Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income taxes currently payable	$ 9,391	$ 12,757	$ 31,671	$ 23,074
Deferred income taxes	6,202	2,859	4,616	4,940
Provision for income taxes	$ 15,593	$ 15,616	$ 36,287	$ 28,014

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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