Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for credit losses	$ 2,545	$ 2,427
Amounts pledged	546,334	518,123
Office facilities, net accumulated depreciation	104,961	103,547
Net deferred tax assets	63,481	68,622
Notes receivable, net accumulated amortization	54,919	42,211
Notes receivable, net allowance for uncollectibles	$ 8,444	$ 8,606
Class A Stock
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	13,238,486	13,530,688
Common stock, outstanding (in shares)	13,238,486	13,530,688	13,377,967
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Class B Stock
Common stock, authorized (in shares)	99,680	99,680
Common stock, issued (in shares)	99,680	99,680
Common stock, outstanding (in shares)	99,680	99,680
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001