Goodwill and Intangible Assets (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets (Additional Textual) [Abstract]
Impairment of goodwill			$ 0
Amortization expense for intangible assets	$ 600,000	$ 400,000	$ 1,700,000	$ 1,200,000
Customer relationships [Member] | Minimum [Member]
Goodwill and Intangible Assets (Textual) [Abstract]
Period of amortization of intangible assets			5 years
Customer relationships [Member] | Maximum [Member]
Goodwill and Intangible Assets (Textual) [Abstract]
Period of amortization of intangible assets			10 years