Guaranteed Benefit Features (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Guaranteed Benefit Features [Abstract]
Percent of permanent life insurance in force	34.00%		34.00%		35.00%
Percent of permanent life insurance sales	28.00%	33.00%	27.00%	31.00%