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Advances Schedule of Change in Allowance for Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance $ 37,952 $ 41,901 $ 70,034
Provision 21,429 (2,043) 61,445
Net charge-offs and other (42,916) (1,906) (89,578)
Ending balance $ 16,465 $ 37,952 $ 41,901