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Debt and Other Obligations - Refinancing of Credit Agreement and Term B Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 06, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Debt and Other Obligations        
Outstanding amount of debt   $ 520,080   $ 507,201
Letters of credit outstanding amount       $ 5,200
Debt issuance costs   6,757 $ 2,863  
Debt call premium   $ 8,436    
Revolving Credit Facility        
Debt and Other Obligations        
Annual fee, as a percent of the applicable margin over LIBOR 50.00%      
Revolving Credit Facility | Minimum        
Debt and Other Obligations        
Unused commitment fee (as a percent) 0.375%      
Revolving Credit Facility | Maximum        
Debt and Other Obligations        
Unused commitment fee (as a percent) 0.50%      
Credit Agreement, dated March 6, 2018, Term Loan B        
Debt and Other Obligations        
Outstanding amount of debt $ 505,000      
Weighted average interest rate   5.60%   5.80%
Prior Credit Agreements        
Debt and Other Obligations        
Debt call premium 8,400      
Unamortized discount and debt issuance costs expensed 8,600      
Revolving Credit Facility        
Debt and Other Obligations        
Maximum borrowing capacity 605,000      
Increase in additional borrowing capacity $ 125,000      
Maximum leverage ratio to use maximum credit facility 3.80      
Proceeds from borrowing $ 501,500      
Debt issuance costs $ 6,800      
Interest rate in excess of applicable rate upon acceleration and default ( as a percent) 2.00%      
Revolving Credit Facility | LIBOR        
Debt and Other Obligations        
Interest rate margin (as a percent) 1.00%      
Revolving Credit Facility | Federal funds rate        
Debt and Other Obligations        
Interest rate margin (as a percent) 0.50%      
Revolving Credit Facility | Fiscal quarters ended December 31, 2019 and March31, 2020        
Debt and Other Obligations        
Consolidated leverage ratio 4.75%      
Revolving Credit Facility | Fiscal quarters ended June 30, 2020 through March 31, 2021        
Debt and Other Obligations        
Consolidated leverage ratio 4.50%      
Revolving Credit Facility | Fiscal quarters ended June 30, 2021 through March 31, 2022        
Debt and Other Obligations        
Consolidated leverage ratio 4.25%      
Revolving Credit Facility | Fiscal quarters ended June 30, 2022 and the last day of each fiscal quarter thereafter        
Debt and Other Obligations        
Consolidated leverage ratio 3.75%      
Revolving Credit Facility | Last day of any fiscal quarter        
Debt and Other Obligations        
Consolidated leverage ratio 2.75%      
Revolving Credit Facility | Revolving Credit Facility        
Debt and Other Obligations        
Maximum borrowing capacity $ 100,000