Investments (All Other Net Unrealized Investment Gains and Losses in AOCI) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 64,805
Balance	180,132
Other Net Unrealized Investment Gains and Losses | Net Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	111,837
Net investment gains (losses) on investments arising during the period	196,014
Reclassification adjustment for (gains) losses included in net income	15,035
Reclassification adjustment for OTTI losses excluded from net income	485
Impact of net unrealized investment (gains) losses on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders’ account balances	0
Balance	323,371
Other Net Unrealized Investment Gains and Losses | DAC and Other Costs
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(19,252)
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	0
Reclassification adjustment for OTTI losses excluded from net income	0
Impact of net unrealized investment (gains) losses on DAC and other costs	(59,669)
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders’ account balances	0
Balance	(78,921)
Other Net Unrealized Investment Gains and Losses | Future Policy Benefits and Policyholders’ Account Balances
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	2,647
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	0
Reclassification adjustment for OTTI losses excluded from net income	0
Impact of net unrealized investment (gains) losses on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders’ account balances	25,870
Balance	28,517
Other Net Unrealized Investment Gains and Losses | Deferred Income Tax (Liability) Benefit
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(33,223)
Net investment gains (losses) on investments arising during the period	(68,604)
Reclassification adjustment for (gains) losses included in net income	(5,262)
Reclassification adjustment for OTTI losses excluded from net income	(170)
Impact of net unrealized investment (gains) losses on DAC and other costs	20,884
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders’ account balances	(9,055)
Balance	(95,430)
Other Net Unrealized Investment Gains and Losses | Total net unrealized investment gains (losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	62,009
Net investment gains (losses) on investments arising during the period	127,410
Reclassification adjustment for (gains) losses included in net income	9,773
Reclassification adjustment for OTTI losses excluded from net income	315
Impact of net unrealized investment (gains) losses on DAC and other costs	(38,785)
Impact of net unrealized investment (gains) losses on future policy benefits and policyholders’ account balances	16,815
Balance	$ 177,537