Goodwill and Intangible Assets Intangibles (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 127,781	$ 129,420
Accumulated Amortization	75,086	72,865
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	114,785	116,268
Accumulated Amortization	67,008	64,922
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,888	3,888
Accumulated Amortization	3,888	3,888
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,708	7,864
Accumulated Amortization	2,790	2,655
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,400	1,400
Accumulated Amortization	$ 1,400	$ 1,400