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Basis of Presentation and Summary of Significant Accounting Policies - Carrying Values and Fair Values of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Reported Value Measurement
Debt Instrument [Line Items]
Debt instruments, excluding capital lease obligations	$ 9,729,534	$ 9,952,385
Estimate of Fair Value Measurement
Debt Instrument [Line Items]
Debt instruments, excluding capital lease obligations	$ 10,055,474	$ 9,828,274

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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