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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2014
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
June 30, 2014 |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Continuous Unrealized Loss Position less than 12 Months |  | Continuous Unrealized Loss Position greater than 12 Months |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 6,007 |  | $ | - |  | $ | - |  | $ | 6,007 |  | $ | - |  | $ | - |
Commercial paper |  | 9,996 |  | - |  | - |  | 9,996 |  | - |  | - |
Municipal securities |  | 431,597 |  | 76 |  | - |  | 431,673 |  | - |  | - |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 45,232 |  | 24 |  | - |  | 45,256 |  | - |  | - |
Total |  | $ | 492,832 |  | $ | 100 |  | $ | - |  | 492,932 |  | $ | - |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 6,369 |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 6,450 |  |  |  |  |
Total |  |  |  |  |  |  |  | $ | 505,751 |  |  |  |  |
December 31, 2013 |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Continuous Unrealized Loss Position less than 12 Months |  | Continuous Unrealized Loss Position greater than 12 Months |
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 22,045 |  | $ | - |  | $ | - |  | $ | 22,045 |  | $ | - |  | $ | - |
Commercial paper |  | 5,991 |  | - |  | - |  | 5,991 |  | - |  | - |
Municipal securities |  | 367,819 |  | 48 |  | - |  | 367,867 |  | - |  | - |
Total |  | $ | 395,855 |  | $ | 48 |  | $ | - |  | 395,903 |  | $ | - |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 6,392 |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 9,792 |  |  |  |  |
Total |  |  |  |  |  |  |  | $ | 412,087 |  |  |  |  |
Schedule of net gain recognized through earnings on trading securities |
|  | Three-Months Ended June 30, |  | Six-Months Ended June 30, |
|  | 2014 |  | 2013 |  | 2014 |  | 2013 |
Gain on trading securities sold |  | $ | 138 |  | $ | - |  | $ | 269 |  | $ | - |
(Loss) gain on trading securities held |  | (121) |  | 392 |  | (185) |  | 399 |
Gain on trading securites |  | $ | 17 |  | $ | 392 |  | $ | 84 |  | $ | 399 |
Summarizes the underlying contractual maturities of the Company's investments |
|  | June 30, 2014 |  | December 31, 2013 |
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 6,007 |  | $ | 6,007 |  | $ | 22,045 |  | $ | 22,045 |
Commercial paper |  | 9,996 |  | 9,996 |  | 5,991 |  | 5,991 |
Municipal securities |  | 431,597 |  | 431,673 |  | 367,819 |  | 367,867 |
Due 1 - 10 years: |  |  |  |  |  |  |  |  |
Municipal securities |  | 45,232 |  | 45,256 |  | - |  | - |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |
Auction rate securities |  | 12,773 |  | 12,773 |  | 11,102 |  | 11,102 |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |
Auction rate securities |  | 46 |  | 46 |  | 5,082 |  | 5,082 |
Total |  | $ | 505,651 |  | $ | 505,751 |  | $ | 412,039 |  | $ | 412,087 |

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