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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
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 7,051,000 $ 6,254,466 $ 6,563,288 $ 5,983,622
Premiums less benefits 497,689 44,632 909,191 135,761
Change in fair value, net 3,676 199,917 79,886 379,632
Ending balance $ 7,552,365 $ 6,499,015 $ 7,552,365 $ 6,499,015