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Debt (Schedule Of Obligations Under Debt Arrangements) (Details) - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
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Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | $ 41,425,000 | $ 42,946,000
Senior secured credit facility | 1,280,000,000 | 1,115,000,000
Senior unsecured notes | 1,808,575,000 | 1,807,054,000
Long-term debt, Face Values | 3,130,000,000 | 2,965,000,000
Total long-term debt | 3,088,575,000 | 2,922,054,000
6.000% senior unsecured notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 7,558,000 | 7,825,000
Senior unsecured notes | $ 392,442,000 | $ 392,175,000
Senior unsecured notes, stated rate | 6.00% | 6.00%
Debt Instrument, Face Amount | $ 400,000,000 | $ 400,000,000
5.750% senior unsecured notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 4,928,000 | 5,183,000
Senior unsecured notes | $ 345,072,000 | $ 344,817,000
Senior unsecured notes, stated rate | 5.75% | 5.75%
Debt Instrument, Face Amount | $ 350,000,000 | $ 350,000,000
5.625% senior unsecured notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 7,286,000 | 7,510,000
Senior unsecured notes | $ 342,714,000 | $ 342,490,000
Senior unsecured notes, stated rate | 5.625% | 5.625%
Debt Instrument, Face Amount | $ 350,000,000 | $ 350,000,000
6.75% Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense and Discounts (Premiums) | 21,653,000 | 22,428,000
Senior unsecured notes | $ 728,347,000 | $ 727,572,000
Senior unsecured notes, stated rate | 6.75% | 6.75%
Debt Instrument, Face Amount | $ 750,000,000 | $ 750,000,000
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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + 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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