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INVESTMENTS (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 D | Dec. 31, 2011
INVESTMENTS |  |
Number of days for settlement basis, VRDNs to be liquidated at par | 7 |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | $ 441,452 | $ 434,476
Fair Value | 441,362 | 434,420
U.S. Treasuries | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 402 | 8,034
Fair Value | 402 | 8,039
Certificates of deposit | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 37,594 | 29,034
Fair Value | 37,594 | 29,035
Corporate bonds | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost |  | 2,022
Fair Value |  | 2,022
Municipal securities | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 330,546 | 284,605
Fair Value | 330,457 | 284,541
U.S. government agency securities | Less than 1 year |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 19,988 | 16,005
Fair Value | 19,987 | 16,007
Variable rate demand notes | Due 1 - 10 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost |  | 5,775
Fair Value |  | 5,775
Variable rate demand notes | Due 11 - 20 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 6,801 | 12,716
Fair Value | 6,801 | 12,716
Variable rate demand notes | Due 21 - 30 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 18,082 | 27,902
Fair Value | 18,082 | 27,902
Variable rate demand notes | Due 31 - 40 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 6,175 | 12,532
Fair Value | 6,175 | 12,532
Auction rate securities | Due 11 - 20 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 5,350 | 5,158
Fair Value | 5,350 | 5,158
Auction rate securities | Due 21 - 30 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost | 16,514 | 25,134
Fair Value | 16,514 | 25,134
Auction rate securities | Due 31 - 40 years |  |
Disclosure of underlying contractual maturities of investments |  |
Amortized Cost |  | 5,559
Fair Value |  | $ 5,559

X
- 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 Represents the number of days for settlement basis, on which investment securities will be liquidated at par. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include 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 -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph a, f, g Reference 7: 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=6956420&loc=d3e24584-111560 + Details
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