Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (unaudited) (Details)

v3.8.0.1
Quarterly Results of Operations (unaudited) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
restaurant
$ / shares
Oct. 01, 2017
USD ($)
$ / shares
Jul. 09, 2017
USD ($)
restaurant
$ / shares
Dec. 25, 2016
USD ($)
restaurant
$ / shares
Oct. 02, 2016
USD ($)
restaurant
$ / shares
Jul. 10, 2016
USD ($)
restaurant
$ / shares
Apr. 16, 2017
USD ($)
$ / shares
Apr. 17, 2016
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
restaurant
$ / shares
Dec. 25, 2016
USD ($)
restaurant
$ / shares
Dec. 27, 2015
USD ($)
restaurant
$ / shares
Dec. 28, 2014
Dec. 29, 2013
Quarterly Financial Information Disclosure [Abstract]                          
Total revenues $ 342,353 $ 304,248 $ 315,771 $ 291,459 $ 297,307 $ 305,549 $ 418,557 $ 402,126 $ 1,380,929 $ 1,296,441 $ 1,257,592    
Income (loss) from operations 8,152 4,056 9,366 (14,785) (4,235) 10,415 17,458 20,175 39,032 11,570 $ 67,045    
Net income (loss) $ 8,807 $ 2,714 $ 6,931 $ (8,752) $ (1,300) $ 7,552 $ 11,567 $ 14,225 $ 30,019 $ 11,725      
Basic earning (loss) per share (in dollars per share) | $ / shares $ 0.68 $ 0.21 $ 0.54 $ (0.68) $ (0.10) $ 0.56 $ 0.90 $ 1.04 $ 2.33 $ 0.88 $ 3.40    
Diluted earning (loss) per share (in dollars per share) | $ / shares $ 0.68 $ 0.21 $ 0.53 $ (0.68) $ (0.10) $ 0.55 $ 0.89 $ 1.03 $ 2.31 $ 0.87 $ 3.36    
Number of restaurants impaired | restaurant 8   5 16 2 6     13 19 2    
Pre-tax non-cash impairment charge $ 5,300   $ 1,600 $ 19,300 $ 3,800 $ 3,900   $ 800 $ 6,914 $ 31,842 $ 581    
Restaurant closure costs       $ 1,200 $ 5,500         $ 6,700      
Number of restaurants closed | restaurant 1     9 9       1 9      
Number of previously impaired restaurants | restaurant       5                  
Duration of fiscal period 91 days 84 days 84 days 84 days 84 days 84 days 112 days 112 days 371 days 364 days 364 days 364 days 364 days