INVESTMENTS (Details 2) (USD $) In Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Fixed income available-for-sale securities
Amortized Cost	$ 1,155,225	$ 1,093,869
Gross Unrealized Gains	60,262	46,236
Gross Unrealized Losses	(3,728)	(8,041)
Fair Value	1,211,759	1,132,064
Amortized cost of available-for-sale debt securities by contractual maturity
Total amortized cost	1,155,225	1,093,869
Fair value of available-for-sale debt securities by contractual maturity
Total fair value	1,211,759	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	165,399	103,133
Gross Unrealized Gains	1,274	869
Gross Unrealized Losses	(56)	(1,789)
Fair Value	166,617	102,213
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year	503	2,004
After 1 but within 5 years	4,728	4,796
After 5 but within 10 years	93,295	39,988
After 10 years	66,873	56,345
Total amortized cost	165,399	103,133
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year	503	2,021
After 1 but within 5 years	4,981	5,026
After 5 but within 10 years	93,756	39,712
After 10 years	67,377	55,454
Total fair value	166,617	102,213
Corporate
Fixed income available-for-sale securities
Amortized Cost	433,662	449,651
Gross Unrealized Gains	30,167	26,259
Gross Unrealized Losses	(3,470)	(2,977)
Fair Value	460,359	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	101,114	96,768
After 5 but within 10 years	311,732	327,171
After 10 years	20,816	24,711
Total amortized cost	433,662	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	107,229	101,864
After 5 but within 10 years	332,629	345,049
After 10 years	20,501	25,010
Total fair value	460,359	472,933
Mortgage-backed
Fixed income available-for-sale securities
Amortized Cost	239,596	243,364
Gross Unrealized Gains	16,477	11,584
Gross Unrealized Losses		(807)
Fair Value	256,073	254,141
Amortized cost of available-for-sale debt securities by contractual maturity
After 5 but within 10 years	3,402	2,521
After 10 years	236,194	240,843
Total amortized cost	239,596	243,364
Fair value of available-for-sale debt securities by contractual maturity
After 5 but within 10 years	3,645	2,677
After 10 years	252,428	251,464
Total fair value	256,073	254,141
ABS/CMO
Fixed income available-for-sale securities
Amortized Cost	60,598	47,494
Gross Unrealized Gains	2,022	2,457
Gross Unrealized Losses	(36)	(36)
Fair Value	62,584	49,915
Amortized cost of available-for-sale debt securities by contractual maturity
After 1 but within 5 years	3,147	4,882
After 5 but within 10 years	4,099	4,099
After 10 years	53,352	38,513
Total amortized cost	60,598	47,494
Fair value of available-for-sale debt securities by contractual maturity
After 1 but within 5 years	3,262	5,137
After 5 but within 10 years	4,584	4,567
After 10 years	54,738	40,211
Total fair value	62,584	49,915
Treasuries
Fixed income available-for-sale securities
Amortized Cost	21,511	15,771
Gross Unrealized Gains	486	244
Gross Unrealized Losses	(22)	(191)
Fair Value	21,975	15,824
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year	6,097	3,865
After 1 but within 5 years	15,414	7,012
After 5 but within 10 years		4,894
Total amortized cost	21,511	15,771
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year	6,143	3,915
After 1 but within 5 years	15,832	7,192
After 5 but within 10 years		4,717
Total fair value	21,975	15,824
Municipals
Fixed income available-for-sale securities
Amortized Cost	234,459	234,456
Gross Unrealized Gains	9,836	4,823
Gross Unrealized Losses	(144)	(2,241)
Fair Value	244,151	237,038
Amortized cost of available-for-sale debt securities by contractual maturity
Due within 1 year	8,336	14,004
After 1 but within 5 years	18,607	25,177
After 5 but within 10 years	100,602	74,770
After 10 years	106,914	120,505
Total amortized cost	234,459	234,456
Fair value of available-for-sale debt securities by contractual maturity
Due within 1 year	8,470	14,113
After 1 but within 5 years	19,334	26,303
After 5 but within 10 years	105,654	77,028
After 10 years	110,693	119,594
Total fair value	$ 244,151	$ 237,038

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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.

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-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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