Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Intangible assets
Intangible assets, gross	$ 138,367,000		$ 138,367,000		$ 140,587,000
Less accumulated amortization	(53,436,000)		(53,436,000)		(45,275,000)
Intangible assets, net	84,931,000		84,931,000		95,312,000
Amortization of intangibles
Remainder of 2014	10,351,000		10,351,000
2014	20,270,000		20,270,000
2015	19,934,000		19,934,000
2016	16,613,000		16,613,000
2017	15,992,000		15,992,000
Thereafter	1,771,000		1,771,000
Amortization expense	5,200,000	6,800,000	10,400,000	12,700,000
Customer Relationships [Member]
Intangible assets
Intangible assets, gross	102,755,000		102,755,000		102,755,000
Trade Names [Member]
Intangible assets
Intangible assets, gross	17,312,000		17,312,000		19,532,000
Restrictive Covenant [Member]
Intangible assets
Intangible assets, gross	$ 18,300,000		$ 18,300,000		$ 18,300,000