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Debt And Interest Expense Debt and Interest Expense (Senior Notes) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | May 01, 2018
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date | Dec. 12, 2024 |  |
Debt Instrument, Face Amount |  |  | $ 1,250,000
issuance cost on senior note | $ (12,435) | $ (14,953) |
Senior Notes | $ 1,787,565 | 1,785,047 |
Due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Offering Date | Apr. 16, 2013 |  |
Debt Instrument, Maturity Date | May 01, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% |  |
Debt Instrument, Face Amount | $ 750,000 | 750,000 |
Due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Offering Date | Mar. 27, 2015 |  |
Debt Instrument, Maturity Date | Apr. 01, 2025 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |
Debt Instrument, Face Amount | $ 500,000 | 500,000 |
Due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Offering Date | Jul. 05, 2017 |  |
Debt Instrument, Maturity Date | Jul. 15, 2027 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |  |
Debt Instrument, Face Amount | $ 550,000 | $ 550,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: 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 + Details
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