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INVESTMENTS (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | $ 447,063 | $ 412,039
Fair Value | 447,088 | 412,087
Certificates of deposit | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 22,043 | 22,045
Fair Value | 22,043 | 22,045
Commercial paper | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 9,990 | 5,991
Fair Value | 9,990 | 5,991
Municipal securities | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 400,504 | 367,819
Fair Value | 400,529 | 367,867
Auction rate securities | Due 11 - 20 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 11,053 | 11,102
Fair Value | 11,053 | 11,102
Auction rate securities | Due 21 - 30 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 3,473 | 5,082
Fair Value | $ 3,473 | $ 5,082

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- Definition This item represents the cost of debt and equity securities 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. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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