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Fair Value Measurements (Fair value measurements on a nonrecurring basis) (Details) - Fair value, measurements, nonrecurring [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impairment losses $ 1,932 $ 4,721 $ 5,414 $ 6,992
Assets held for sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held for sale, impairment     215 50
Operating lease right-of-use assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Operating lease assets, impairment 1,770 0 2,366 0
Operating lease right-of-use assets [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 200   200  
Operating lease right-of-use assets [Member] | Fair value, inputs, level 3 [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 100   100  
Operating lease right-of-use assets [Member] | Fair value, inputs, level 3 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 2,100   2,100  
Property, fixtures and equipment, net [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Property, fixtures and equipment, impairment 162 4,721 2,833 6,942
Property, fixtures and equipment, net [Member] | Fair value, inputs, level 3 [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 500   500  
Property, fixtures and equipment, net [Member] | Fair value, inputs, level 3 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 1,000   1,000  
Reported value measurement [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 580   580  
Reported value measurement [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure 5,461   5,461  
Reported value measurement [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [1]   1,060   1,060
Reported value measurement [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [1]   1,430   1,430
Reported value measurement [Member] | Assets held for sale [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [1] 2,149 50 2,149 50
Reported value measurement [Member] | Operating lease right-of-use assets [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [2] 114   114  
Reported value measurement [Member] | Operating lease right-of-use assets [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [2] 2,356   2,356  
Reported value measurement [Member] | Operating lease right-of-use assets [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [2]   0   0
Reported value measurement [Member] | Operating lease right-of-use assets [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [1]   0   0
Reported value measurement [Member] | Property, fixtures and equipment, net [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [2] 466   466  
Reported value measurement [Member] | Property, fixtures and equipment, net [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [2] $ 956   $ 956  
Reported value measurement [Member] | Property, fixtures and equipment, net [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, quarter-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [2]   1,060   1,060
Reported value measurement [Member] | Property, fixtures and equipment, net [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value disclosure [1]   $ 1,380   $ 1,380
[1]
Carrying value approximates fair value with all assets measured using third-party market appraisals or executed sales contracts (Level 2).
[2]
Carrying value approximates fair value. Carrying values for Operating lease right-of-use assets and Property, fixtures and equipment measured using Level 3 inputs to estimate fair value totaled $0.1 million and $0.5 million, respectively, during the thirteen weeks ended June 30, 2019 and $2.1 million and $1.0 million, respectively, during the twenty-six weeks ended June 30, 2019. Level 2 inputs were used to estimate the fair value for all other assets measured in the periods presented. Third-party market appraisals (Level 2) and discounted cash flow models (Level 3) were used to estimate fair value.