Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

v3.19.1
Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Feb. 05, 2019
Jul. 21, 2016
Shareholders' Equity [Line Items]              
Stock Repurchased and Retired During Period, Shares 229,872       364,286    
Stock Repurchased and Retired During Period, In Total Dollars $ 14,181       $ 19,993    
Repurchase of Common Stock, Average Cost Per Share $ 61.69       $ 54.88    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 4,837,700            
Common Stock [Member]              
Shareholders' Equity [Line Items]              
Dividends per share (in dollars per share) $ 0.18 $ 0.18 $ 0.15 $ 0.15 $ 0.15    
2016 Stock Repurchase Plan [Member]              
Shareholders' Equity [Line Items]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             3,000,000
Stock Repurchased and Retired During Period, Shares 67,572       364,286    
Stock Repurchased and Retired During Period, In Total Dollars $ 3,850       $ 19,993    
Repurchase of Common Stock, Average Cost Per Share $ 56.97       $ 54.88    
2019 Stock Repurchase Plan [Member]              
Shareholders' Equity [Line Items]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           5,000,000  
Stock Repurchased and Retired During Period, Shares 162,300            
Stock Repurchased and Retired During Period, In Total Dollars $ 10,331            
Repurchase of Common Stock, Average Cost Per Share $ 63.66