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Other Assets - Schedule of Other Assets (Footnote) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Other Assets [Abstract]        
Escrow deposit       $ 52,900
Other prepaid expense $ 36,400   $ 34,900  
Allowance for financing notes 10,500   $ 4,400  
Provision for loan losses on automotive dealer financing notes $ 6,100 $ 50