Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Income Taxes | ||||
| Federal income tax at U.S. statutory rate | 23.70% | 25.30% | 24.30% | 25.30% |
| Income Tax Expense (Benefit) | $ 4,478 | $ 6,311 | $ 9,285 | $ 9,868 |
| Valuation allowance, deferred tax assets | $ 0 | $ 0 | $ 0 | $ 0 |