Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Corporate tax rate		21.00%		35.00%
Deferred tax assets and liabilities expected to reverse, percentage		25.00%
Additional provision for income tax expense				$ 5,868
Current [Abstract]
Federal		$ 7,701	$ 8,422	14,239
State		1,849	2,118	2,350
Current income tax expense (benefit)		9,550	10,540	16,589
Deferred [Abstract]
Federal		(2,217)	(232)	5,829
State		(474)	(207)	(270)
Deferred income tax expense (benefit)		(2,691)	(439)	5,559
Income tax expense (benefit)		6,859	10,101	22,148
Effective income tax rate reconciliation [Abstract]
Statutory rates applied to income before income taxes		6,032	8,486	15,129
State income taxes, net of Federal tax benefit		1,149	1,616	1,306
Net permanent differences		228	220	95
Other		(132)	(221)	(250)
Leases	$ (418)	(418)	0	0
Tax Act, net impact		0	0	5,868
Income tax expense (benefit)		6,859	10,101	$ 22,148
Deferred tax assets [Abstract]
Accounts receivable	545	545	530
Property and equipment	10,517	10,517	7,584
Lease liabilities	44,751	44,751	0
Leases	0	0	4,135
Accrued liabilities	9,386	9,386	8,172
Retirement benefits	504	504	266
Other	50	50	56
Total deferred tax assets	65,753	65,753	20,743
Deferred tax liabilities [Abstract]
Inventory related	7,912	7,912	7,649
Right-of-use lease assets	44,152	44,152	0
Other	491	491	550
Total deferred tax liabilities	52,555	52,555	8,199
Net deferred tax assets	$ 13,198	$ 13,198	$ 12,544