Acquired Intangible Assets (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortization of intangible assets	$ 581,000	$ 107,000	$ 107,000
Future Amortization Expense, Year One	535,000
Future Amortization Expense, Year Two	482,000
Future Amortization Expense, Year Three	404,000
Future Amortization Expense, Year Four	404,000
Future Amortization Expense, after Year Five	352,000
Customer Lists [Member]
Finite-lived Intangible Assets Acquired	3,183,000
Customer Lists [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Customer Lists [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	7 years
Noncompete Agreements [Member]
Finite-lived Intangible Assets Acquired	261,000
Finite-Lived Intangible Asset, Useful Life	5 years
Software [Member]
Finite-lived Intangible Assets Acquired	$ 234,000
Finite-Lived Intangible Asset, Useful Life	3 years
Other Intangible Assets [Member]
Finite-Lived Intangible Asset, Useful Life	15 years