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9. Income Taxes (Details - Income tax expense) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Current federal tax expense $ (7,526) $ 14,369 $ 22,872
Current state tax expense (2,064) 3,305 2,671
Deferred federal tax expense 9,074 10,131 (6,329)
Deferred state tax expense (benefit) 4,357 501 1,147
Income tax expense $ 3,841 $ 28,306 $ 20,361