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Stock Based Compensation (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Performance Based Compensation [Member]
Jun. 30, 2011
Restricted Stock Award [Member]
Jun. 30, 2011
Common Class A [Member]
1996 Equity Incentive Plan [Member]
Dec. 31, 2009
2009 Employee Stock Purchase Plan [Member]
Jun. 30, 2011
Common Class A [Member]
Stock Based Compensation (Textuals) [Abstract]              
Employee Stock Purchase Plan has reserved shares of Class A common stock         13,000,000    
The Company granted options for an aggregate shares of its Class A common stock             32,000
New employee stock purchase plan, which reserved additional shares of common stock           500,000  
Non cash compensation expense $ 4,678 $ 7,800 $ 500 $ 181      
Percentage of awards vesting on grant date       50.00%      
Percentage of awards vesting on the last day of directors term       50.00%      
Term of director       1 year      
Stock Based Compensation Additionals (Textuals) [Abstract]              
Expiration date of options granted under equity incentive plan 10 years            
Award vesting terms vesting terms ranging from three to five years and include 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date            
Maximum range of awards of the target number of shares, terms of award 100.00%            
Minimum range of awards of the target number of shares, terms of award 0.00%