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Fair Value Measurements (Details) (USD $)			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Auction rate securities	Sep. 30, 2012 Recurring Fair value	Sep. 30, 2012 Recurring Fair value Bond and bond funds	Sep. 30, 2012 Recurring Fair value Commercial paper	Sep. 30, 2012 Recurring Fair value Asset backed securities	Sep. 30, 2012 Recurring Level 1	Sep. 30, 2012 Recurring Level 2	Sep. 30, 2012 Recurring Level 2 Bond and bond funds	Sep. 30, 2012 Recurring Level 2 Commercial paper	Sep. 30, 2012 Recurring Level 2 Asset backed securities	Sep. 30, 2012 Recurring Level 3
Fair Value Measurements
Marketable securities	$ 583,171,000	$ 497,552,000		$ 583,171,000	$ 579,302,000	$ 3,530,000	$ 339,000		$ 583,171,000	$ 579,302,000	$ 3,530,000	$ 339,000
Cash, Cash Equivalents and Restricted Cash				155,907,000				155,907,000
Other Assets				3,845,000									3,845,000
Assets Measured at Fair Value				742,923,000				155,907,000	583,171,000				3,845,000
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			52,000
Balance at the end of the period			3,845,000
Fair Value of Financial Instruments
Fair value of long-term debt									1,778,700,000
Carrying amount of long-term debt	$ 1,701,900,000

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