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Summary of Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Mortgage loans on real estate
Principal	$ 3,044,912	$ 2,866,411
Unamortized premium (discount)	15,884	18,237
Mortgage provision allowance	(2,890)	(2,890)	(21,130)
Total mortgage loans	3,057,906	2,881,758
Mortgage loans on real estate \| Performing
Recorded investment of the mortgage loan portfolio by risk assessment category
Recorded investment	$ 3,060,796	$ 2,884,648

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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