Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Financial Condition
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	52,300,885	52,229,962
Common stock held in treasury, at cost; shares	19,207,419	18,000,756