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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Tax Rate [Line Items]
Income Tax Reconciliation, Permanent Differences and Other Adjustments	0.12%	0.28%	0.04%
Income Tax Reconciliation, Discrete Items	(1.05%)	0.31%	0.26%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	1.02%	(53.55%)
Effective income tax rate	7.23%	16.53%	(35.84%)
BERMUDA
Effective Tax Rate [Line Items]
Foreign income taxed at other than the statutory rate	0.00%	0.00%	0.00%
UNITED STATES
Effective Tax Rate [Line Items]
Effective income tax rate	7.85%	14.67%	17.10%
Uncertain tax position [Member]
Effective Tax Rate [Line Items]
Effective income tax rate	0.17%	0.07%	0.21%
Foreign Tax Authority [Member]
Effective Tax Rate [Line Items]
Foreign income taxed at other than the statutory rate	0.14%	0.18%	0.10%

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[Line Items] for Effective Tax Rate [Table]

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Income Tax Reconciliation, Discrete Items

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to permanent differences and all other items not otherwise listed in the existing taxonomy.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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