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Stock-Based Compensation Plans (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based Compensation Plans (Textual) [Abstract]      
Stock-based compensation cost $ 18,851 $ 16,012 $ 13,899
Income tax benefit for stock based compensation arrangements 5,300 4,400 3,700
Unrecognized compensation cost related to stock based compensation arrangements $ 46,800    
Weighted average period for recognition of cost 3 years 4 months 29 days    
Cash received from employee stock purchase plan purchases $ 7,200 6,000 5,600
Tax benefit realized for the tax deductions 2,142 1,841 3,000
Increase in financing activities and decrease in operating activities due to tax benefit relating to excess stock based compensation deductions $ 2,142 $ 1,841 $ 2,993
2014 Long Term Incentive Plan [Member]      
Stock-based Compensation Plans (Textual) [Abstract]      
Expiry date for stock options grant May 21, 2024    
Shares available for granted under the incentive plan 1,454,675    
Employee Stock Purchase Plan [Member]      
Stock-based Compensation Plans (Textual) [Abstract]      
Expiry date for stock options grant May 19, 2025    
Shares available for granted under the incentive plan 1,414,681    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,000,000    
Shares authorized under Employee stock option plan 4,500,000    
Employee stock purchase price in percentage of fair market value 85.00%    
Shares issued to employee under purchase plan 102,029 103,254 104,295
Weighted average fair value of employee stock purchase rights issued $ 18.56 $ 15.15 $ 14.37
Restricted Stock [Member]      
Stock-based Compensation Plans (Textual) [Abstract]      
Fair value of shares vested $ 13,900 $ 12,100 $ 9,800
Restricted Stock [Member] | Maximum [Member]      
Stock-based Compensation Plans (Textual) [Abstract]      
Range of forfeiture provisions 5 years