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Income Taxes Income Tax Expense (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) |
| December 31, 2019 |  | December 31, 2018
Corporate income taxes payable | $ | 29 |  |  | $ | 906 |
Unrecognized tax benefits | 958 |  |  | 8,590 |
Interest accrued | 215 |  |  | 922 |
Penalties | 287 |  |  | 402 |
Income taxes payable | $ | 1,489 |  |  | $ | 10,820 |
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Current taxes: |  |  |  |  |
Bermuda | $ | — |  |  | $ | — |  |  | $ | — |
U.S. | (637 | ) |  | 3,164 |  |  | 36 |
Foreign | 1,166 |  |  | 1,072 |  |  | 839 |
| $ | 529 |  |  | $ | 4,236 |  |  | $ | 875 |
Deferred taxes: |  |  |  |  |
Bermuda | $ | — |  |  | $ | — |  |  | $ | — |
U.S. | 26,843 |  |  | 67,136 |  |  | (94,079 | )
Foreign | 179 |  |  | (731 | ) |  | (70 | )
| 27,022 |  |  | 66,405 |  |  | (94,149 | )
Total income taxes | $ | 27,551 |  |  | $ | 70,641 |  |  | $ | (93,274 | )
Schedule of Income before Income Tax, Domestic and Foreign |
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Bermuda sources | $ | 241,985 |  |  | $ | 128,905 |  |  | $ | 134,849 |
U.S. sources | 135,758 |  |  | 288,386 |  |  | 125,799 |
Foreign sources | 3,087 |  |  | 10,022 |  |  | (396 | )
Income (loss) before income taxes | $ | 380,830 |  |  | $ | 427,313 |  |  | $ | 260,252 |
Schedule of Effective Income Tax Rate Reconciliation | The difference between the Bermuda statutory income tax rate and the effective tax rate on the consolidated statements of operations for the periods indicated below were as follows:
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Bermuda tax rate | — | % |  | — | % |  | — | %
Change in enacted tax act | — | % |  | 1.02 | % |  | (53.55 | )%
U.S. income taxed at other than the statutory rate | 7.85 | % |  | 14.67 | % |  | 17.10 | %
Effect of uncertain tax positions | 0.17 | % |  | 0.07 | % |  | 0.21 | %
Foreign income taxed at other than the statutory rate | 0.14 | % |  | 0.18 | % |  | 0.10 | %
Effect of permanent differences | 0.12 | % |  | 0.28 | % |  | 0.04 | %
Other discrete items | (1.05 | )% |  | 0.31 | % |  | 0.26 | %
Effective income tax rate | 7.23 | % |  | 16.53 | % |  | (35.84 | )%
Summary of Unrecognized Tax Benefits | The following table summarizes unrecognized tax benefit amounts as follows (in thousands):
| December 31, 2019 |  | December 31, 2018
Beginning balance at January 1 | $ | 8,590 |  |  | $ | 8,250 |
Increase (decrease) related to tax positions | (7,248 | ) |  | 1,652 |
Lapse of statute of limitations | (333 | ) |  | (1,367 | )
Foreign exchange adjustment | (51 | ) |  | 55 |
Ending balance at December 31 | $ | 958 |  |  | $ | 8,590 |
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax assets and liabilities are comprised of the following (in thousands):
| December 31, 2019 |  | December 31, 2018
Deferred income tax assets: |  |  |
Net operating loss carryforwards | $ | 71,138 |  |  | $ | 60,173 |
Allowance for losses | 141 |  |  | 98 |
Derivative instruments | 4,899 |  |  | 934 |
Deferred income | 395 |  |  | 359 |
Accrued liabilities and other payables | 3,118 |  |  | 3,875 |
Total gross deferred tax assets | 79,691 |  |  | 65,439 |
Less: Valuation allowance | — |  |  | — |
Net deferred tax assets | $ | 79,691 |  |  | $ | 65,439 |
Deferred income tax liabilities: |  |  |
Accelerated depreciation | $ | 353,991 |  |  | $ | 318,779 |
Goodwill and other intangible amortization | 3,775 |  |  | 2,981 |
Derivative instruments | 105 |  |  | 2,306 |
Deferred income | 11,034 |  |  | 19,294 |
Deferred partnership income (loss) | 11,786 |  |  | 967 |
Other | 317 |  |  | 3,241 |
Total gross deferred tax liability | 381,008 |  |  | 347,568 |
Net deferred income tax liability | $ | 301,317 |  |  | $ | 282,129 |
Summary of Income Tax Interest and Penalties | The following table summarizes interest and penalty expense as follows (in thousands):
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Interest expense (benefit) | $ | 193 |  |  | $ | 98 |  |  | $ | 144 |
Penalty expense (benefit) | $ | (115 | ) |  | $ | (158 | ) |  | $ | (64 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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