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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 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impairment losses $ 1,548 $ 1,330 $ 6,962 $ 8,322
Assets held for sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets held for sale, impairment 100 61 315 111
Operating lease right-of-use assets [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Operating lease assets, impairment 622 0 2,988 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 300   300  
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 2,400   2,400  
Property, fixtures and equipment, net [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Property, fixtures and equipment, impairment 826 1,269 3,659 8,211
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 400   400  
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 1,300   1,300  
Carrying 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 1,588   1,588  
Carrying 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 6,049   6,049  
Carrying 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   4,025   4,025
Carrying 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   5,455   5,455
Carrying value measurement [Member] | Assets held for sale [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] 900 2,030 900 2,030
Carrying 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] 2,049 2,080 2,049 2,080
Carrying 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] 293   293  
Carrying 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] 2,649   2,649  
Carrying 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   0   0
Carrying 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   0   0
Carrying 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] 395   395  
Carrying 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] $ 1,351   $ 1,351  
Carrying 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 [1]   1,995   1,995
Carrying 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]   $ 3,375   $ 3,375
[1]
Carrying value after impairment approximates fair value with all assets measured using third-party market appraisals or executed sales contracts (Level 2).
[2]
Carrying value after impairment 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 $0.3 million and $0.4 million, respectively, during the thirteen weeks ended September 29, 2019 and $2.4 million and $1.3 million, respectively, during the thirty-nine weeks ended September 29, 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.