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Treasury Stock and Share Based Awards (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
at IRR of at least 8.5% [Member]
  
Number of shares vest under restricted stock unit awards  
Number of shares vesting at IRR level of at least 8.5% 50,981
Fair value of shares vesting at IRR level of at least 8.5% $ 1,103
at IRR of at least 10.5% [Member]
  
Number of shares vest under restricted stock unit awards  
Number of shares vesting at IRR level of at least 10.5% 101,974
Fair value of shares vesting at IRR level of at least 10.5% 2,206
at IRR of at least 12.5% [Member]
  
Number of shares vest under restricted stock unit awards  
Number of shares vesting at IRR level of at least 12.5% 152,955
Fair value of shares vesting at IRR level of at least 12.5% $ 3,308