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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Allowance for credit losses $ 782   $ 794      
Amounts pledged 642,501   438,385      
Accumulated amortization 24,694   24,826      
Accumulated allowance 7,519   6,784      
Net accumulated depreciation 87,861   84,073      
Unamortized debt issuance expense 1,199   648      
Deferred tax assets, gross $ 60,919   $ 59,062      
Class A Stock [Member]            
Common stock, shares authorized (in shares) 50,000,000   50,000,000      
Common stock, shares issued (in shares) 13,009,648   13,261,095      
Common stock, shares outstanding (in shares) 13,009,648 13,132,775 13,261,095 13,268,439 13,259,715 13,238,486
Common stock, par value (dollars per share) $ 0.001   $ 0.001      
Class B Stock [Member]            
Common stock, shares authorized (in shares) 99,665   99,665      
Common stock, shares issued (in shares) 99,665   99,665      
Common stock, shares outstanding (in shares) 99,665   99,665      
Common stock, par value (dollars per share) $ 0.001   $ 0.001