Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Tables)

12 Months Ended

Dec. 31, 2017

Trading Securities Balance Sheet Reported Amounts [Abstract]

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

The components of financial instruments owned and financial instruments sold, but not yet purchased, at December 31, 2017 and 2016, are as follows (in thousands):

	December 31,
	2017		2016
Financial instruments owned:
U.S. government securities	$	13,466	$	9,951
U.S. government agency securities		147,223		89,833
Mortgage-backed securities:
Agency		329,691		305,774
Non-agency		75,154		28,402
Corporate securities:
Fixed income securities		329,179		269,561
Equity securities		46,802		32,044
Sovereign debt		32,470		30,385
State and municipal securities		169,699		159,095
	$	1,143,684	$	925,045
Financial instruments sold, but not yet purchased:
U.S. government securities	$	442,402	$	362,536
U.S. government agency securities		10,348		20,549
Mortgage-backed securities:
Agency		86,612		94,552
Non-agency		—		1
Corporate securities:
Fixed income securities		180,755		175,301
Equity securities		38,510		18,395
Sovereign debt		20,236		27,667
State and municipal securities		—		31
	$	778,863	$	699,032