Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Long-Term Debt - Key Terms of Credit Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 01, 2018
Apr. 25, 2018
Sep. 30, 2018
Sep. 30, 2018
Mar. 28, 2018
Dec. 31, 2017
May 05, 2017
Long-Term Debt              
Proceeds from issuance of senior notes       $ 400,000      
Amount outstanding     $ 750,757 750,757      
Equipment notes issued       20,104      
Term Loan Facility              
Long-Term Debt              
Amount outstanding     331,875 331,875      
Senior Notes 5.625%              
Long-Term Debt              
Amount outstanding     400,000 400,000      
Equipment Notes              
Long-Term Debt              
Amount outstanding     18,882 18,882      
Equipment notes issued     5,038 20,104      
Revolving Facility              
Long-Term Debt              
Availability     250,000 $ 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    
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              
Proceeds from delayed-draw term loan $ 100,000            
Availability     250,000 $ 250,000      
Additional delayed draw term loan     100,000 100,000      
Additional term loan and/or revolver capacity available under incremental facility     200,000 200,000      
Maximum borrowing capacity including delayed draw feature     350,000 350,000      
Amount outstanding             $ 250,000
Amended Credit Agreement | Senior Notes 5.625%              
Long-Term Debt              
Proceeds from issuance of senior notes   $ 400,000          
Interest rate   5.625%          
Amended Credit Agreement | Senior Notes 5.625% | Change in Control Scenario              
Long-Term Debt              
Redemption price as a percentage of principal   101.00%          
Amended Credit Agreement | Revolving Facility              
Long-Term Debt              
Availability     250,000 250,000      
Sublimit for issuance of letters of credit under Revolving Facility*     100,000 100,000      
Sublimit for swingline loans under Revolving Facility*     $ 20,000 $ 20,000      
Interest rate     3.33% 3.33%      
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