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9. Income Taxes (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net deferred tax asset $ 32,400    
Unrecognized tax benefits $ 0    
Statutory federal rate 35.00%    
Income tax expense $ 28,306 $ 20,361 $ 26,701
Effect of change in tax rate 15,117 $ 0 $ 0
Excluding the impact of the Tax Act, income tax expense 13,200    
Operating Income (Loss) [Member]      
Net deferred tax asset 5,800    
State [Member]      
Net deferred tax asset 9,600    
Net operating loss carryforwards $ 12,300    
Net operating losses expire Dec. 31, 2018    
Federal [Member]      
Net deferred tax asset $ 22,800