Fair Value of Assets and Liabilities (Level 3 by Pricing Source) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 225	$ 225
Other long-term investments	115,820	95,191
Reinsurance recoverables	3,012,653	2,996,154
Receivables from parent and affiliates	37,340	41,068
Total assets	45,104,366	50,098,263
Future policy benefits	3,134,077	3,112,411
Total liabilities	3,134,077	3,112,411
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	450
Cash equivalents	225	225
Other long-term investments	2,119	633
Reinsurance recoverables	3,012,653	2,996,154
Receivables from parent and affiliates	7,664	22,320
Total assets	3,196,912	3,175,926
Future policy benefits	3,134,077	3,112,411
Total liabilities	3,134,077	3,112,411
Level 3 | Internal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	450
Cash equivalents	225	225
Other long-term investments	1,565	0
Reinsurance recoverables	3,012,653	2,996,154
Receivables from parent and affiliates	0	0
Total assets	3,126,188	3,095,588
Future policy benefits	3,134,077	3,112,411
Total liabilities	3,134,077	3,112,411
Level 3 | External
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0
Cash equivalents	0	0
Other long-term investments	554	633
Reinsurance recoverables	0	0
Receivables from parent and affiliates	7,664	22,320
Total assets	70,724	80,338
Future policy benefits	0	0
Total liabilities	0	0
Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	127,308	116,070
Equity securities | Level 3 | Internal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	111,295	99,209
Equity securities | Level 3 | External
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	16,013	16,861
Asset-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	46,493	40,524
Asset-backed securities | Level 3 | Internal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	0	0
Asset-backed securities | Level 3 | External
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	$ 46,493	$ 40,524