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Stock-Based Compensation Plans and Employee Benefits (Long-term Incentive Plan) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 19,261,000 $ 15,293,000 $ 29,702,000
Unrecognized compensation cost 4,300,000    
Weighted-average period to recognize the unrecognized compensation cost 0 years 4 months 2 days    
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 5,200,000    
Long-term Incentive Plan 2009
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares that may be awarded 8,000,000    
Maximum additional number of shares that can be awarded provided that previously granted shares under the 1996 Plan either expire, are cancelled or forfeited 500,000    
Long-term Incentive Plan 2006
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares that may be awarded 4,550,000    
Number of shares available for grant designated as incentive stock options 1,000,000    
Long-term Incentive Plan 2006 and 2009
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for issuance 4,000,000