Annual report pursuant to Section 13 and 15(d)

Employee Benefit 401(k) Plans (Details)

v2.4.0.6
Employee Benefit 401(k) Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Benefit 401(k) Plans [Abstract]      
Maximum employee subscription rate, percentage of compensation 60.00%    
Minimum employee subscription rate, percentage of compensation 1.00%    
Employee pre-tax contributions vested percent 100.00%    
Corporation profit sharing contribution percent, per year 20.00%    
Percent vested after total service period 100.00%    
Employee's vesting rights Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Company.    
Profit sharing contributions period before partial vesting two    
Period of service before being fully vested six    
Expenses for employee benefit plan $ 0 $ 0 $ 0
Employer contribution to employee benefit plan $ 0 $ 0 $ 0