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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
U.S. Government and federally sponsored agency obligations:
Fair Value	$ 6,345,290	$ 5,791,676
Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	684,838	724,319
Other, including U.S. Treasury securities
U.S. Government and federally sponsored agency obligations:
Fair Value	433,153	458,868
Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	1,827,497	1,686,203
Foreign government bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	45,053	45,370
Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	2,122,899	1,581,424
Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	1,231,850	1,295,492
Level 3 | Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	11,074
Level 3 | Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	59,590
Level 3 | Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	155,816
Level 3 | Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	128,283
Carrying Value
U.S. Government and federally sponsored agency obligations:
Fair Value	6,644,971	6,092,204
Separate account (variable annuity) assets	2,891,423	2,490,469
Investment contract and life policy reserves, embedded derivatives	2,474	1,314
Other policyholder funds, embedded derivatives	104,488	93,733
Carrying Value | Short-term investments
U.S. Government and federally sponsored agency obligations:
Fair Value	141,770	172,667
Carrying Value | Recurring
U.S. Government and federally sponsored agency obligations:
Fair Value	6,345,290	5,791,676
Carrying Value | Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	684,838	724,319
Carrying Value | Other, including U.S. Treasury securities
U.S. Government and federally sponsored agency obligations:
Fair Value	433,153	458,868
Carrying Value | Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	1,827,497	1,686,203
Carrying Value | Foreign government bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	45,054	45,370
Carrying Value | Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	2,122,898	1,581,424
Carrying Value | Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	1,231,850	1,295,492
Carrying Value | Equity securities
U.S. Government and federally sponsored agency obligations:
Fair Value	121,653	101,864
Carrying Value | Other investments
U.S. Government and federally sponsored agency obligations:
Fair Value	36,258	25,997
Fair Value
U.S. Government and federally sponsored agency obligations:
Fair Value	6,644,971	6,092,204
Separate account (variable annuity) assets	2,891,423	2,490,469
Investment contract and life policy reserves, embedded derivatives	2,474	1,314
Other policyholder funds, embedded derivatives	104,488	93,733
Fair Value | Short-term investments
U.S. Government and federally sponsored agency obligations:
Fair Value	141,770	172,667
Fair Value | Recurring
U.S. Government and federally sponsored agency obligations:
Fair Value	6,345,290	5,791,676
Fair Value | Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	684,838	724,319
Fair Value | Other, including U.S. Treasury securities
U.S. Government and federally sponsored agency obligations:
Fair Value	433,153	458,868
Fair Value | Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	1,827,497	1,686,203
Fair Value | Foreign government bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	45,054	45,370
Fair Value | Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	2,122,898	1,581,424
Fair Value | Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	1,231,850	1,295,492
Fair Value | Equity securities
U.S. Government and federally sponsored agency obligations:
Fair Value	121,653	101,864
Fair Value | Other investments
U.S. Government and federally sponsored agency obligations:
Fair Value	36,258	25,997
Fair Value | Level 1
U.S. Government and federally sponsored agency obligations:
Fair Value	210,140	254,670
Separate account (variable annuity) assets	2,891,423	2,490,469
Investment contract and life policy reserves, embedded derivatives	0	0
Other policyholder funds, embedded derivatives	0	0
Fair Value | Level 1 | Short-term investments
U.S. Government and federally sponsored agency obligations:
Fair Value	137,679	172,667
Fair Value | Level 1 | Recurring
U.S. Government and federally sponsored agency obligations:
Fair Value	33,226	32,169
Fair Value | Level 1 | Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 1 | Other, including U.S. Treasury securities
U.S. Government and federally sponsored agency obligations:
Fair Value	18,350	17,699
Fair Value | Level 1 | Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 1 | Foreign government bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 1 | Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	14,876	14,470
Fair Value | Level 1 | Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 1 | Equity securities
U.S. Government and federally sponsored agency obligations:
Fair Value	39,235	49,834
Fair Value | Level 1 | Other investments
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 2
U.S. Government and federally sponsored agency obligations:
Fair Value	6,079,765	5,542,356
Separate account (variable annuity) assets	0	0
Investment contract and life policy reserves, embedded derivatives	2,474	1,314
Other policyholder funds, embedded derivatives	0	0
Fair Value | Level 2 | Short-term investments
U.S. Government and federally sponsored agency obligations:
Fair Value	4,091	0
Fair Value | Level 2 | Recurring
U.S. Government and federally sponsored agency obligations:
Fair Value	5,957,301	5,464,436
Fair Value | Level 2 | Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	673,764	711,004
Fair Value | Level 2 | Other, including U.S. Treasury securities
U.S. Government and federally sponsored agency obligations:
Fair Value	414,803	441,169
Fair Value | Level 2 | Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	1,767,907	1,641,912
Fair Value | Level 2 | Foreign government bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	45,054	45,370
Fair Value | Level 2 | Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	1,952,206	1,463,002
Fair Value | Level 2 | Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	1,103,567	1,161,979
Fair Value | Level 2 | Equity securities
U.S. Government and federally sponsored agency obligations:
Fair Value	82,115	51,923
Fair Value | Level 2 | Other investments
U.S. Government and federally sponsored agency obligations:
Fair Value	36,258	25,997
Fair Value | Level 3
U.S. Government and federally sponsored agency obligations:
Fair Value	355,066	295,178
Separate account (variable annuity) assets	0	0
Investment contract and life policy reserves, embedded derivatives	0	0
Other policyholder funds, embedded derivatives	104,488	93,733
Fair Value | Level 3 | Short-term investments
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 3 | Recurring
U.S. Government and federally sponsored agency obligations:
Fair Value	354,763	295,071
Fair Value | Level 3 | Mortgage-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	11,074	13,315
Fair Value | Level 3 | Other, including U.S. Treasury securities
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 3 | Municipal bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	59,590	44,291
Fair Value | Level 3 | Foreign government bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Fair Value | Level 3 | Corporate bonds
U.S. Government and federally sponsored agency obligations:
Fair Value	155,816	103,952
Fair Value | Level 3 | Other asset-backed securities
U.S. Government and federally sponsored agency obligations:
Fair Value	128,283	133,513
Fair Value | Level 3 | Equity securities
U.S. Government and federally sponsored agency obligations:
Fair Value	303	107
Fair Value | Level 3 | Other investments
U.S. Government and federally sponsored agency obligations:
Fair Value	$ 0	$ 0

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