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Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Apr. 13, 2018
Mar. 31, 2018
Dec. 30, 2017
Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 750,000,000   $ 335,000,000  
Letters of credit 30,000,000      
Long-term line of credit facility 449,600,000     $ 182,700,000
Line of credit facility, remaining borrowing capacity $ 133,600,000     $ 63,300,000
Line of credit facility, interest rate at period end 4.10%     4.20%
Minimum remaining borrowing capacity before fixed covered ratio is applicable $ 50,000,000      
Minimum percentage of borrowing base and maximum borrowing capacity to apply fixed charge coverage ratio 10.00%      
Interest coverage ratio, minimum 1.0      
Cedar Creek | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 600,000,000.0    
Line of credit facility, additional borrowing capacity under uncommitted accordion feature   $ 150,000,000.0    
LIBOR | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Variable rate basis LIBOR      
LIBOR | Minimum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread 1.75%      
LIBOR | Maximum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread 2.25%      
Base Rate | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Variable rate basis agent’s base rate      
Base Rate | Minimum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread 0.75%      
Base Rate | Maximum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread 1.25%      
Term Loan | Secured Debt        
Debt Instrument [Line Items]        
Long-term line of credit facility $ 180,000,000.0      
Quarterly term loan principal payments 450,000      
Long-term debt, gross $ 179,600,000      
Stated interest rate 9.09%      
Term Loan | Minimum | Secured Debt        
Debt Instrument [Line Items]        
Net leverage ratio 1.00      
Term Loan | Maximum | Secured Debt        
Debt Instrument [Line Items]        
Net leverage ratio 8.25      
Term Loan | LIBOR | Secured Debt        
Debt Instrument [Line Items]        
Variable rate basis LIBOR      
Term Loan | LIBOR | Minimum | Secured Debt        
Debt Instrument [Line Items]        
Basis spread 1.00%      
Term Loan | LIBOR | Maximum | Secured Debt        
Debt Instrument [Line Items]        
Basis spread 7.00%      
Term Loan | Base Rate | Secured Debt        
Debt Instrument [Line Items]        
Variable rate basis agent’s base rate      
Term Loan | Base Rate | Minimum | Secured Debt        
Debt Instrument [Line Items]        
Basis spread 2.00%      
Term Loan | Base Rate | Maximum | Secured Debt        
Debt Instrument [Line Items]        
Basis spread 6.00%