Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Taxes
Provisional income tax expense	$ 8,866	$ 10,558	$ 44,689	$ 29,499
Effective tax rate (as a percent)			17.00%	18.00%
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