Fair Value of Assets and Liabilities (Level 3 by Pricing Source) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other long-term investments	$ 238,029	$ 182,157
Receivables from parent and affiliates	129,585	212,696
Future policy benefits	12,999,857	3,578,662
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other long-term investments	2,083	115,266
Cash equivalents	8,194,107	225
Reinsurance recoverables	335,189	3,012,653
Receivables from parent and affiliates	50,054	37,340
Total assets	58,339,678	45,103,812
Future policy benefits	12,040,828	3,134,077
Total liabilities	12,306,078	3,134,077
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	5,514
Other long-term investments	0	1,565
Short-term investments	450	450
Cash equivalents	375	225
Reinsurance recoverables	335,189	3,012,653
Receivables from parent and affiliates	2,795	7,664
Total assets	540,481	3,196,358
Future policy benefits	12,040,828	3,134,077
Total liabilities	12,040,828	3,134,077
Fair Value, Measurements, Recurring | Level 3 | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	151,716	127,308
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	44,442	46,493
Fair Value, Measurements, Recurring | Level 3 | Internal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	1,998
Other long-term investments		1,565
Short-term investments	450	450
Cash equivalents	375	225
Reinsurance recoverables	335,189	3,012,653
Receivables from parent and affiliates	0	0
Total assets	474,599	3,126,188
Future policy benefits	12,040,828	3,134,077
Total liabilities	12,040,828	3,134,077
Fair Value, Measurements, Recurring | Level 3 | Internal | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	136,587	111,295
Fair Value, Measurements, Recurring | Level 3 | Internal | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	0	0
Fair Value, Measurements, Recurring | Level 3 | External
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,516
Other long-term investments		0
Short-term investments	0	0
Cash equivalents	0	0
Reinsurance recoverables	0	0
Receivables from parent and affiliates	2,795	7,664
Total assets	65,882	70,170
Future policy benefits	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | External | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	15,129	16,013
Fair Value, Measurements, Recurring | Level 3 | External | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities	$ 44,442	$ 46,493