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Stock Incentive Compensation and Employee Benefit Plans (Schedule of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
2001 Stock Incentive Plans and Nonemployee Directors        
Weighted options outstanding:        
Balance, Beginning of Period (shares) 767,830 828,092 1,732,639  
Options granted (in shares) 0 0 0  
Options forfeited (in shares) 0 0 0  
Options expired (in shares) 0 0 0  
Options exercised (in shares) (359,618) (60,262) (904,547)  
Balance, End of Period (shares) 408,212 767,830 828,092 1,732,639
Weighted average exercise price:        
Weighted average exercise price, Beginning of Period (In dollars per share) $ 48.71 $ 48.77 $ 47.61  
Options granted, Weighted average exercise price (In dollars per share) 0.00 0.00 0.00  
Options forfeited, Weighted average exercise price (In dollars per share) 0.00 0.00 0.00  
Options expired, Weighted average exercise price (In dollars per share) 0.00 0.00 0.00  
Options exercised, Weighted average exercise price (In dollars per share) 45.09 49.52 46.55  
Weighted average exercise price, End of Period (In dollars per share) $ 51.90 $ 48.71 $ 48.77 $ 47.61
Weighted average remaining contractual life 1 year 7 months 6 days 2 years 2 years 10 months 24 days 3 years 8 months
Aggregate Intrinsic Value [Abstract]        
Aggregate intrinsic value $ 25,020 $ 37,246 $ 40,221 $ 58,305
Options exercised, Aggregate intrinsic value $ 21,205 $ 2,900 $ 36,800  
Range of Exercise Prices [Abstract]        
Exercise price range, lower range limit (In dollars per share) $ 37.51 $ 37.51 $ 37.51 $ 37.51
Exercise price range, upper range limit (In dollars per share) 59.66 $ 59.66 $ 59.66 $ 59.66
Total options exercisable, minimum (In dollars per share) 42.66      
Total options exercisable, maximum (In dollars per share) $ 59.66      
Total options exercisable (in shares) 408,212      
Total options exercisable, Weighted average exercise price (In dollars per share) $ 51.90      
Total options exercisable, Weighted average remaining contractual life 1 year 7 months 6 days      
Total options exercisable, Aggregate intrinsic value $ 25,020      
Premium Option Plan        
Weighted options outstanding:        
Balance, Beginning of Period (shares) 0 572,000 842,000  
Options granted (in shares) 0 0 0  
Options forfeited (in shares) 0 0 0  
Options expired (in shares) 0 0 0  
Options exercised (in shares) 0 (572,000) (270,000)  
Balance, End of Period (shares) 0 0 572,000 842,000
Weighted average exercise price:        
Weighted average exercise price, Beginning of Period (In dollars per share) $ 0.00 $ 73.62 $ 73.82  
Options granted, Weighted average exercise price (In dollars per share) 0.00 0.00 0.00  
Options forfeited, Weighted average exercise price (In dollars per share) 0.00 0.00 0.00  
Options expired, Weighted average exercise price (In dollars per share) 0.00 0.00 0.00  
Options exercised, Weighted average exercise price (In dollars per share) 0.00 73.62 74.24  
Weighted average exercise price, End of Period (In dollars per share) $ 0.00 $ 0.00 $ 73.62 $ 73.82
Weighted average remaining contractual life 0 years      
Aggregate Intrinsic Value [Abstract]        
Aggregate intrinsic value $ 0 $ 0 $ 13,567 $ 6,265
Options exercised, Aggregate intrinsic value $ 0 $ 13,414 $ 4,921  
Range of Exercise Prices [Abstract]        
Exercise price range, lower range limit (In dollars per share) $ 0 $ 0 $ 73.06 $ 73.06
Exercise price range, upper range limit (In dollars per share) 0 $ 0 $ 74.24 $ 74.24
Total options exercisable, minimum (In dollars per share) 0      
Total options exercisable, maximum (In dollars per share) $ 0      
Total options exercisable (in shares) 0      
Total options exercisable, Weighted average exercise price (In dollars per share) $ 0.00      
Total options exercisable, Weighted average remaining contractual life 0 years      
Total options exercisable, Aggregate intrinsic value $ 0