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Stock-Based Compensation Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock-based compensation expense        
Continuing operations $ 523 $ 803 $ 1,318 $ 1,553
Discontinued operations 4,187 (805) 4,499 2,942
Total 4,710 (2) 5,817 4,495
Exit of Investment Banking and Fixed Income Businesses
       
Stock-based compensation expense        
Discontinued operations $ 4,100      
Shares vested 264,000