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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair Value Measurements |  |
Marketable securities | $ 409,898 | $ 286,668
Fair Value of Financial Instruments |  |
Fair value of long-term debt | 2,566,500 | 1,939,800
Carrying amount of long-term debt | 2,545,511 | 1,927,901
Auction Rate Securities |  |
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 earnings | 161 |
Total realized and unrealized gains or (losses) included in other comprehensive income | 18 |
Settlements | (2,500) |
Recurring | Fair value |  |
Fair Value Measurements |  |
Marketable securities | 409,898 |
Cash, Cash Equivalents and Restricted Cash | 155,009 | 211,251
Auction Rate Securities |  | 2,321
Total Assets Measured at Fair Value | 564,907 | 500,240
Recurring | Fair value | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 409,885 | 286,637
Recurring | Fair value | Asset-backed securities |  |
Fair Value Measurements |  |
Marketable securities | 13 | 286,668
Recurring | Fair value | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities |  | 31
Recurring | Level 1 |  |
Fair Value Measurements |  |
Cash, Cash Equivalents and Restricted Cash | 155,009 | 211,251
Total Assets Measured at Fair Value | 155,009 | 211,251
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable securities | 409,898 |
Total Assets Measured at Fair Value | 409,898 | 286,668
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable securities | 409,885 | 286,637
Recurring | Level 2 | Asset-backed securities |  |
Fair Value Measurements |  |
Marketable securities | $ 13 | 286,668
Recurring | Level 2 | Commercial paper |  |
Fair Value Measurements |  |
Marketable securities |  | 31
Recurring | Level 3 |  |
Fair Value Measurements |  |
Auction Rate Securities |  | 2,321
Total Assets Measured at Fair Value |  | $ 2,321

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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 + Details
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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. + References 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=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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- Definition 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. + References 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=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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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. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: 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 + Details
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