Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accumulated depreciation (in dollars) $ 103,418 $ 98,595
Other assets, fair value (in dollars) $ 6,250 $ 5,984
Treasury stock shares 169,649 169,649
Class A    
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock shares authorized 1,000,000,000 1,000,000,000
Common stock shares issued 38,379,858 38,379,858
Common stock shares outstanding 38,210,209 38,210,209
Class B    
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock shares authorized 175,000,000 175,000,000
Common stock shares issued 0 0
Common stock shares outstanding 0 0
Class C    
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock shares authorized 90,000,000 90,000,000
Common stock shares issued 20,976,598 20,976,598
Common stock shares outstanding 20,922,855 20,976,598
Class D    
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock shares authorized 175,000,000 175,000,000
Common stock shares issued 79,610,490 79,610,490
Common stock shares outstanding 79,610,490 79,610,490