Employee Benefit Plans (Detail Textuals 4) (Long Term Incentive Plan, Restricted stock units)	1 Months Ended	12 Months Ended
	Oct. 28, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Long Term Incentive Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period for restricted stock units	3 years
Restriction on restricted stock units in percentages tied to achievement of revenue targets	25.00%
Restriction on restricted stock units in percentages tied to achievement of revenue targets	75.00%
Restricted stock units in percentages expired and forfeited		55.00%	25.00%	20.00%