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Fair Value Measurements (Details) (USD $) |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Auction rate securities | Mar. 31, 2013 Recurring Fair value | Mar. 31, 2012 Recurring Fair value | Mar. 31, 2013 Recurring Fair value Bonds | Mar. 31, 2012 Recurring Fair value Bonds | Mar. 31, 2013 Recurring Fair value Asset backed securities | Mar. 31, 2012 Recurring Fair value Asset backed securities | Mar. 31, 2012 Recurring Fair value Commercial paper | Mar. 31, 2013 Recurring Level 1 | Mar. 31, 2012 Recurring Level 1 | Mar. 31, 2013 Recurring Level 2 | Mar. 31, 2012 Recurring Level 2 | Mar. 31, 2013 Recurring Level 2 Bonds | Mar. 31, 2012 Recurring Level 2 Bonds | Mar. 31, 2013 Recurring Level 2 Asset backed securities | Mar. 31, 2012 Recurring Level 2 Asset backed securities | Mar. 31, 2012 Recurring Level 2 Commercial paper | Mar. 31, 2013 Recurring Level 3 | Mar. 31, 2012 Recurring Level 3
Fair Value Measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities | $ 468,864,000 | $ 556,117,000 |  | $ 468,864,000 | $ 556,117,000 | $ 468,602,000 | $ 552,289,000 | $ 262,000 | $ 314,000 | $ 3,514,000 |  |  | $ 468,864,000 | $ 556,117,000 | $ 468,602,000 | $ 552,289,000 | $ 262,000 | $ 314,000 | $ 3,514,000 |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  | 162,630,000 | 153,325,000 |  |  |  |  |  | 162,630,000 | 153,325,000 |  |  |  |  |  |  |  |  |
Other Assets |  |  |  | 2,305,000 | 3,844,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,305,000 | 3,844,000
Total Assets Measured at Fair Value |  |  |  | 633,799,000 | 713,286,000 |  |  |  |  |  | 162,630,000 | 153,325,000 | 468,864,000 | 556,117,000 |  |  |  |  |  | 2,305,000 | 3,844,000
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (level 3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 3,844,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized and unrealized gains or (losses) Included in other comprehensive income |  |  | (11,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  | (1,528,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end of the period |  |  | 2,305,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 1,712,500,000 | 1,744,200,000 |  |  |  |  |  |  |
Carrying amount of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,610,400,000 | $ 1,642,000,000 |  |  |  |  |  |  |

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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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 (c)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: 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 6: 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 + Details
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