
Fair Value	44,506
Short-term | Municipal securities
Held-to-Maturity
Amortized Cost	611,370	744,542
Gross Unrealized Holding Gains	319	105
Gross Unrealized Holding Losses	10
Fair Value	611,679	744,647
Continuous Unrealized Loss Position less than 12 Months	10
Short-term | U.S. government agency securities
Held-to-Maturity
Amortized Cost	487,495	9,199
Gross Unrealized Holding Gains	23
Gross Unrealized Holding Losses	4	1
Fair Value	487,514	9,198
Continuous Unrealized Loss Position less than 12 Months	4
Short-term | Auction rate securities
Trading
Fair Value	1,487	3,910
Long-term | Municipal securities
Held-to-Maturity
Amortized Cost	29,333	42,940
Gross Unrealized Holding Gains	16	10
Gross Unrealized Holding Losses	4
Fair Value	29,345	$ 42,950
Continuous Unrealized Loss Position less than 12 Months	4
Long-term | U.S. government agency securities
Held-to-Maturity
Amortized Cost	5,022
Gross Unrealized Holding Losses	3
Fair Value	5,019
Continuous Unrealized Loss Position less than 12 Months	$ 3

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