Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 4,407	$ 5,406
OCI before reclassifications	5,039	36,996
Deferred income tax benefit (expense)	(1,764)	(12,948)
AOCI before reclassifications, net of income tax	7,682	29,454
Amounts reclassified from AOCI	1,287	1,671
Deferred income tax benefit (expense)	(451)	(585)
Amounts reclassified from AOCI, net of income tax	836	1,086
Balance, end of period	8,518	30,540
Unrealized Investment Gains (Losses), Net of Related Offsets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,340	3,333
OCI before reclassifications	5,460	37,142
Deferred income tax benefit (expense)	(1,911)	(12,999)
AOCI before reclassifications, net of income tax	4,889	27,476
Amounts reclassified from AOCI	1,287	1,671
Deferred income tax benefit (expense)	(451)	(585)
Amounts reclassified from AOCI, net of income tax	836	1,086
Balance, end of period	5,725	28,562
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	3,067	2,073
OCI before reclassifications	(421)	(146)
Deferred income tax benefit (expense)	147	51
AOCI before reclassifications, net of income tax	2,793	1,978
Amounts reclassified from AOCI	0	0
Deferred income tax benefit (expense)	0	0
Amounts reclassified from AOCI, net of income tax	0	0
Balance, end of period	$ 2,793	$ 1,978