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Long-Term Incentive Compensation Plans:Cash Plan (Details) - Other employees [Member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) tranch	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Stock-Based Compensation [Abstract]
Performance cash awards that could be awarded, as a percentage of target amount, minimum	0.00%
Performance cash awards that could be awarded, as a percentage of target amount, maximum	200.00%
Number of equal tranches for annual vesting (in tranches) | tranch	3
Performance Cash Awards Target Percentage Earned		96.00%	110.00%
General and Administrative Expense [Member]
Stock-Based Compensation [Abstract]
Long-Term Incentive Cash Plan Expense | $	$ 3.9	$ 2.2	$ 1.4

X

- Definition

The amount of expense recorded for a long-term incentive cash plan.

+ References

No definition available.

+ Details

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X

- Definition

The number of equal yearly tranches over which the awards vest (on each annual anniversary of the grant date).

+ References

No definition available.

+ Details

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X

- Definition

The performance cash awards awarded to participants during the period as a percentage of the target based on the entity's EBITDA, determined in accordance with the agreement.

+ References

No definition available.

+ Details

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X

- Definition

Performance cash awards that could be awarded, as a percentage of target amount, maximum

+ References

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- Definition

Performance cash awards that could be awarded, as a percentage of target amount, minimum

+ References

No definition available.

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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.

+ References

No definition available.

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