Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Key Terms of Credit Agreement (Details)

v3.8.0.1
Long-Term Debt - Key Terms of Credit Agreement (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 28, 2018
Mar. 02, 2018
Dec. 31, 2017
May 05, 2017
Long-Term Debt          
Amount outstanding $ 250,691        
Term Loan Facility          
Long-Term Debt          
Amount outstanding 240,625        
Equipment Notes          
Long-Term Debt          
Principal amount of debt     $ 10,100    
Amount outstanding 10,066        
Revolving Facility          
Long-Term Debt          
Availability 250,000     $ 250,000  
Amended Credit Agreement          
Long-Term Debt          
Maximum amount of senior notes that may be issued under the credit agreement   $ 500,000      
Additional term loan and/or revolver capacity available under incremental facility $ 200,000        
Amended Credit Agreement | Minimum          
Long-Term Debt          
Commitment fee (as a percent) 0.15%        
Amended Credit Agreement | Maximum          
Long-Term Debt          
Commitment fee (as a percent) 0.275%        
Amended Credit Agreement | Term Loan Facility          
Long-Term Debt          
Availability $ 250,000        
Additional term loan capacity under delayed draw feature 100,000        
Line of Credit Facility Maximum Borrowing Capacity Including Delayed Draw 350,000        
Amount outstanding         $ 250,000
Amended Credit Agreement | Revolving Facility          
Long-Term Debt          
Availability 250,000        
Sublimit for issuance of letters of credit under Revolving Facility* 100,000        
Sublimit for swingline loans under Revolving Facility* $ 20,000        
Interest rate 2.90%        
Amended Credit Agreement | Base Rate Borrowings | Minimum          
Long-Term Debt          
Applicable margin based on total leverage ratio 0.00%        
Amended Credit Agreement | Base Rate Borrowings | Maximum          
Long-Term Debt          
Applicable margin based on total leverage ratio 1.50%        
Amended Credit Agreement | LIBOR Rate Borrowings | Minimum          
Long-Term Debt          
Applicable margin based on total leverage ratio 1.00%        
Amended Credit Agreement | LIBOR Rate Borrowings | Maximum          
Long-Term Debt          
Applicable margin based on total leverage ratio 2.50%        
Federal Funds Rate | Amended Credit Agreement | Base Rate Borrowings          
Long-Term Debt          
Basis spread 0.50%        
LIBOR | Amended Credit Agreement | Base Rate Borrowings          
Long-Term Debt          
Basis spread 1.00%        
Maturity of the reference rate 1 month