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Federal Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Federal Income Taxes [Abstract]      
Net loss reserve discounting $ 99,768,000 $ 98,014,000  
Net unearned premiums 53,191,000 49,955,000  
Employee benefits 33,100,000 27,079,000  
Long-term incentive compensation plans 8,471,000 9,209,000  
Temporary investment write-downs 13,251,000 9,340,000  
Net operating loss 4,791,000 0  
Tax credits 10,938,000 5,138,000  
Other 7,638,000 6,109,000  
Total deferred tax assets 231,148,000 204,844,000  
Deferred policy acquisition costs 74,137,000 72,840,000  
Unrealized gains on investment securities 53,996,000 30,522,000  
Other investments-related items, net 4,034,000 2,080,000  
Accelerated depreciation and amortization 6,295,000 6,168,000  
Total deferred tax liabilities 138,462,000 111,610,000  
Net deferred federal income tax asset 92,686,000 93,234,000  
Tax benefits related to compensation expense deductions for share-based compensation awards $ 16,600,000 $ 16,700,000 $ 17,400,000