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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
1996 Incentive Plan [Member]
Dec. 31, 2011
1997 Incentive Plan [Member]
Dec. 31, 2011
1999 Incentive Plan [Member]
Dec. 31, 2007
2002 Incentive Plan [Member]
Dec. 31, 2003
2002 Incentive Plan [Member]
Dec. 31, 2011
2002 Incentive Plan [Member]
Jan. 31, 2012
Employees [Member]
Dec. 31, 2011
Employees [Member]
Dec. 31, 2010
Employees [Member]
Dec. 31, 2009
Employees [Member]
Jan. 31, 2012
Outside Directors [Member]
Dec. 31, 2011
Outside Directors [Member]
Dec. 31, 2010
Outside Directors [Member]
Dec. 31, 2009
Outside Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Share Based Compensation, Additional Shares Added             1,000,000 2,000,000                  
Shares reserved under long-term incentive plan       1,800,000 600,000 2,400,000     2,400,000                
Restricted stock vesting period, minimum (years) 3 3 3                            
Restricted stock vesting period, maximum (years) 5 5 5                            
Shares available for future grant 1,499,729                                
Share-based compensation expense $ 4,788,000 $ 3,576,000 $ 4,394,000                            
Share-based compensation, net of tax 3,000,000 2,200,000 2,700,000                            
Total intrinsic value of options exercised 1,100,000 900,000 2,600,000                            
Cash received from stock options exercised 86,000 46,000 256,000                            
Tax benefit from stock options exercised 700,000 300,000 1,000,000                            
Total fair value of restricted shares vested 4,700,000 4,500,000 3,300,000                            
Unrecognized compensation cost related to non-vested share-based compensation $ 13,200,000                                
Unrecognized compensation cost weighted average period recognized (years) 2.96                                
Restricted stock grants 258,284 240,094 208,101             256,798 246,284 228,094 196,101 20,000 12,000 12,000 12,000
Restricted stock grants, Weighted average grant date fair value $ 35.27 $ 27.36 $ 26.56             $ 32.43       $ 32.43