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Stock-Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Restricted Stock Units [Member]
Jun. 30, 2011
Restricted Stock Units [Member]
Jun. 30, 2012
Restricted Stock Units [Member]
Jun. 30, 2011
Restricted Stock Units [Member]
Jun. 30, 2012
Stock options [Member]
Jun. 30, 2012
Stock options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                  
Vesting Period                 4 years
Term of options granted                 10 years
Target performance goal related to average annual increase over 3 year period for adjusted EBITDA           10.00%      
Performance period related to adjusted EBITDA           3 years      
Percentage vested on second anniversary if target performance goal is met           50.00%      
Percentage vested on third anniversary if target performance goal is met           50.00%      
Minimum performance goal related to average annual increase for adjusted EBITDA           5.00%      
Maximum performance goal related to average annual increase for adjusted EBITDA           20.00%      
Percentage vested if minimum performance goal is met           50.00%      
Percentage vested if maximum performance goal is met           200.00%      
Grant date fair value, threshold minimum           $ 0.9      
Grant date fair value target           1.7      
Grant date fair value, threshold maximum           3.4      
Restricted stock units granted 48,474                
Fair value of vested restricted stock units       0.6 0.6 0.6 0.6    
Unrecognized compensation expense       3.7   3.7      
Remaining weighted-average vesting period           2 years 2 months 12 days   1 year  
Unrecognized restricted stock unit expense, minimum threshold       2.2   2.2      
Unrecognized restricted stock unit expense, maximum threshold       6.8   6.8      
Stock based compensation (Textual) [Abstract]                  
Share based awards   5,875,000 5,875,000            
Remaining shares for future grants   1,672,833 1,672,833            
Stock Based Compensation Expense Reversal   $ 1.2 $ 1.2