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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 4) (USD $) |  |  |  | 12 Months Ended |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Auction rate securities | Dec. 31, 2013 2011 ARS Agreement | Dec. 31, 2012 2011 ARS Agreement | Dec. 31, 2011 2011 ARS Agreement | Jun. 30, 2011 2011 ARS Agreement | Jun. 30, 2014 2011 ARS Agreement Subsequent event | Jun. 30, 2014 Put option related to auction rate securities | Jun. 30, 2014 2011 Put Option | Jun. 30, 2013 2011 Put Option | Jun. 30, 2014 2011 Put Option | Jun. 30, 2013 2011 Put Option | Oct. 01, 2013 2011 Put Option Maximum | Jul. 01, 2013 2011 Put Option Maximum
ARS Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of investments |  |  | $ 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Impairment of investments, trading securities |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | 505,651,000 | 412,039,000 | 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Trading auction rate securities, in short-term and long-term investments |  |  | 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of securities of par value |  |  |  |  |  |  | 24,500,000 |  |  |  |  |  |  | 1,000,000 | 1,000,000
Redemption of investment securities through the exercise of the put option |  |  |  |  |  |  |  |  | 3,400,000 |  |  |  |  |  |
Redemption of investment securities at par through normal market channels |  |  |  | 2,300,000 | 1,300,000 | 3,700,000 |  | 8,600,000 |  |  |  |  |  |  |
Fair market value of investments |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  |  |
Resulted (loss) gain on revaluation of investment securities included in other income (expense) |  |  |  |  |  |  |  |  |  | $ 12,000 | $ 100,000 | $ 13,000 | $ 2,600,000 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition For investments which are quantified by principal amount, the principle balance held at close of period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column B -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Article 12 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column B -Article 12 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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