Goodwill and Intangible Assets Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years 10 months 1 day
Gross Carrying Amount	$ 129,420	$ 131,107
Accumulated Amortization	72,865	61,618
Impairment of Intangible Assets, Finite-lived	0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years 3 months 12 days
Gross Carrying Amount	116,268	117,794
Accumulated Amortization	64,922	55,157
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Gross Carrying Amount	3,888	3,888
Accumulated Amortization	3,888	3,569
Trade name
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years 6 months 27 days
Gross Carrying Amount	7,864	8,025
Accumulated Amortization	2,655	1,939
Developed technology
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Gross Carrying Amount	1,400	1,400
Accumulated Amortization	$ 1,400	$ 953