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Long-Term Debt 6.000% Senior Notes due 2026 (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 28, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,997,928 | $ 4,030,035 |
Parent |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,997,928 | $ 4,030,035 |
Subsidiaries, Ownership Percentage |  |  | 100.00%
Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% |
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 700,000 | $ 700,000 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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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