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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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