Segment Information (Reconciliation of Operating Revenues to Total Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Total operating revenues	$ (88,511)	$ 98,379
Net investment gains (losses)	(737)	(1,689)
Gain (Loss) on Derivative Instruments, Net, Pretax	(131,536)	50,040
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Total operating revenues	37,622	42,381
Operating Segments | Annuities
Segment Reporting, Revenue Reconciling Item [Line Items]
Total operating revenues	27,694	29,743
Operating Segments | Life
Segment Reporting, Revenue Reconciling Item [Line Items]
Total operating revenues	9,928	12,638
Operating Segments | Corporate & Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total operating revenues	2,703	4,148
Significant Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Total operating revenues	3,437	3,499
Net investment gains (losses)	(737)	(1,689)
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (131,536)	$ 50,040