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Stock Plans and Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares/Rights      
Granted (in shares) 73,716 109,750 186,982
Stock Options And Stock Appreciation Rights      
Number of Shares/Rights      
Outstanding, December 31, 2016 (in shares) 441,016    
Granted (in shares) 19,946    
Exercised (in shares) (107,528)    
Forfeited (in shares) (14,918)    
Outstanding, December 31, 2016 (in shares) 338,516 441,016  
Exercisable, December 31, 2016 (in shares) 155,046    
Weighted Average Exercise Price      
Outstanding, December 31, 2016 (in USD per share) $ 42.46    
Granted (in USD per share) 77.00    
Exercised (in USD per share) 38.77    
Forfeited (in USD per share) 45.00    
Outstanding, December 31, 2016 (in USD per share) 45.56 $ 42.46  
Exercisable, December 31, 2016 (in USD per share) $ 39.43    
Weighted Average Remaining Contractual Term      
Outstanding, December 31, 2016 (in years) 5 years 6 months 22 days    
Exercisable, December 31, 2016 (in years) 3 years 2 months 1 day    
Aggregate Intrinsic Value      
December 31, 2016 $ 16,582,002    
December 31, 2016 $ 8,544,305