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Fair Value (Fair Value Measurements Using Significant Unobservable Inputs for Equity Index Put Option Contracts) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value [Abstract]        
Beginning Balance $ 1,772,458   $ 1,773,214  
Total gains or (losses) (realized/unrealized) Included in earnings (47,090) (47,846)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements
Transfers in and/or (out) of Level 3
Ending Balance 1,725,367   1,725,367  
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date