7. Intangible Assets

At December 31, 2012 and 2011, intangible assets subject to amortization consisted of the following:


			December 31, 2012				December 31, 2011
	Estimated Useful Life (years)		Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Technology		1 & 7.7	$	21,422	$	3,621	$	21,422	$	882
Relationships with financial advisors		20, 10.2 & 9.2		68,688		11,523		67,895		5,576
Vendor relationships		7		3,613		2,482		3,613		1,966
Covenants not-to-compete		5 & 2.2		1,773		1,551		1,724		1,219
Customer accounts		10 & 6.9		2,029		1,017		2,029		767
Trade names		7.2 & 10		12,290		2,002		12,290		288
Relationships with investment banking clients		4		2,586		2,586		2,586		2,586
Leases		6		1,004		730		1,004		574
Referral agreement		6.6		124		43		124		25
Other		6		67		53		67		42
Total			$	113,596	$	25,608	$	112,754	$	13,925

Aggregate amortization expense amounted to $11,683, $4,060 and $2,941 for the years ended December 31, 2012, 2011 and 2010, respectively. The weighted-average amortization period for total amortizable intangibles at December 31, 2012 is 8.84 years. Estimated amortization expense for each of the five succeeding years and thereafter is as follows:


2013	$	11,613
2014		11,336
2015		10,910
2016		10,711
2017		10,551
2018 – 2027		32,867
	$	87,988