Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Intangible Assets [Line Items]
Weighted-average useful life	15 years 7 months 6 days
Intangible amortization expense	$ 1,223	$ 1,140
Intangible assets subject to amortization, Cost	69,957		$ 69,916
Intangible assets subject to amortization, Accumulated Amortization	(24,814)		(23,568)
Intangible assets subject to amortization, Net Book Value	45,143		46,348
Customer relationships
Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost	59,036		58,994
Intangible assets subject to amortization, Accumulated Amortization	(21,874)		(20,972)
Intangible assets subject to amortization, Net Book Value	$ 37,162		38,022
Customer relationships | Minimum
Intangible Assets [Line Items]
Weighted-average useful life	12 years
Customer relationships | Maximum
Intangible Assets [Line Items]
Weighted-average useful life	20 years
Technology and software
Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost	$ 7,100		7,101
Intangible assets subject to amortization, Accumulated Amortization	(2,399)		(2,167)
Intangible assets subject to amortization, Net Book Value	$ 4,701		4,934
Technology and software | Minimum
Intangible Assets [Line Items]
Weighted-average useful life	7 years
Technology and software | Maximum
Intangible Assets [Line Items]
Weighted-average useful life	10 years
Non-compete agreements
Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost	$ 491		491
Intangible assets subject to amortization, Accumulated Amortization	(346)		(331)
Intangible assets subject to amortization, Net Book Value	$ 145		160
Non-compete agreements | Minimum
Intangible Assets [Line Items]
Weighted-average useful life	5 years
Non-compete agreements | Maximum
Intangible Assets [Line Items]
Weighted-average useful life	8 years
Trademarks
Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost	$ 3,330		3,330
Intangible assets subject to amortization, Accumulated Amortization	(195)		(98)
Intangible assets subject to amortization, Net Book Value	$ 3,135		$ 3,232
Trademarks | Minimum
Intangible Assets [Line Items]
Weighted-average useful life	7 years 6 months
Trademarks | Maximum
Intangible Assets [Line Items]
Weighted-average useful life	10 years