INVESTMENTS (Details 4) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Fixed income securities in unrealized loss positions
Book Value	$ 542,727,000	$ 563,008,000
Fair Value	532,170,000	547,860,000
Unrealized Loss	(10,557,000)	(15,148,000)
Debt securities | NAIC Rating 1
Fixed income securities in unrealized loss positions
Book Value	511,893,000
Fair Value	503,299,000
Unrealized Loss	(8,664,000)
Percent to Total (as a Percent)	97.00%
Debt securities | NAIC Rating 2
Fixed income securities in unrealized loss positions
Book Value	14,497,000
Fair Value	14,229,000
Unrealized Loss	(268,000)
Percent to Total (as a Percent)	3.00%
Debt securities
Fixed income securities in unrealized loss positions
Book Value	526,390,000	556,636,000
Fair Value	517,458,000	541,782,000
Unrealized Loss	(8,932,000)	(14,854,000)
Percent to Total (as a Percent)	100.00%
Number of unrealized loss positions	138
Percentage of unrealized loss to fixed income portfolio (as a percent)	0.60%
Number of securities in unrealized loss positions for 12 months or longer (in months)	2
Maximum unrealized loss on securities in unrealized loss position for twelve consecutive month or longer	100,000
Common Stock
Fixed income securities in unrealized loss positions
Book Value	16,337,000	6,372,000
Fair Value	14,712,000	6,078,000
Unrealized Loss	(1,625,000)	(294,000)
Number of unrealized loss positions	34
Number of securities in unrealized loss positions for 12 months or longer (in months)	0
Maximum unrealized loss on securities in unrealized loss position for twelve consecutive month or longer	$ 1,600,000