Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Intangible Assets, Net [Abstract]
Gross carrying amounts	$ 79,607	$ 80,144
Accumulated amortization	(31,642)	(26,736)
Net carrying amounts	47,965	53,408
Customer Relationships [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	67,673	68,959
Accumulated amortization	(27,620)	(23,397)
Net carrying amounts	40,053	45,562
Non-Compete Agreements [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	858	1,235
Accumulated amortization	(489)	(719)
Net carrying amounts	369	516
Customer Backlog [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	270	350
Accumulated amortization	(188)	(88)
Net carrying amounts	82	262
Trade Name [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	100	100
Accumulated amortization	(83)	(33)
Net carrying amounts	17	67
Internally Developed Software [Member]
Intangible Assets, Net [Abstract]
Gross carrying amounts	10,706	9,500
Accumulated amortization	(3,262)	(2,499)
Net carrying amounts	$ 7,444	$ 7,001