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Long-Term Debt Senior Secured Second Lien Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 23, 2017
Oct. 01, 2017
Jun. 28, 2015
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument, Redemption [Line Items]          
Carrols Restaurant Group Senior Secured Second Lien Notes       $ 275,000 $ 275,000
Senior Secured Second Lien Notes, Interest Rate       8.00%  
Proceeds from Issuance of Debt $ 35,500 $ 75,000 $ 200,000    
Repayments of Debt 42,600        
Debt Issuance Costs, Net $ 1,800     $ 3,948 $ 4,770
Collateral exclusion for material subsidiaries, percentage of Senior Notes       20.00%  
Senior Notes, Cross Default Provision, Minimum Debt Principal Amount       $ 20,000  
Debt Instrument, Redemption, Period Two [Member]          
Debt Instrument, Redemption [Line Items]          
Senior Notes, Redemption Price       104.00%  
Debt Instrument, Redemption, Period Three [Member]          
Debt Instrument, Redemption [Line Items]          
Senior Notes, Redemption Price       102.00%  
Debt Instrument, Redemption, Period Four [Member]          
Debt Instrument, Redemption [Line Items]          
Senior Notes, Redemption Price       100.00%