Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurements
Marketable securities	$ 276,577	$ 286,668
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (level 3)
Balance	2,321
Total realized and unrealized gains or (losses) included in other comprehensive income	43
Balance	2,364
Fair Value of Financial Instruments
Carrying amount of long-term debt	2,039,817	1,927,901
Recurring
Fair Value Measurements
Marketable securities	276,577
Cash, Cash Equivalents and Restricted Cash	236,209	211,251
Auction Rate Securities	2,364	2,321
Total Assets Measured at Fair Value	515,150	500,240
Cost of cash and cash equivalents and available for sale securities	504,500	489,900
Fair value of cash and cash equivalents and available for sale securities	504,600	489,700
Recurring \| Bonds and bond funds
Fair Value Measurements
Marketable securities	276,561	286,637
Recurring \| Asset-backed Securities
Fair Value Measurements
Marketable securities	16	286,668
Recurring \| Commercial Paper
Fair Value Measurements
Marketable securities		31
Recurring \| Level 1
Fair Value Measurements
Cash, Cash Equivalents and Restricted Cash	236,209	211,251
Total Assets Measured at Fair Value	236,209	211,251
Recurring \| Level 2
Fair Value Measurements
Marketable securities	276,577
Total Assets Measured at Fair Value	276,577	286,668
Fair Value of Financial Instruments
Fair value of long-term debt	2,049,300	1,939,800
Carrying amount of long-term debt	2,061,700	1,948,800
Recurring \| Level 2 \| Bonds and bond funds
Fair Value Measurements
Marketable securities	276,561	286,637
Recurring \| Level 2 \| Asset-backed Securities
Fair Value Measurements
Marketable securities	16	286,668
Recurring \| Level 2 \| Commercial Paper
Fair Value Measurements
Marketable securities		31
Recurring \| Level 3
Fair Value Measurements
Auction Rate Securities	2,364	2,321
Total Assets Measured at Fair Value	$ 2,364	$ 2,321

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Represents information pertaining to fair value of cash and cash equivalents and available for sale securities.

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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 includes cash including restricted cash and cash equivalents.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt 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.

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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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