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10. Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Effective tax rate 22.00% 21.00% 23.00% 23.00%
Unrealized Gain on Securities $ 716,389 $ 286,398 $ 1,775,619 $ 1,102,332
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 3,400   $ 3,400