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Other Assets - Schedule of Changes in Allowance of Automotive Dealer Financing Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance $ 7,318 $ 10,064 $ 14,658
Ending balance 11,569 7,318 10,064
Automotive Dealer Financing Notes [Member]      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance 7,664 4,371 27
Provision (265) 3,293 4,344
Charge-offs and other (7,399) 0 0
Ending balance $ 0 $ 7,664 $ 4,371