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9. Income Taxes (Details - Tax rate effect) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Expense at federal tax rate $ 11,225 $ 17,381 $ 21,484
State taxes, net of federal income tax effect 1,831 2,679 3,235
Stock-based compensation 682 824 1,560
Non-deductible expenses 171 145 107
Effect of change in tax rate 15,117 0 0
Other (720) (668) 315
Income tax expense $ 28,306 $ 20,361 $ 26,701