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Fair Value of Financial Instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments    
Other investments, Carrying Amount $ 7,089,680 $ 6,539,473
Financial Liabilities    
Fixed annuity contract liabilities, Carrying Amount 3,629,065 3,515,865
Fixed annuity contract liabilities, Fair value 3,408,658 3,302,333
Policyholder account balances on interest-sensitive life contracts, Carrying Amount 77,848 78,598
Policyholder account balances on interest-sensitive life contracts, Fair value 78,917 79,678
Other policyholder funds, Carrying Amount 340,137 346,292
Other policyholder funds, Fair Value 340,137 346,292
Short-term debt, Carrying Amount 38,000 38,000
Short-term debt, Fair Value 38,000 38,000
Long-term debt, Carrying Amount 199,907 199,874
Long-term debt, Fair Value 214,597 218,565
Other liabilities, repurchase agreement obligations, Carrying Amount 139,959 25,864
Other liabilities, repurchase agreement obligations, Fair Value 139,959 25,864
Other investments [Member]
    
Investments    
Other investments, Carrying Amount 142,257 140,685
Other investments, Fair Value 146,547 144,921
Level 1 [Member]
    
Financial Liabilities    
Fixed annuity contract liabilities, Fair value 0 0
Policyholder account balances on interest-sensitive life contracts, Fair value 0 0
Other policyholder funds, Fair Value 0 0
Short-term debt, Fair Value 0 0
Long-term debt, Fair Value 214,597 218,565
Other liabilities, repurchase agreement obligations, Fair Value 0 0
Level 1 [Member] | Other investments [Member]
    
Investments    
Other investments, Fair Value 0 0
Level 2 [Member]
    
Financial Liabilities    
Fixed annuity contract liabilities, Fair value 0 0
Policyholder account balances on interest-sensitive life contracts, Fair value 0 0
Other policyholder funds, Fair Value 250,044 250,000
Short-term debt, Fair Value 38,000 38,000
Long-term debt, Fair Value 0 0
Other liabilities, repurchase agreement obligations, Fair Value 139,959 25,864
Level 2 [Member] | Other investments [Member]
    
Investments    
Other investments, Fair Value 0 0
Level 3 [Member]
    
Financial Liabilities    
Fixed annuity contract liabilities, Fair value 3,408,658 3,302,333
Policyholder account balances on interest-sensitive life contracts, Fair value 78,917 79,678
Other policyholder funds, Fair Value 90,093 96,292
Short-term debt, Fair Value 0 0
Long-term debt, Fair Value 0 0
Other liabilities, repurchase agreement obligations, Fair Value 0 0
Level 3 [Member] | Other investments [Member]
    
Investments    
Other investments, Fair Value $ 146,547 $ 144,921