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Savings Plan (Details) (USD $)
 12 Months Ended 48 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 1998
Dec. 31, 1997
Dec. 31, 2013
Savings Plan
Dec. 31, 2013
Savings Plan
Dec. 31, 2013
Non Qualified Plan
Dec. 31, 2012
Non Qualified Plan
Dec. 31, 2013
Savings Plan
Non Qualified Plan
Savings Plan [Line Items]                    
Employee contribution to savings plan           $ 1        
Maximum matching contribution             5.00%      
Previous savings plan's vesting period 5 years                  
Percentage of enrollment of base pay           3.00%        
Charges recognized 2,600,000 2,500,000 2,500,000              
Liability under the restoration plan                 1,600,000 2,200,000
Liability under the restoration plan, shares               75,726 78,615  
Number of common stock purchased       7,200 46,671          
Amount of common stock purchased       $ 200,000 $ 1,000,000