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Share-Based Compensation Plans (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based compensation expense and income tax benefits recognized during the periods        
Share-based compensation expense $ 4,662,000 $ 5,101,000 $ 14,264,000 $ 14,186,000
Income tax benefit (1,549,000) (1,637,000) (4,876,000) (4,643,000)
Share-based compensation expense, net of tax 3,113,000 3,464,000 9,388,000 9,543,000
Summary of compensation expense recognized related to cash awards        
Cash awards 934,000 737,000 3,101,000 2,122,000
Share Based Compensation Plans (Textuals) [Abstract]        
Stock option plan granted     391,000 460,000
Weighted-average fair value per option granted     $ 13.97 $ 14.07
Awards issued but not granted     31,000  
Total unrecognized pre-tax compensation expense 28,000,000   28,000,000  
Unrecognized Compensation Costs weighted-average period (in years)     1 year 8 months 4 days  
2013 stock option grants [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Stock option plan granted, contractual term (in years)     10 years  
2012 stock option grants [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Stock option plan granted, contractual term (in years)       7 years
ROC performance based restricted stock rights, 2013 Grant [Member] | Minimum [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage 25.00%      
ROC performance based restricted stock rights, 2013 Grant [Member] | Maximum [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage 125.00%      
Stock Option and Stock Purchase Plan [Member]
       
Share-based compensation expense and income tax benefits recognized during the periods        
Share-based compensation expense 1,753,000 2,554,000 6,056,000 7,192,000
Nonvested Stock [Member]
       
Share-based compensation expense and income tax benefits recognized during the periods        
Share-based compensation expense $ 2,909,000 $ 2,547,000 $ 8,208,000 $ 6,994,000
Market-based restricted stock rights [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Time-vested restricted stock rights and restricted stock units granted     23,000 93,000
Number of performance periods for market-based restricted stock     P3Y  
Weighted-average fair value per restricted stock right and RSU granted     $ 53.47 $ 43.39
Market Based Restricted Stock Rights, 2012 Grant [Member] | Minimum [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage 25.00%      
Market Based Restricted Stock Rights, 2012 Grant [Member] | Maximum [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage 125.00%      
Market Based Restricted Stock Rights, Segment 1 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Segment Performance Period     1 year  
Market Based Restricted Stock Rights, Segment 2 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Segment Performance Period     2 years  
Market Based Restricted Stock Rights, Segment 3 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Segment Performance Period     3 years  
Time Vested Restricted Stock [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based compensation plan, Vesting period (in years)     3 years  
Time-vested restricted stock rights and restricted stock units granted     153,000 124,000
Weighted-average fair value per restricted stock right and RSU granted     $ 58.17 $ 52.44
Market Based Restricted Stock Rights, 2013 Grant [Member] | Minimum [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage 25.00%      
Market Based Restricted Stock Rights, 2013 Grant [Member] | Maximum [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Potential Performance Award Percentage 125.00%      
Performance based restricted stock [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Time-vested restricted stock rights and restricted stock units granted     16,000  
Stock Option [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based compensation plan, Vesting period (in years)     3 years