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Employee Savings Plan (Details) (USD $)
 12 Months Ended 15 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Dec. 31, 2009
Jul. 04, 2010
Employee savings plan (Textual) [Abstract]        
Minimum age to be eligible to defined contribution plan 21      
Maximum part of pre tax salary which employee can contribute to define contribution plan 25.00%      
Company contribution per dollar of employee contribution $ 0.50     $ 0.25
Maximum contribution by company expressed as percentage of employee pre tax salary 3.00%     1.50%
Company contributions vest at end of two years 20.00%      
Company contributions vest at end of three years 40.00%      
Company contributions vest at end of four years 60.00%      
Company contributions vest at end of five years 100.00%      
Defined Contribution Plan, Cost Recognized $ 1,218,000 $ 776,000 $ 874,000