Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Commissions	$ 94,022	$ 79,093
Information and post-trade services	7,816	7,779
Investment income	747	418
Other	1,306	1,283
Total revenues	103,891	88,573
Expenses
Employee compensation and benefits	27,401	24,527
Depreciation and amortization	4,693	4,681
Technology and communications	4,585	4,304
Professional and consulting fees	4,279	3,862
Occupancy	1,404	1,161
Marketing and advertising	1,886	1,778
Clearing costs	1,327	1,766
General and administrative	2,709	2,124
Total expenses	48,284	44,203
Income before income taxes	55,607	44,370
Provision for income taxes	13,144	15,407
Net income	$ 42,463	$ 28,963
Net income per common share
Basic	$ 1.15	$ 0.79
Diluted	1.11	0.77
Cash dividends declared per common share	$ 0.33	$ 0.26
Weighted average shares outstanding
Basic	36,850	36,775
Diluted	38,112	37,671