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Income Taxes (Provision for Income Taxes from Continuing Operations Differs from the Federal Statutory Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory rate	$ 16,788	$ 27,268	$ 17,494
State taxes, less federal effect	3,242	2,442	3,033
Federal tax credits	(3,680)	(373)	(439)
Uncertain tax positions	(3,051)	(148)	(154)
Excess tax benefit on stock based compensation	2,288	1,415	0
Net operating loss (NOL) write down	1,640	0	0
Executive compensation	1,369	160	75
Change in valuation allowance	844	660	685
Change in Indemnification Asset	643	0	0
Tax effect of Tax Reform Act	0	12,535	0
Domestic manufacturer's deduction	0	(1,578)	(1,363)
Intercompany debt discharge	0	0	(2,389)
Worthless stock deduction	0	0	(868)
Other	629	462	190
Provision for income taxes	$ 16,136	$ 14,943	$ 16,264
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21.00%	35.00%	35.00%
State taxes, less federal effect	4.10%	3.10%	6.10%
Federal tax credits	(4.60%)	(0.50%)	(0.90%)
Uncertain tax positions	(3.80%)	(0.20%)	(0.30%)
Excess tax benefit on stock based compensation	(2.90%)	(1.80%)	0.00%
Net operating loss (NOL) write down	2.10%	0.00%	0.00%
Executive compensation	1.70%	0.20%	0.20%
Change in valuation allowance	1.10%	0.80%	1.40%
Change in Indemnification Asset	0.80%	0.00%	0.00%
Tax effect of Tax Reform Act	(0.00%)	16.10%	(0.00%)
Domestic manufacturer's deduction	(0.00%)	(2.00%)	(2.70%)
Intercompany debt discharge	(0.00%)	(0.00%)	(4.80%)
Worthless stock deduction	(0.00%)	(0.00%)	(1.70%)
Other	0.70%	0.70%	0.20%
Effective income tax rate, percentage	20.20%	19.20%	32.50%

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