Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Intangible assets
Intangible assets, gross	$ 138,367,000		$ 140,587,000
Less accumulated amortization	(48,246,000)		(45,275,000)
Intangible assets, net	90,121,000		95,312,000
Amortization of intangibles
Remainder of 2014	15,542,000
2015	20,270,000
2016	19,934,000
2017	16,613,000
2018	15,992,000
Thereafter	1,770,000
Amortization expense	5,200,000	5,900,000
Client relationships
Intangible assets
Intangible assets, gross	102,755,000		102,755,000
Client relationships | Minimum
Intangible assets
Useful Life	5 years
Client relationships | Maximum
Intangible assets
Useful Life	10 years
Trade name
Intangible assets
Intangible assets, gross	17,312,000		19,532,000
Trade name | Minimum
Intangible assets
Useful Life	3 years
Trade name | Maximum
Intangible assets
Useful Life	5 years
Restrictive covenant
Intangible assets
Intangible assets, gross	$ 18,300,000		$ 18,300,000
Restrictive covenant | Minimum
Intangible assets
Useful Life	3 years
Restrictive covenant | Maximum
Intangible assets
Useful Life	7 years