| **Income Taxes (Details) - USD ($) $ in Thousands**                                                                           | 3 Months Ended | 9 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Income Tax Disclosure [Abstract]**                                                                                          |           |           |   |   |
| Current (benefit) expense                                                                                                     | $ (1,399)      | $ 29,568       | $ 41,725 | $ 67,705 |
| Deferred expense                                                                                                              | 16,694         | 1,140          | 37,318 | 11,221 |
| Total income tax provision                                                                                                    | 15,295         | 30,708         | $ 79,043 | $ 78,926 |
| **Reconciliation between the statutory federal income tax rate and the effective income tax rate from continuing operations** |           |           |   |   |
| Statutory federal income tax rate                                                                                             |           |           | 35.00% | 35.00% |
| Investment income not subject to federal tax                                                                                  |           |           | (2.70%) | (2.80%) |
| Tax credits                                                                                                                   |           |           | (7.30%) | (0.30%) |
| State income taxes, net of federal benefit                                                                                    |           |           | 2.50% | 1.90% |
| Other, net                                                                                                                    |           |           | (0.40%) | (0.70%) |
| Effective income tax rate                                                                                                     |           |           | 27.10% | 33.10% |
| **Reconciliation of unrecognized tax benefits**                                                                               |           |           |   |   |
| Additional decrease to unrecognized tax benefits                                                                              | $ 5,824        | $ (1,008)      | $ 5,824 | $ (1,008) |

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| - Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss).
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| - Definition
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 other adjustments.
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| - Definition
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 state and local income tax expense (benefit), net of federal tax expense (benefit).
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| - Definition
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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.
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| - Definition
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 income (loss) exempt from income taxes.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.
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