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Stock Based Compensation (Details 4)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Equity Classified RSUs [Member]
      
Schedule of restricted stock unit programs outstanding      
Number of options outstanding, Beginning Balance 20,940 0 109,146
Granted 196,397 20,940  
Redeemed     (109,146)
Number of options outstanding, Ending Balance 217,337 20,940 0
Liability Classified RSUs [Member]
      
Schedule of restricted stock unit programs outstanding      
Number of options outstanding, Beginning Balance 34,847 12,100 6,033
Granted 3,150 26,000 8,500
Dividend equivalents 948 383 74
Redeemed (10,180) (3,636) (2,507)
Number of options outstanding, Ending Balance 28,765 34,847 12,100
Liability Classified DSUs [Member]
      
Schedule of restricted stock unit programs outstanding      
Number of options outstanding, Beginning Balance 174,751 141,149 92,642
Granted 25,693 31,983 47,843
Dividend equivalents 4,621 1,619 664
Number of options outstanding, Ending Balance 205,065 174,751 141,149
Restricted Stock Unit [Member]
      
Schedule of restricted stock unit programs outstanding      
Number of options outstanding, Beginning Balance 230,538 153,249 207,821
Granted 225,240 78,923 56,343
Dividend equivalents 5,569 2,002 738
Redeemed (10,180) (3,636) (111,653)
Number of options outstanding, Ending Balance 451,167 230,538 153,249