Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investments
Other investments, Carrying Value	$ 6,539,473	$ 6,292,097
Financial Liabilities
Fixed annuity contract liabilities, Carrying Value	3,515,865	3,257,758
Fixed annuity contract liabilities, Fair value	3,302,333	3,070,111
Policyholder account balances on interest-sensitive life contracts, Carrying Value	78,598	79,017
Policyholder account balances on interest-sensitive life contracts, Fair value	79,678	78,519
Other policyholder funds, Carrying Value	346,292	103,227
Other policyholder funds, Fair Value	346,292	103,227
Short-term debt, Carrying Value	38,000	38,000
Short-term debt, Fair Value	38,000	38,000
Long-term debt, Carrying Value	199,874	199,809
Long-term debt, Fair Value	218,565	219,319
Other liabilities, repurchase agreement obligations, Carrying Value	25,864	0
Other liabilities, repurchase agreement obligations, Fair Value	25,864	0
Other investments [Member]
Investments
Other investments, Carrying Value	140,685	134,985
Other investments, Fair Value	144,921	135,121
Level 1 [Member]
Financial Liabilities
Fixed annuity contract liabilities, Carrying Value	0	0
Policyholder account balances on interest-sensitive life contracts, Carrying Value	0	0
Other policyholder funds, Carrying Value	0	0
Short-term debt, Carrying Value	0	0
Long-term debt, Carrying Value	218,565	219,319
Other liabilities, repurchase agreement obligations, Fair Value	0	0
Level 1 [Member] | Other investments [Member]
Investments
Other investments, Carrying Value	0	0
Level 2 [Member]
Financial Liabilities
Fixed annuity contract liabilities, Carrying Value	0	0
Policyholder account balances on interest-sensitive life contracts, Carrying Value	0	0
Other policyholder funds, Carrying Value	250,000	0
Short-term debt, Carrying Value	38,000	38,000
Long-term debt, Carrying Value	0	0
Other liabilities, repurchase agreement obligations, Fair Value	25,864	0
Level 2 [Member] | Other investments [Member]
Investments
Other investments, Carrying Value	0	0
Level 3 [Member]
Financial Liabilities
Fixed annuity contract liabilities, Carrying Value	3,302,333	3,070,111
Policyholder account balances on interest-sensitive life contracts, Carrying Value	79,678	78,519
Other policyholder funds, Carrying Value	96,292	103,227
Short-term debt, Carrying Value	0	0
Long-term debt, Carrying Value	0	0
Other liabilities, repurchase agreement obligations, Fair Value	0	0
Level 3 [Member] | Other investments [Member]
Investments
Other investments, Carrying Value	$ 144,921	$ 135,121