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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2013
Stock options
Mar. 31, 2012
Stock options
Apr. 30, 2008
Long-term incentive plan
Mar. 31, 2013
Long-term incentive plan
Apr. 22, 2008
Long-term incentive plan
Apr. 21, 2008
Long-term incentive plan
Stock-Based Compensation            
Maximum number of shares of common stock available for awards       2,175,000 2,175,000 2,000,000
Term of plan     20 years      
Shares remaining available for awards       0    
Historical volatility period of common stock used to estimate the fair value of each option grant 90 days          
Granted (in shares) 0 0        
Recognized stock-based compensation expense $ 0 $ 0        
Unrecognized compensation costs related to unvested options $ 0