Stockholders' Equity Note Disclosure [Text Block]: Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain (Loss) on Investments, Excluding Other than Temporary Impairments									$ 2,539	$ 4,502	$ 3,094
Net impairment losses recognized in earnings									0	1,475	228
Income taxes (benefits)									(13,794)	9,555	15,904
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	$ 17,601	$ 5,213	$ 14,307	$ 5,009	$ 8,645	$ 4,366	$ 4,637	$ 115,666	42,130	133,314	30,522
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Gain (Loss) on Investments, Excluding Other than Temporary Impairments									2,640	4,538	5,202
Net impairment losses recognized in earnings									0	1,475	228
Income (loss) before income taxes									2,640	3,063	4,974
Income taxes (benefits)									929	1,137	1,768
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total									$ 1,711	$ 1,926	$ 3,206