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Condensed Consolidating Financial Statements (Narrative) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 3,150,000 | $ 3,150,000
Parent Percentage of Ownership in Guarantor Subsidiaries | 100.00% |
4.75% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% | 4.75%
5.00% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00%
4.75% Senior Notes Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% | 4.75%
Senior Notes [Member] | 4.75% Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 600,000 | $ 600,000
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 Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 800,000 | $ 800,000

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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 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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