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Fair Values of Financial Instruments (Reconciliation of Beginning and Ending Balances of Level 3 Liabilities) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 3,747,052 $ 2,914,948 $ 3,337,556 $ 2,530,496
Premiums less benefits 372,363 229,340 1,044,756 418,845
Change in unrealized gains, net (143,553) 122,494 (406,450) 317,441
Ending balance $ 3,975,862 $ 3,266,782 $ 3,975,862 $ 3,266,782