Goodwill and Intangible Assets Intangibles (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 131,061	$ 131,107
Accumulated Amortization	67,485	61,618
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	117,755	117,794
Accumulated Amortization	60,244	55,157
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,888	3,888
Accumulated Amortization	3,735	3,569
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,018	8,025
Accumulated Amortization	2,320	1,939
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,400	1,400
Accumulated Amortization	$ 1,186	$ 953