Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan (Details)

v2.4.0.6
Employee Benefit Plan (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Benefit Plan [Abstract]      
Defined Contribution Plan Requisite Service Period 90 days    
Defined Contribution Plan Minimum Hours of Service 1000 hours    
Defined contribution plan, minimum employee contribution of annual compensation 2.00%    
Defined contribution plan, maximum employee contribution of annual compensation 80.00%    
Defined contribution plan, employer match percentage 25.00%    
Defined contribution plan, maximum employee contribution matched by employer 6.00%    
Defined contribution plan, percentage at which employees vest annually in employer contributions 20.00%    
Defined Contribution Plan Minimum Years of Service Before Vesting Of Employer Contributions 2 years    
Defined Benefit Plan, Contributions by Employer $ 675 $ 626 $ 548