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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, 2018 USD ($) tranch | Dec. 31, 2017 USD ($) | Dec. 31, 2016 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 |  |
General and Administrative Expense [Member] |  |  |
Stock-Based Compensation [Abstract] |  |  |
Long-Term Incentive Cash Plan Expense | $ | $ 1.4 | $ 0.0 | $ 0.0

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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 Performance cash awards that could be awarded, as a percentage of target amount, maximum + References No definition available. + Details
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