| Stock-Based Compensation (Tables)
 | 12 Months Ended | 
      
        | Dec. 31, 2014 | 
      
        | Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  | 
      
        | Schedule of Stock-Based Compensation Expense | 
Stock-based compensation expense consisted of the following (in thousands):  
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   | Year Ended December 31, |  
|   |   | 2014 |   | 2013 |   | 2012 |  
| Cost of sales |   | $ | 399 | 
 |   | $ | 347 | 
 |   | $ | 287 | 
 |  
| SG&A expense |   | 10,721 | 
 |   | 8,531 | 
 |   | 7,546 | 
 |  
| Pre-tax stock-based compensation expense |   | 11,120 | 
 |   | 8,878 | 
 |   | 7,833 | 
 |  
| Income tax benefits |   | (3,874 | ) |   | (3,102 | ) |   | (2,724 | ) |  
| Total stock-based compensation expense, net of tax |   | $ | 7,246 | 
 |   | $ | 5,776 | 
 |   | $ | 5,109 | 
 |  | 
      
        | Schedule of Weighted Average Assumptions | 
The following table presents the weighted average assumptions for the years ended December 31: 
|  |  
|  |  |  |  |  |  |  |  
|   |   | 2014 |   | 2013 |   | 2012 |  
| Expected term |   | 4.69 years |   | 4.70 years |   | 4.78 years |  
| Expected stock price volatility |   | 27.62% |   | 30.53% |   | 32.20% |  
| Risk-free interest rate |   | 1.22% |   | 0.71% |   | 0.88% |  
| Expected dividend yield |   | 1.34% |   | 1.62% |   | 1.80% |  
| Weighted average grant date fair value |   | $8.69 |   | $6.18 |   | $5.79 | 
 | 
      
        | Summary of Stock Option Activity | 
The following table summarizes stock option activity under the Plan: 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   | 
Number of  Shares
 |   | 
 Weighted Average
 Exercise
 Price
 |   | Weighted Average Remaining Contractual Life |   | Aggregate Intrinsic Value (in thousands) |  
| Options outstanding at January 1, 2012 |   | 3,838,192 | 
 |   | $ | 23.02 | 
 |   | 6.25 |   | $ | 9,141 | 
 |  
| Granted |   | 716,338 | 
 |   | 24.41 | 
 |   |   |   |   |  
| Cancelled |   | (344,930 | ) |   | 26.45 | 
 |   |   |   |   |  
| Exercised |   | (761,622 | ) |   | 19.17 | 
 |   |   |   |   |  
| Options outstanding at December 31, 2012 |   | 3,447,978 | 
 |   | 23.82 | 
 |   | 6.15 |   | 13,001 | 
 |  
| Granted |   | 708,220 | 
 |   | 27.33 | 
 |   |   |   |   |  
| Cancelled |   | (119,098 | ) |   | 26.67 | 
 |   |   |   |   |  
| Exercised |   | (888,836 | ) |   | 21.98 | 
 |   |   |   |   |  
| Options outstanding at December 31, 2013 |   | 3,148,264 | 
 |   | 25.02 | 
 |   | 6.36 |   | 45,187 | 
 |  
| Granted |   | 512,761 | 
 |   | 39.69 | 
 |   |   |   |   |  
| Cancelled |   | (102,598 | ) |   | 28.39 | 
 |   |   |   |   |  
| Exercised |   | (917,642 | ) |   | 24.28 | 
 |   |   |   |   |  
| Options outstanding at December 31, 2014 |   | 2,640,785 | 
 |   | $ | 28.00 | 
 |   | 6.50 |   | $ | 43,682 | 
 |  
| Options vested and expected to vest at December 31, 2014 |   | 2,548,918 | 
 |   | $ | 27.80 | 
 |   | 6.42 |   | $ | 42,677 | 
 |  
| Options exercisable at December 31, 2014 |   | 1,290,374 | 
 |   | $ | 24.15 | 
 |   | 4.78 |   | $ | 26,315 | 
 |  | 
      
        | Schedule Of Weighted Average Assumptions for Restricted Stock Units | 
The following table presents the weighted average assumptions for the years ended December 31: 
|  |  
|  |  |  |  |  |  |  |  
|   |   | 2014 |   | 2013 |   | 2012 |  
| Vesting period |   | 3.83 years |   | 3.84 years |   | 3.86 years |  
| Expected dividend yield |   | 1.33% |   | 1.58% |   | 1.77% |  
| Estimated average fair value per restricted stock unit granted |   | $38.98 |   | $26.67 |   | $23.29 |  | 
      
        | Summary of Restricted Stock Unit Activity | 
The following table summarizes the restricted stock unit activity under the Plan: 
|  |  
|  |  |  |  |  |  |  |  |  
|   |   | 
Number of  Shares
 |   | 
Weighted Average  Grant Date Fair Value Per Share
 |  
| Restricted stock units outstanding at January 1, 2012 |   | 593,504 | 
 |   | $ | 23.60 | 
 |  
| Granted |   | 370,606 | 
 |   | 23.29 | 
 |  
| Vested |   | (182,766 | ) |   | 21.20 | 
 |  
| Forfeited |   | (140,228 | ) |   | 23.13 | 
 |  
| Restricted stock units outstanding at December 31, 2012 |   | 641,116 | 
 |   | 24.16 | 
 |  
| Granted |   | 322,474 | 
 |   | 26.67 | 
 |  
| Vested |   | (232,714 | ) |   | 23.04 | 
 |  
| Forfeited |   | (56,382 | ) |   | 24.95 | 
 |  
| Restricted stock units outstanding at December 31, 2013 |   | 674,494 | 
 |   | 25.67 | 
 |  
| Granted |   | 272,642 | 
 |   | 38.98 | 
 |  
| Vested |   | (220,348 | ) |   | 25.21 | 
 |  
| Forfeited |   | (68,028 | ) |   | 28.51 | 
 |  
| Restricted stock units outstanding at December 31, 2014 |   | 658,760 | 
 |   | $ | 31.03 | 
 |  |