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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summarized financial information for these segments
Insurance premiums and contract charges earned													$ 731,880	$ 715,760	$ 690,938
Net investment income													332,600	329,815	313,610
Net income (loss)	$ 21,040	$ 21,984	$ 16,183	$ 34,275	$ 30,068	$ 25,357	$ 20,452	$ 28,366	$ 34,287	$ 23,599	$ 25,995	$ 27,012	93,482	104,243	110,893
Assets	10,059,343				9,768,527				8,826,672				10,059,343	9,768,527	8,826,672
Intersegment Eliminations [Member]
Summarized financial information for these segments
Net investment income													(891)	(925)	(956)
Assets	(37,208)				(36,736)				(35,878)				(37,208)	(36,736)	(35,878)
Property and casualty [Member]
Summarized financial information for these segments
Insurance premiums and contract charges earned													595,958	581,828	561,954
Net investment income													33,461	36,790	36,208
Net income (loss)													40,043	46,907	44,433
Assets	1,098,415				1,107,962				1,001,561				1,098,415	1,107,962	1,001,561
Annuity [Member]
Summarized financial information for these segments
Insurance premiums and contract charges earned													25,378	25,540	22,575
Net investment income													228,378	222,071	208,419
Net income (loss)													43,384	45,336	44,719
Assets	7,001,411				6,683,473				5,963,348				7,001,411	6,683,473	5,963,348
Life [Member]
Summarized financial information for these segments
Insurance premiums and contract charges earned													110,544	108,392	106,409
Net investment income													71,614	71,865	69,932
Net income (loss)													14,982	17,503	20,339
Assets	1,862,719				1,858,150				1,743,084				1,862,719	1,858,150	1,743,084
Corporate and other [Member]
Summarized financial information for these segments
Net investment income													38	14	7
Net income (loss)													(4,927)	(5,503)	1,402
Assets	$ 134,006				$ 155,678				$ 154,557				$ 134,006	$ 155,678	$ 154,557

X

- Definition

The sum of insurance premiums earned, premiums earned on the income statement for all insurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, plus contract charges earned on investment and universal life-type contracts.

+ References

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.18)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=51831270

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