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

	September 30, 2013		December 31, 2012
Trading securities owned:
U.S. government agency securities	$	121,136	$	123,758
U.S. government securities		13,627		3,573
Corporate securities:
Fixed income securities		519,180		396,878
Equity securities		85,183		35,472
State and municipal securities		108,526		203,927
	$	847,652	$	763,608
Trading securities sold, but not yet purchased
U.S. government securities	$	174,688	$	162,661
U.S. government agency securities		23,248		15
Corporate securities:
Fixed income securities		213,757		150,698
Equity securities		83,881		6,281
State and municipal securities		84		87
	$	495,658	$	319,742