INVESTMENTS (Details 2) (USD $) In Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Fixed income available-for-sale securities
Amortized Cost	$ 1,139,923	$ 1,093,869
Gross Unrealized Gains	46,195	46,236
Gross Unrealized Losses	(4,260)	(8,041)
Fair Value	1,181,858	1,132,064
Amortized cost of available-for-sale debt securities by contractual maturity
Total amortized cost	1,139,923	1,093,869
Fair value of available-for-sale debt securities by contractual maturity
Total fair value	1,181,858	1,132,064
Maturity duration for available-for-sale securities with no stated maturities	greater than 10 years	greater than 10 years
Agencies
Fixed income available-for-sale securities
Amortized Cost	145,588	103,133
Gross Unrealized Gains	624	869
Gross Unrealized Losses	(1,215)	(1,789)
Fair Value	144,997	102,213
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year	1,909	2,004
After 1 but within 5 years	4,751	4,796
After 5 but within 10 years	78,540	39,988
After 10 years	60,388	56,345
Total amortized cost	145,588	103,133
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year	1,909	2,021
After 1 but within 5 years	4,996	5,026
After 5 but within 10 years	78,094	39,712
After 10 years	59,998	55,454
Total fair value	144,997	102,213
Corporate
Fixed income available-for-sale securities
Amortized Cost	381,778	449,651
Gross Unrealized Gains	24,406	26,259
Gross Unrealized Losses	(1,729)	(2,977)
Fair Value	404,455	472,933
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year		1,001
After 1 but within 5 years	92,687	96,768
After 5 but within 10 years	273,266	327,171
After 10 years	15,825	24,711
Total amortized cost	381,778	449,651
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year		1,010
After 1 but within 5 years	99,542	101,864
After 5 but within 10 years	288,921	345,049
After 10 years	15,992	25,010
Total fair value	404,455	472,933
Mortgage-backed
Fixed income available-for-sale securities
Amortized Cost	249,128	243,364
Gross Unrealized Gains	12,554	11,584
Gross Unrealized Losses	(518)	(807)
Fair Value	261,164	254,141
Amortized cost of available-for-sale debt securities by contractual maturity
After 5 but within 10 years	3,758	2,521
After 10 years	245,370	240,843
Total amortized cost	249,128	243,364
Fair value of available-for-sale debt securities by contractual maturity
After 5 but within 10 years	4,023	2,677
After 10 years	257,141	251,464
Total fair value	261,164	254,141
ABS/CMO
Fixed income available-for-sale securities
Amortized Cost	67,558	47,494
Gross Unrealized Gains	2,172	2,457
Gross Unrealized Losses	(75)	(36)
Fair Value	69,655	49,915
Amortized cost of available-for-sale debt securities by contractual maturity
After 1 but within 5 years	7,397	4,882
After 5 but within 10 years	4,099	4,099
After 10 years	56,062	38,513
Total amortized cost	67,558	47,494
Fair value of available-for-sale debt securities by contractual maturity
After 1 but within 5 years	7,584	5,137
After 5 but within 10 years	4,567	4,567
After 10 years	57,504	40,211
Total fair value	69,655	49,915
Treasuries
Fixed income available-for-sale securities
Amortized Cost	67,044	15,771
Gross Unrealized Gains	577	244
Gross Unrealized Losses	(83)	(191)
Fair Value	67,538	15,824
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year	16,790	3,865
After 1 but within 5 years	45,355	7,012
After 5 but within 10 years	4,899	4,894
Total amortized cost	67,044	15,771
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year	16,803	3,915
After 1 but within 5 years	45,919	7,192
After 5 but within 10 years	4,816	4,717
Total fair value	67,538	15,824
Municipals
Fixed income available-for-sale securities
Amortized Cost	228,827	234,456
Gross Unrealized Gains	5,862	4,823
Gross Unrealized Losses	(640)	(2,241)
Fair Value	234,049	237,038
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year	6,577	14,004
After 1 but within 5 years	21,928	25,177
After 5 but within 10 years	85,761	74,770
After 10 years	114,561	120,505
Total amortized cost	228,827	234,456
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year	6,702	14,113
After 1 but within 5 years	22,545	26,303
After 5 but within 10 years	88,720	77,028
After 10 years	116,082	119,594
Total fair value	$ 234,049	$ 237,038

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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