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Long-Term Incentive Compensation Plans:Cash Plan (Details) - Other employees [Member] $ in Millions | 12 Months Ended
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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

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- Definition The amount of expense recorded for a long-term incentive cash plan. + References No definition available. + Details
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- 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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- 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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- Definition Performance cash awards that could be awarded, as a percentage of target amount, maximum + References No definition available. + Details
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- Details
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- Details
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