Quarterly report pursuant to Section 13 or 15(d)

Debt Instruments - Credit Facility (Details)

v3.8.0.1
Debt Instruments - Credit Facility (Details) - USD ($)
Mar. 31, 2018
Dec. 29, 2017
Line of credit    
Debt Instruments    
Maximum borrowings available   $ 200,000,000.0
Outstanding borrowings $ 0  
Available borrowing capacity 156,300,000  
Letter of credit    
Debt Instruments    
Line of Credit Facility, Option To Increase Maximum Borrowing Capacity   $ 50,000,000.0
Outstanding amount $ 1,200,000