Investments Net Realized Gains/Losses on Invesments, Excluding Other Than Temporary Impairments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gain (Loss) on Investments [Line Items]
Net realized gains on investments, excluding other than temporary impairment (OTTI) losses	$ (611,000)	$ (854,000)	$ (6,687,000)	$ (2,047,000)
Fixed Maturities - Available for Sale			1,423,179,000	3,244,966,000
Fixed Maturities [Member]
Gain (Loss) on Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities			165,200,000	122,200,000
Available-for-sale Securities, Gross Realized Gains	4,030,000	2,901,000	5,048,000	4,542,000
Available-for-sale Securities, Gross Realized Losses	59,000	1,423,000	355,000	1,423,000
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	3,971,000	1,478,000	4,693,000	3,119,000
Fixed Maturities - Available for Sale			1,400,000,000	3,100,000,000
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains	0	966,000	562,000	966,000
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Gains (Losses) on Sales of Other Real Estate	(1,450,000)	(12,000)	(2,895,000)	(12,000)
Other Investments, Impairment Losses	(1,669,000)	0	(2,643,000)	0
Net Realized Gain (Loss) on Other Investments	(219,000)	(12,000)	252,000	(12,000)
Mortgage Loans on Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	$ (4,363,000)	$ (3,286,000)	$ (12,194,000)	$ (6,120,000)