Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Income Taxes
Provisional income tax expense	$ 19,736	$ 15,932
Effective tax rate (as a percent)	15.20%	16.80%
Federal statutory tax rate (as a percent)	21.00%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration