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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2019
Income Tax Disclosure [Abstract] |
Summary of Provision for Income Taxes and Corresponding Effective Tax Rate | A summary of the provision for income taxes and the corresponding effective tax rate for the three and nine months ended September 30, 2019 and September 30, 2018, is shown below (in thousands, except effective tax rates):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Income tax expense |  | $ | 6,771 |  |  | $ | 3,688 |  |  | $ | 19,214 |  |  | $ | 9,807 |
Earnings before income tax |  | $ | 22,658 |  |  | $ | 3,333 |  |  | $ | 46,266 |  |  | $ | 39,077 |
Effective tax rate |  |  | 29.9 | % |  |  | 110.7 | % |  |  | 41.5 | % |  |  | 25.1 | %
Income tax expense excluding impairment loss |  | $ | 6,771 |  |  | $ | 3,688 |  |  | $ | 19,214 |  |  | $ | 9,807 |
Earnings before income tax excluding impairment loss |  | $ | 23,495 |  |  | $ | 14,809 |  |  | $ | 67,472 |  |  | $ | 50,553 |
Effective tax rate excluding impairment loss |  |  | 28.8 | % |  |  | 24.9 | % |  |  | 28.5 | % |  |  | 19.4 | %

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