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Stockholders' Equity - Stock Repurchase Program and Cash Dividends (Details)
3 Months Ended
Feb. 13, 2018
$ / shares
Dec. 12, 2017
$ / shares
Sep. 12, 2017
$ / shares
Jun. 13, 2017
$ / shares
Mar. 14, 2017
$ / shares
Dec. 13, 2016
$ / shares
Sep. 13, 2016
$ / shares
Jun. 14, 2016
$ / shares
Mar. 15, 2016
$ / shares
Oct. 28, 2017
USD ($)
shares
Jul. 29, 2017
USD ($)
shares
Mar. 16, 2018
USD ($)
Feb. 03, 2018
USD ($)
item
Apr. 10, 2017
USD ($)
Jan. 28, 2017
item
Stockholders' Equity                              
Stock Repurchase Program, Authorized Amount                       $ 25,000,000      
Aggregate value of stock repurchases that cause program to expire                   $ 25,000,000 $ 25,000,000        
Cash dividends declared per share | $ / shares $ 0.08                            
Number of quarters dividends paid | item                         4   4
Cash dividend paid per share | $ / shares   $ 0.08 $ 0.08 $ 0.08 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06            
Stock Repurchase Program                              
Stockholders' Equity                              
Stock Repurchased During Period Shares | shares                   1,201,000 1,201,000        
Additional shares which could be repurchased                         $ 0    
Stock Repurchase Program | Maximum                              
Stockholders' Equity                              
Stock Repurchase Program, Authorized Amount                           $ 25,000