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Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value Measurements
Marketable securities	$ 429,806	$ 415,273
Auction Rate Securities
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (level 3)
Balance at the beginning of the period	2,309
Total realized and unrealized gains or (losses) Included in other comprehensive income	4
Balance at the end of the period	2,313
Recurring
Fair Value Measurements
Marketable securities	429,806	415,273
Cash, Cash Equivalents and Restricted Cash	138,328	143,857
Other Assets	2,313	2,309
Total Assets Measured at Fair Value	570,447	561,439
Cost of cash and cash equivalents and available for sale securities	556,500	548,000
Fair value of cash and cash equivalents and available for sale securities	556,600	547,500
Recurring | Bonds and bond funds
Fair Value Measurements
Marketable securities	429,756	410,163
Recurring | Asset-backed Securities
Fair Value Measurements
Marketable securities	50	5,110
Recurring | Level 1
Fair Value Measurements
Cash, Cash Equivalents and Restricted Cash	138,328	143,857
Total Assets Measured at Fair Value	138,328	143,857
Recurring | Level 2
Fair Value Measurements
Marketable securities	429,806	415,273
Total Assets Measured at Fair Value	429,806	415,273
Fair Value of Financial Instruments
Fair value of long-term debt	2,129,600	1,813,100
Carrying amount of long-term debt	2,107,700	1,745,800
Recurring | Level 2 | Bonds and bond funds
Fair Value Measurements
Marketable securities	429,756	410,163
Recurring | Level 2 | Asset-backed Securities
Fair Value Measurements
Marketable securities	50	5,110
Recurring | Level 3
Fair Value Measurements
Other Assets	2,313	2,309	[1]
Total Assets Measured at Fair Value	$ 2,313	$ 2,309
[1] Comprised of auction rate securities which is reflected in “Other assets” in the Company’s unaudited condensed consolidated balance sheets

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