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Savings Plan (Details) (USD $)
 12 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 1998
Dec. 31, 1997
Dec. 31, 2012
Non Qualified Plan [Member]
Dec. 31, 2011
Non Qualified Plan [Member]
Dec. 31, 2012
Savings Plan [Member]
Dec. 31, 2012
Savings Plan [Member]
Dec. 31, 2009
Savings Plan [Member]
Dec. 31, 2012
Savings Plan [Member]
Non Qualified Plan [Member]
Savings Plan [Line Items]                      
Employee contribution to savings plan               $ 1      
Maximum matching contribution                 5.00% 6.00%  
Percentage of enrollment of base pay               3.00%      
Previous savings plan's vesting period 5 years                    
Charges recognized 2,500,000 2,500,000 2,600,000                
Liability under the restoration plan             1,600,000       1,600,000
Liability under the restoration plan, shares           78,615 70,588        
Number of common stock purchased       7,200 46,671            
Amount of common stock purchased       $ 200,000 $ 1,000,000