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Fair Value Measurements (Details) (USD $) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Auction rate securities | Jun. 30, 2012 Recurring Fair value | Jun. 30, 2012 Recurring Fair value Bond and bond funds | Jun. 30, 2012 Recurring Fair value Commercial paper | Jun. 30, 2012 Recurring Fair value Asset backed securities | Jun. 30, 2012 Recurring Level 1 | Jun. 30, 2012 Recurring Level 2 | Jun. 30, 2012 Recurring Level 2 Bond and bond funds | Jun. 30, 2012 Recurring Level 2 Commercial paper | Jun. 30, 2012 Recurring Level 2 Asset backed securities | Jun. 30, 2012 Recurring Level 3
Fair Value Measurements |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | $ 501,332,000 | $ 497,552,000 |  | $ 501,332,000 | $ 497,410,000 | $ 3,543,000 | $ 379,000 |  | $ 501,332,000 | $ 497,410,000 | $ 3,543,000 | $ 379,000 |
Cash, Cash Equivalents and Restricted Cash |  |  |  | 128,159,000 |  |  |  | 128,159,000 |  |  |  |  |
Other Assets |  |  |  | 3,825,000 |  |  |  |  |  |  |  |  | 3,825,000
Assets Measured at Fair Value |  |  |  | 633,316,000 |  |  |  | 128,159,000 | 501,332,000 |  |  |  | 3,825,000
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (level 3) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 3,793,000 |  |  |  |  |  |  |  |  |  |
Total realized and unrealized gains or (losses) Included in other comprehensive income |  |  | 32,000 |  |  |  |  |  |  |  |  |  |
Balance at the end of the period |  |  | 3,825,000 |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  |  |  |  |  |  |  |  | 1,834,500,000 |  |  |  |
Carrying amount of long-term debt | $ 1,730,800,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + 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 210.5-02.22) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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