Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]: Disposal Groups, Including Discontinued Operations (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
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									$ 0	$ 117,617	$ 4,310
Discontinued Operation, Tax Effect of Discontinued Operation									0	6,813	1,762
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 0	$ 0	$ 0	$ 0	$ 892	$ 0	$ 142	$ 109,770	0	110,804	2,548
Risk Solutions Sale and Coinsurance Transaction Member | Discontinued Operations, Disposed of by Sale
Discontinued Operation, Tax Effect of Discontinued Operation										6,813
Risk Solutions Sale and Coinsurance Transaction Member | Discontinued Operations, Disposed of by Sale | Medical Stop-Loss Segment Member
Disposal Group, Including Discontinued Operation, Revenue									0	6,406	2,373
Disposal Group, Including Discontinued Operation, General and Administrative Expense									0	5,689	(1,937)
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax									0	717	4,310
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax									0	116,900	0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									0	117,617	4,310
Discontinued Operation, Tax Effect of Discontinued Operation									0	6,813	1,762
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest									$ 0	$ 110,804	$ 2,548