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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Measurements |  |
Marketable Securities | $ 295,900 | $ 360,945
Fair Value of Financial Instruments |  |
Carrying amount of long-term debt | 3,064,294 | 3,159,974
Recurring |  |
Fair Value Measurements |  |
Cost of cash and cash equivalents and available for sale securities | 549,400 | 689,400
Recurring | Fair value |  |
Fair Value Measurements |  |
Cash and cash equivalents | 253,661 | 328,384
Marketable Securities | 295,900 | 360,945
Total assets measured at fair value | 549,561 | 689,329
Recurring | Fair value | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable Securities | 200,281 | 229,783
Recurring | Fair value | Commercial paper |  |
Fair Value Measurements |  |
Marketable Securities | 95,619 | 131,162
Recurring | Level 1 |  |
Fair Value Measurements |  |
Cash and cash equivalents | 253,661 | 328,384
Total assets measured at fair value | 253,661 | 328,384
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable Securities | 295,900 | 360,945
Total assets measured at fair value | 295,900 | 360,945
Fair Value of Financial Instruments |  |
Fair value of long-term debt | 3,060,000 | 3,160,000
Carrying amount of long-term debt | 3,090,000 | 3,190,000
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable Securities | 200,281 | 229,783
Recurring | Level 2 | Commercial paper |  |
Fair Value Measurements |  |
Marketable Securities | $ 95,619 | $ 131,162

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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