Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Long-Term Debt - Key Terms of Credit Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 01, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 28, 2018
May 05, 2017
Long-Term Debt          
Amount outstanding   $ 746,354      
Term Loan Facility          
Long-Term Debt          
Amount outstanding   323,125      
Senior Notes 5.625%          
Long-Term Debt          
Amount outstanding   400,000      
Equipment Notes          
Long-Term Debt          
Amount outstanding   $ 23,229      
Equipment notes issued     $ 26,600    
Equipment Notes | Minimum          
Long-Term Debt          
Interest rate   3.90%      
Equipment Notes | Maximum          
Long-Term Debt          
Interest rate   4.40%      
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          
Proceeds from delayed-draw term loan $ 100,000        
Availability   $ 250,000      
Additional delayed draw term loan   100,000   $ 100,000  
Maximum borrowing capacity including delayed draw feature   $ 350,000      
Amount outstanding         $ 250,000
Amended Credit Agreement | Senior Notes 5.625%          
Long-Term Debt          
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      
Sublimit for issuance of letters of credit under Revolving Facility*   100,000      
Sublimit for swingline loans under Revolving Facility*   $ 20,000      
Interest rate   3.74%      
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