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Debt (Summary Of Long-Term Debt) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jul. 28, 2017 | Dec. 31, 2016 | Mar. 30, 2016 | Dec. 17, 2012
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 3,150,000 |  | $ 2,858,000 |  |
Debt Instrument, Unamortized Discount | (33,776) |  | (23,675) |  |
Unamortized Debt Issuance Expense | (16,967) | $ (9,400) | (15,062) |  |
Long-term Debt, Net | 3,099,257 |  | 2,819,263 |  |
Current portion of long-term debt | 0 |  | 222,000 |  |
Long-term debt, net | 3,099,257 |  | 2,597,263 |  |
Term-A Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Net | 737,140 |  | 1,245,175 |  |
4.75% Senior Notes Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Net | 784,757 |  |  |  |
5.00% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  | $ (17,500) |
Long-term Debt, Net | 984,056 |  | 981,949 |  |
4.75% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | $ (10,500)
Long-term Debt, Net | 593,304 |  | 592,139 |  |
Senior Notes [Member] | 4.75% Senior Notes Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 800,000 |  | 0 |  |
Senior Notes [Member] | 5.00% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 1,000,000 |  | 1,000,000 |  |
Senior Notes [Member] | 4.75% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | 600,000 |  | 600,000 |  |
Secured Debt [Member] | Term-A Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross | $ 750,000 | $ 750,000 | $ 1,258,000 |  |

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: 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 + Details
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