Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes
Provisional income tax expense	$ 25,333	$ 19,891	$ 45,069	$ 35,823
Effective tax rate (as a percent)			18.60%	17.00%
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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration