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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
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 4,406,163 $ 3,337,556
Premiums less benefits 371,953 246,722
Change in fair value, net (22,203) 264,624
Ending balance $ 4,755,913 $ 3,848,902