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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |  |  |
Tax benefit (expense) | $ 6,896 | $ 9,458 | $ 12,931 | $ 30,247 |
Tax impact of share-based awards |  |  | 1,200 |  |
Unrecognized tax benefits | $ 0 |  | $ 0 |  |
Minimum | Forecast |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Effective tax rate |  |  |  |  | 21.00%
Maximum | Forecast |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Effective tax rate |  |  |  |  | 23.00%

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