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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2013
INVESTMENTS |
Summary of investments in held-to-maturity, available-for-sale and trading securities |
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 |  |  |  |  |
December 31, 2012 |  | 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: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 16,040 |  | $ | - |  | $ | - |  | $ | 16,040 |  | $ | - |  | $ | - |
Certificates of deposit |  | 2,201 |  | - |  | - |  | 2,201 |  | - |  | - |
Municipal securities |  | 77,038 |  | - |  | 11 |  | 77,027 |  | 11 |  | - |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  | 3,310 |  | 2,483 |  | - |  | 5,793 |  | - |  | - |
Total |  | $ | 98,589 |  | $ | 2,483 |  | $ | 11 |  | 101,061 |  | $ | 11 |  | $ | - |
Trading |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 1,763 |  |  |  |  |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  | 15,600 |  |  |  |  |
Total |  |  |  |  |  |  |  | $ | 118,424 |  |  |  |  |
Schedule of net gain (loss) recognized through earnings on trading securities |
|  | 2013 |  | 2012 |  | 2011 |
(Loss) on transfer from available-for-sale to trading |  | $ | - |  | $ | - |  | $ | (2,438 | )
Gain on trading securities sold |  | 255 |  | 1,130 |  | 2,604 |
Gain (loss) on trading securities held |  | 816 |  | 753 |  | (210 | )
Gain (loss) on trading securites |  | $ | 1,071 |  | $ | 1,883 |  | $ | (44 | )
Summarizes the underlying contractual maturities of the Company's investments |
|  | December 31, 2013 |  | December 31, 2012 |
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
Less than 1 year: |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | - |  | $ | - |  | $ | 16,040 |  | $ | 16,040 |
Certificates of deposit |  | 22,045 |  | 22,045 |  | 2,201 |  | 2,201 |
Commercial paper |  | 5,991 |  | 5,991 |  | - |  | - |
Municipal securities |  | 367,819 |  | 367,867 |  | 77,038 |  | 77,027 |
U.S. government agency securities |  | - |  | - |  | - |  | - |
Due 11 - 20 years: |  |  |  |  |  |  |  |  |
Auction rate securities |  | 11,102 |  | 11,102 |  | 10,748 |  | 10,748 |
Due 21 - 30 years: |  |  |  |  |  |  |  |  |
Auction rate securities |  | 5,082 |  | 5,082 |  | 9,925 |  | 12,408 |
Total |  | $ | 412,039 |  | $ | 412,087 |  | $ | 115,952 |  | $ | 118,424 |

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- Definition Tabular disclosure of investments in trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c),(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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