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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate | 20.00% |  |  | 19.00% |  |
U.S. federal statutory income tax rate |  |  |  | 21.00% |  | 31.50%
Measurement period taxes |  |  |  | 1 year |  |
Income taxes | $ 7,768 |  | $ 12,010 | $ 17,734 | $ 25,445 |
Tax benefit - excluding dividend tax reversal [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  |  | 27.00% |  |
Prior to Tax Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  | 36.00% |  | 34.00% |
U.S. federal statutory income tax rate |  |  |  |  | 35.00% |
Subsequent to Tax Cuts and Jobs Act [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  | 19.00% |  | 24.00% |
U.S. federal statutory income tax rate |  |  |  |  | 21.00% |
Income taxes |  | $ 4,500 | $ 10,500 |  | $ 10,500 |

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