Goodwill and Other Intangibles - Summary of the Company’s intangible assets other than goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Weighted average amortization period	10 years
Finite-lived intangible assets, gross	$ 47,860	$ 50,898
Accumulated amortization, finite-lived intangible assets	(43,232)	(41,785)
Net book value	4,628	9,113
Total intangible assets at net book value	$ 5,528	10,013
Customer Relationships [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Weighted average amortization period	10 years
Finite-lived intangible assets, gross	$ 41,142	42,883
Accumulated amortization, finite-lived intangible assets	$ (36,514)	(33,770)
Internally Developed Software [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Weighted average amortization period	7 years
Finite-lived intangible assets, gross	$ 6,718	8,015
Accumulated amortization, finite-lived intangible assets	(6,718)	(8,015)
Trade Names [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 900	$ 900