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Advances Schedule of Change in Allowance for Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Advances [Abstract]      
Beginning balance $ 41,901 $ 70,034 $ 38,377
Provision (2,043) 61,445 83,164
Recoveries (charge-offs), net and other (1,906) (89,578) (51,507)
Ending balance $ 37,952 $ 41,901 $ 70,034