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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
U.S. Government and federally sponsored agency obligations:
Carrying Amount	$ 7,861,933	$ 7,379,290
Fair Value	7,861,933	7,379,290
Investment contract and life policy reserves, embedded derivatives, Carrying Amount	80	14
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure	80	14
Other policyholder funds, embedded derivatives, Carrying Amount	55,179	39,021
Other policyholder funds, embedded derivatives, Fair Value Disclosure	55,179	39,021
Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	7,494,053	7,091,340
Fair Value	7,494,053	7,091,340
Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	214,206	174,152
Fair Value	214,206	174,152
Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	472,156	504,414
Fair Value	472,156	504,414
Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	488,127	546,111
Fair Value	488,127	546,111
Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	1,778,741	1,708,943
Fair Value	1,778,741	1,708,943
Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	79,839	73,617
Fair Value	79,839	73,617
Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	2,953,338	2,779,415
Fair Value	2,953,338	2,779,415
Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	1,721,852	1,478,840
Fair Value	1,721,852	1,478,840
Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	137,640	99,797
Fair Value	137,640	99,797
Other investments [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	16,034	14,001
Fair Value	16,034	14,001
Level 1 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	345,083	280,305
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure	0	0
Other policyholder funds, embedded derivatives, Fair Value Disclosure	0	0
Level 1 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	21,235	24,453
Level 1 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	213,450	169,764
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	13,894	14,258
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	7,341	10,195
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	110,398	86,088
Level 1 [Member] | Other investments [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Level 2 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	7,291,908	6,925,559
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure	80	14
Other policyholder funds, embedded derivatives, Fair Value Disclosure	0	0
Level 2 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	7,247,882	6,893,467
Level 2 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	756	4,388
Level 2 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	468,694	504,414
Level 2 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	474,233	531,853
Level 2 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	1,733,575	1,678,564
Level 2 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	79,839	73,617
Level 2 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	2,868,376	2,701,645
Level 2 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	1,623,165	1,403,374
Level 2 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	27,236	13,703
Level 2 [Member] | Other investments [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	16,034	14,001
Level 3 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	224,942	173,426
Investment contract and life policy reserves, embedded derivatives, Fair Value Disclosure	0	0
Other policyholder funds, embedded derivatives, Fair Value Disclosure	55,179	39,021
Level 3 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	224,936	173,420
Level 3 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0	0
Level 3 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	3,462	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	45,166	30,379
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	77,621	67,575
Level 3 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	98,687	75,466
Level 3 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	6	6
Level 3 [Member] | Other investments [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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