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Shareholders' Equity (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Unvested Restricted Stock
Dec. 31, 2010
Unvested Restricted Stock
Dec. 31, 2009
Unvested Restricted Stock
Dec. 31, 2008
Unvested Restricted Stock
Dec. 31, 2011
RSUs
Non-employee director
Y
Dec. 31, 2011
SSAR Awards
Dec. 31, 2010
SSAR Awards
Dec. 31, 2009
SSAR Awards
Dec. 31, 2008
SSAR Awards
Dec. 31, 2011
2006 Plan
Dec. 31, 2011
2006 Plan
Option Awards
Dec. 31, 2011
2006 Plan
Unvested Restricted Stock
Dec. 31, 2011
2006 Plan
Unvested Restricted Stock
Non-employee director
Dec. 31, 2011
2006 Plan
RSUs
Dec. 31, 2011
2006 Plan
RSUs
Non-employee director
Y
Dec. 31, 2011
2006 Plan
SSAR Awards
Dec. 31, 2011
Stock Deferral Plan
Non-employee director
Dec. 31, 2010
Stock Deferral Plan
Non-employee director
Information pertaining to stock based awards                                    
Number of shares equivalent to each stock unit                                 1  
Fair market value of number of shares of common stock used in the calculation of stock units to be credited to each participant as of each cash dividend payment date (in shares)                                 1  
Stock units outstanding (in shares)                                 25,000 25,000
Expiration period (in years)                     P7Y         P7Y    
Aggregate carrying value of the outstanding stock units                                 $ 0.3 $ 0.2
Common stock authorized for issuance (in shares)                   4,900,000                
Outstanding and/or unvested (in shares)                               517,000    
Outstanding and/or unvested (in shares) 446,000 386,000 419,000 611,000 107,000 517,000 1,012,000 2,061,000 3,789,000     446,000   901,000        
Vesting period (in years)         1 year               1 year   1 year      
Remaining shares of common stock available for future issuance                   4,718,000                
Percentage of shares vesting one year from the grant date                             50.00%      
Percentage of shares to be issued one year from the grant date         50.00%                   50.00%      
Percentage of shares to be issued that is deferred         50.00%                   50.00%      
Deferral period for percentage of shares to be issued (in years)         3                   3