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Organization and Summary of Significant Accounting Policies - Maintenance, Repair and Operations (MRO) Materials (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Maintenance, Repair and Operations (MRO) Materials [Abstract]
Maintenance, Repair and Operations (MRO) Materials Amortization	$ 62.4	$ 67.7	$ 62.4

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- Definition

Maintenance, Repair and Operations (MRO) Materials [Abstract]

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No definition available.

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- Definition

Maintenance, Repair and Operations (MRO) Materials Amortization

+ References

No definition available.

+ Details

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