Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Income Taxes:
Federal		$ 19,280	$ 26,548	$ 22,198
State		43	108	30
Current Income Tax Expense (Benefit), Total		19,323	26,656	22,228
Deferred Income Taxes:
Federal		4,757	(5,600)	2,085
Deferred Income Tax Expense (Benefit), Total		4,757	(5,600)	2,085
Total income tax expense (benefit)		$ 24,080	$ 21,056	$ 24,313
Statutory tax rate	35.00%	21.00%