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Share-Based Compensation Plans (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based compensation expense and income tax benefits recognized during the periods        
Share-based compensation expense $ 4,992,000 $ 4,648,000 $ 9,602,000 $ 9,085,000
Income tax benefit (1,640,000) (1,522,000) (3,327,000) (3,006,000)
Share-based compensation expense, net of tax 3,352,000 3,126,000 6,275,000 6,079,000
Summary of compensation expense recognized related to cash awards        
Cash awards 889,000 788,000 2,163,000 1,385,000
Share Based Compensation Plans (Textuals) [Abstract]        
Stock option plan granted     381,000 460,000
Weighted-average fair value per option granted     $ 13.99 $ 14.07
Awards issued but not granted     30,000  
Total unrecognized pre-tax compensation expense 32,200,000   32,200,000  
Unrecognized Compensation Costs weighted-average period (in years)     1 year 9 months 18 days  
2013 stock opton grants [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Stock option plan granted, contractual term (in years)     10 years  
2012 stock opton 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 2,193,000 2,274,000 4,303,000 4,638,000
Nonvested Stock [Member]
       
Share-based compensation expense and income tax benefits recognized during the periods        
Share-based compensation expense $ 2,799,000 $ 2,374,000 $ 5,299,000 $ 4,447,000
Market-based restricted stock rights [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Performance-based restricted stock rights and restricted stock units granted     22,000 93,000
Number of performance periods for market-based restricted stock     three  
Weighted-average fair value per restricted stock right and RSU granted     $ 53.32 $ 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  
Performance-based restricted stock rights and restricted stock units granted     146,000 123,000
Weighted-average fair value per restricted stock right and RSU granted     $ 58.06 $ 52.64
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]        
Performance-based restricted stock rights and restricted stock units granted     15,000  
Stock Option [Member]
       
Share Based Compensation Plans (Textuals) [Abstract]        
Share-based compensation plan, Vesting period (in years)     3 years