Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Measurements
Marketable securities	$ 569,080	$ 409,898
Fair Value of Financial Instruments
Carrying amount of long-term debt	2,684,215	2,545,511
Recurring
Fair Value Measurements
Marketable securities	569,080	409,898
Cash, Cash Equivalents and Restricted Cash	106,363	155,009
Total Assets Measured at Fair Value	675,443	564,907
Cost of cash and cash equivalents and available for sale securities	667,200	556,800
Fair value of cash and cash equivalents and available for sale securities	667,200	556,700
Recurring \| Bonds and bond funds
Fair Value Measurements
Marketable securities	414,578	409,885
Recurring \| Commercial paper
Fair Value Measurements
Marketable securities	154,502	13
Recurring \| Level 1
Fair Value Measurements
Cash, Cash Equivalents and Restricted Cash	106,363	155,009
Total Assets Measured at Fair Value	106,363	155,009
Recurring \| Level 2
Fair Value Measurements
Marketable securities	569,080	409,898
Total Assets Measured at Fair Value	569,080	409,898
Fair Value of Financial Instruments
Fair value of long-term debt	2,720,000	2,570,000
Carrying amount of long-term debt	2,710,000	2,570,000
Recurring \| Level 2 \| Bonds and bond funds
Fair Value Measurements
Marketable securities	414,578	409,885
Recurring \| Level 2 \| Commercial paper
Fair Value Measurements
Marketable securities	$ 154,502	$ 13

Represents information pertaining to amortized cost of cash and cash equivalents and available for sale securities.

No definition available.

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

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- Definition

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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- Definition

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

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
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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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