Operating Lease Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year ending December 31, 2013	$ 4,309
2014	2,246
2015	1,375
2016	932
2017	225
2018 and after	162
Total minimum lease payments	9,249
Operating Leases, Rent Expense	$ 5,860	$ 6,233	$ 5,719