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10. Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Effective tax rate 23.00% 24.00%
Unrealized Gain on Securities $ 1,059,230 $ 815,934
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 3,100