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Stock-Based Compensation Plans and Employee Benefits (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 5,202,000 $ 4,666,000
Unrecognized compensation cost $ 12,800,000  
Weighted-average period to recognize the unrecognized compensation cost 0 years 11 months 1 day  
Long-term Incentive Plan 2006 and 2009
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for issuance 4.0