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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
U.S. Government and federally sponsored agency obligations:
Carrying Amount		$ 7,126,101	$ 7,158,242
Fair Value		7,126,101	7,158,242
Investments, Carrying Amount		7,385,105	7,403,467
Investments, Fair Value		151,416	149,792
Separate Account (variable annuity) assets	[1]	1,905,298	1,813,557
Separate Account (variable annuity) assets, Fair Value	[1]	1,905,298	1,813,557
Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		6,897,058	6,893,090
Fair Value		6,897,058	6,893,090
Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Carrying Amount		117,779	142,039
Investments, Fair Value		117,779	142,039
Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		526,426	535,726
Fair Value		526,426	535,726
Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		602,587	538,199
Fair Value		602,587	538,199
Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		1,648,449	1,647,822
Fair Value		1,648,449	1,647,822
Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		66,690	59,536
Fair Value		66,690	59,536
Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		2,642,268	2,834,749
Fair Value		2,642,268	2,834,749
Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		1,410,638	1,277,058
Fair Value		1,410,638	1,277,058
Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount		99,318	110,655
Fair Value		99,318	110,655
Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Carrying Amount		11,946	12,458
Investments, Fair Value		11,946	12,458
Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value		26,719	20,049
Financial Liabilities Other policyholders funds, embedded derivatives, Carrying Value		26,719	20,049
Level 1 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		229,780	262,560
Investments, Fair Value		0	0
Separate Account (variable annuity) assets, Fair Value	[1]	1,905,298	1,813,557
Level 1 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		26,458	28,381
Level 1 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value		117,779	142,039
Level 1 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 1 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		16,251	17,857
Level 1 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 1 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 1 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		10,207	10,524
Level 1 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 1 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		85,543	92,140
Level 1 [Member] | Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value		0	0
Level 1 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value		0	0
Level 2 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		6,709,222	6,724,382
Investments, Fair Value		0	0
Separate Account (variable annuity) assets, Fair Value	[1]	0	0
Level 2 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		6,683,507	6,693,415
Level 2 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value		0	0
Level 2 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		526,426	535,726
Level 2 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		586,336	520,342
Level 2 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		1,618,780	1,634,194
Level 2 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		66,690	59,536
Level 2 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		2,559,337	2,749,508
Level 2 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		1,325,938	1,194,109
Level 2 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		13,769	18,509
Level 2 [Member] | Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value		11,946	12,458
Level 2 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value		0	0
Level 3 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		187,099	171,300
Investments, Fair Value		151,416	149,792
Separate Account (variable annuity) assets, Fair Value	[1]	0	0
Level 3 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		187,093	171,294
Level 3 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value		0	0
Level 3 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 3 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 3 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		29,669	13,628
Level 3 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		0	0
Level 3 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		72,724	74,717
Level 3 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		84,700	82,949
Level 3 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value		6	6
Level 3 [Member] | Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value		0	0
Level 3 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value		$ 26,719	$ 20,049
[1] Separate Account (variable annuity) liabilities are set equal to Separate Account (variable annuity) assets.

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