Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased (Tables)

9 Months Ended

Sep. 30, 2013

Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased [Abstract]

Components Of Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased

	December 31, 2013		December 31, 2012
Financial instruments owned:
U.S. government agency securities	$	88,930	$	123,758
U.S. government securities		10,594		3,573
Corporate securities:
Fixed income securities		483,987		396,878
Equity securities		76,709		35,472
State and municipal securities		141,274		203,927
	$	801,494	$	763,608
Financial instruments sold, but not yet purchased
U.S. government securities	$	253,221	$	162,661
U.S. government agency securities		2,068		15
Corporate securities:
Fixed income securities		135,878		150,698
Equity securities		90,015		29,247
State and municipal securities		32		87
	$	481,214	$	342,708