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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Statutory rate | $ 17,800 | $ 16,788 | $ 27,268
State taxes, less federal effect | 3,219 | 3,242 | 2,442
Federal tax credits | (1,967) | (3,680) | (373)
Excess tax benefit on stock based compensation | (961) | (2,288) | (1,415)
Uncertain tax positions | (260) | (3,051) | (148)
Executive compensation | 1,132 | 1,369 | 160
Change in valuation allowance | 88 | 844 | 660
Net operating loss (NOL) write down | 0 | 1,640 | 0
Change in Indemnification Asset | 0 | 643 | 0
Tax effect of Tax Reform Act | 0 | 0 | (12,535)
Domestic manufacturer's deduction | 0 | 0 | (1,578)
Other | 621 | 629 | 462
Provision for income taxes | $ 19,672 | $ 16,136 | $ 14,943
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Statutory rate | 21.00% | 21.00% | 35.00%
State taxes, less federal effect | 3.80% | 4.10% | 3.10%
Federal tax credits | (2.30%) | (4.60%) | (0.50%)
Excess tax benefit on stock based compensation | (1.10%) | (2.90%) | (1.80%)
Uncertain tax positions | (0.30%) | (3.80%) | (0.20%)
Executive compensation | 1.30% | 1.70% | 0.20%
Change in valuation allowance | 0.10% | 1.10% | 0.80%
Net operating loss (NOL) write down | 0.00% | 2.10% | 0.00%
Change in Indemnification Asset | 0.00% | 0.80% | 0.00%
Tax effect of Tax Reform Act | 0 | 0 | (0.161)
Domestic manufacturer's deduction | 0.00% | 0.00% | (2.00%)
Other | 0.70% | 0.70% | 0.70%
Effective income tax rate, percentage | 23.20% | 20.20% | 19.20%

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