Annual report pursuant to Section 13 and 15(d)

Borrowings (Details 3)

v3.10.0.1
Borrowings (Details 3)
Jun. 30, 2016
USD ($)
Dec. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 13, 2017
Additional disclosure        
Loan origination costs   $ 1,700,000 $ 2,400,000  
New Credit Facility        
Additional disclosure        
Maximum borrowing capacity $ 20,000,000      
Additional borrowing capacity subject to lender participation 100,000,000      
New Credit Facility | Other assets, net        
Additional disclosure        
Loan origination costs 1,100,000      
New Credit Facility | Revolving credit facility        
Additional disclosure        
Maximum borrowing capacity $ 400,000,000      
Amounts outstanding   $ 192,500,000    
New Credit Facility | Revolving credit facility | Federal Funds Rate        
Additional disclosure        
Interest rate margin (as a percent) 0.50%      
New Credit Facility | Revolving credit facility | LIBOR        
Additional disclosure        
Interest rate margin (as a percent) 1.00%      
New Credit Facility | Revolving credit facility | Canadian Dealer Offered Rate (CDOR)        
Additional disclosure        
Interest rate margin (as a percent) 1.00%      
Revolving credit facility | New Credit Facility        
Additional disclosure        
Lease adjusted leverage ratio threshold       4.75
Revolving credit facility | Through October 1, 2017 | New Credit Facility        
Additional disclosure        
Lease adjusted leverage ratio       5.25
Revolving credit facility | October 2, 2017 Through July 15, 2018 | New Credit Facility        
Additional disclosure        
Lease adjusted leverage ratio       5.0
Revolving credit facility | July 16, 2018 And Thereafter | New Credit Facility        
Additional disclosure        
Lease adjusted leverage ratio       4.75