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10. Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Effective tax rate 29.00% 19.00% 25.00% 30.00%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 3.4   $ 3.4  
U.S. Federal [Member]        
Statutory Rates 35.00% 35.00% 35.00% 35.00%