Goodwill and Other Intangibles - Summary of the Company’s intangible assets other than goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Weighted average amortization period	9 years 5 months 24 days
Finite-lived intangible assets, gross	$ 52,601	$ 54,015
Accumulated amortization, finite-lived intangible assets	(38,739)	(34,087)
Net book value	13,862	19,928
Total intangible assets at net book value	14,762	20,828
Customer Relationships [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Weighted average amortization period	10 years
Finite-lived intangible assets, gross	43,859	44,669
Accumulated amortization, finite-lived intangible assets	(30,153)	(26,243)
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	8,742	9,346
Accumulated amortization, finite-lived intangible assets	(8,586)	(7,844)
Trade Names [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 900	$ 900