Quarterly report pursuant to Section 13 or 15(d)

Repurchase of Common Stock (Details)

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Repurchase of Common Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended
Dec. 31, 2016
Dec. 03, 2016
Nov. 05, 2016
Dec. 31, 2016
Jan. 02, 2016
Class of Stock [Line Items]          
Authorized amount $ 40,000,000     $ 40,000,000  
Shares repurchased (in shares)       46,643 68,330
Stock repurchased during period, value       $ 800,000 $ 1,100,000
Aggregated number of shares repurchased (in shares) 2,526,793     2,526,793  
Aggregated shares repurchased, value $ 31,700,000     $ 31,700,000  
Dollar Value of Shares that May Yet Be Purchased Under the Plans $ 8,300,000     $ 8,300,000  
Common Stock          
Class of Stock [Line Items]          
Shares repurchased (in shares) 5,802 17,232 23,609 46,643  
Average Price Paid per Share(usd per share) $ 20.32 $ 19.12 $ 15.83 $ 17.60  
Dollar Value of Shares that May Yet Be Purchased Under the Plans $ 8,300,000 $ 8,400,000 $ 8,700,000 $ 8,300,000  
Publicly Announced Plan | Common Stock          
Class of Stock [Line Items]          
Shares repurchased (in shares) 5,802 17,232 23,609 46,643