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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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+ References

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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)
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Contractual interest rate for funds borrowed, under the debt agreement.

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