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Advances Schedule of Changes in Allowance for Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Advances [Abstract]        
Beginning balance $ 16,980 $ 35,844 $ 16,465 $ 37,952
Provision 977 (123) 3,501 3,298
Net charge-offs and other (1,472) (15,393) (3,481) (20,922)
Ending balance $ 16,485 $ 20,328 $ 16,485 $ 20,328