Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Intangible Assets, Net [Abstract]
Gross carrying amounts	$ 80,516	$ 80,144
Accumulated amortization	(29,810)	(26,736)
Net carrying amounts	50,706	53,408
Customer Relationships [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	68,959	68,959
Accumulated amortization	(26,196)	(23,397)
Net carrying amounts	42,763	45,562
Non-Compete Agreements [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	959	1,235
Accumulated amortization	(503)	(719)
Net carrying amounts	456	516
Customer Backlog [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	350	350
Accumulated amortization	(183)	(88)
Net carrying amounts	167	262
Trade Name [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	100	100
Accumulated amortization	(58)	(33)
Net carrying amounts	42	67
Internally Developed Software [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	10,148	9,500
Accumulated amortization	(2,870)	(2,499)
Net carrying amounts	$ 7,278	$ 7,001