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Debt (Schedule Of Obligations Under Debt Arrangements) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Senior secured credit facility | $ 1,210,000 | $ 1,278,200
Unamortized Debt Issuance Expense and Discounts (Premiums) | 35,288 | 36,831
Senior unsecured notes | 1,814,712 | 1,813,169
Long-term debt, Face Values | 3,060,000 | 3,128,200
Total long-term debt | 3,024,712 | 3,091,369
6.000% senior unsecured notes due May 2023 |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 6,491 | 6,758
Senior unsecured notes | $ 393,509 | $ 393,242
Senior unsecured notes, stated rate | 6.00% | 6.00%
Debt Instrument, Face Amount | $ 400,000 | $ 400,000
5.750% senior unsecured notes due February 2021 |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 3,908 | 4,163
Senior unsecured notes | $ 346,092 | $ 345,837
Senior unsecured notes, stated rate | 5.75% | 5.75%
Debt Instrument, Face Amount | $ 350,000 | $ 350,000
5.625% senior unsecured notes due June 2024 |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 6,389 | 6,614
Senior unsecured notes | $ 343,611 | $ 343,386
Senior unsecured notes, stated rate | 5.625% | 5.625%
Debt Instrument, Face Amount | $ 350,000 | $ 350,000
6.75% Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 18,500 | 19,296
Senior unsecured notes | $ 731,500 | $ 730,704
Senior unsecured notes, stated rate | 6.75% | 6.75%
Debt Instrument, Face Amount | $ 750,000 | $ 750,000
Credit Facility [Domain] |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | $ 0 | $ 0

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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. Also includes the amount of debt discount (premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References No definition available. + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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 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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