Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets [Abstract]

Changes in carrying amount of goodwill

Balance at December 31, 2011	$	46,233
Additions		29,589
Balance at June 30, 2012	$	75,822

Schedule of acquired intangible assets

	December 31, 2011						June 30, 2012
	Gross						Gross
	carrying		Accumulated				carrying		Accumulated
	amount		amortization		Net		amount		amortization		Net
Amortized intangible assets:
Client contracts and broker relationships	$	26,534	$	15,206	$	11,328	$	44,424	$	17,079	$	27,345
Trade names		1,020		542		478		2,010		663		1,347
Technology		2,580		2,177		403		7,542		3,104		4,438
Noncompete agreements		2,011		1,665		346		2,011		1,685		326
Favorable lease		—		—		—		1,121		42		1,079
Total	$	32,145	$	19,590	$	12,555	$	57,108	$	22,573	$	34,535

Schedule of estimated amortization expense

2012	$	3,370
2013		5,834
2014		5,288
2015		3,792
2016		3,521
Thereafter		12,730
Total	$	34,535