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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
May 09, 2018
Dec. 22, 2017
Jun. 30, 2017
Mar. 30, 2018
Mar. 31, 2017
May 03, 2018
Equity, Class of Treasury Stock [Line Items]            
Amount available under repurchase plan       $ 2,200,000    
Shares repurchased for employee net vesting obligations, shares       175 174  
Shares repurchased for employee net vesting obligations, value       $ 3,000,000 $ 2,900,000  
Annual cash dividend per share   $ 0.30 $ 0.26      
Dividend payment   $ 4,700,000 $ 4,600,000      
Dividend declared         $ 0.34  
Subsequent Event [Member]            
Equity, Class of Treasury Stock [Line Items]            
Amount available under repurchase plan           $ 142,200,000
Additional repurchase under plan $ 5,000,000          
Dividend declared $ 0.17          
Dividend declared, date of record Jun. 29, 2018          
Dividend declared, date of payment Jul. 11, 2018          
Share Repurchase Plan [Member]            
Equity, Class of Treasury Stock [Line Items]            
Repurchase of common stock       53 59  
Purchase price per share       $ 18.33 $ 20.13  
Total cost       $ 1,000,000 $ 1,200  
Stock Appreciation Rights (SARs) [Member]            
Equity, Class of Treasury Stock [Line Items]            
SARs outstanding       2,900    
Exercise price       $ 4.00    
Expiration date       Feb. 28, 2022