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Long-Term Debt (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
May 19, 2016
USD ($)
Line of Credit Facility [Line Items]        
Letters of credit outstanding $ 0      
Amortization of debt issuance costs 131 $ 128    
Unamortized debt issue costs 1,100   $ 1,200  
Credit Agreement        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity 249,300      
Credit agreement available 16,000      
Sub-limit which may be used for issuance of letters of credit $ 15,000      
Borrowing base amount       $ 200,000
Commitment fee on unutilized borrowing base 0.50%      
Credit agreement, outstanding $ 184,000      
Credit Agreement | Scenario One        
Line of Credit Facility [Line Items]        
Debt to Adjusted EBITDA ratio 5.0      
Credit Agreement | Second full quarter after Catarina acquisition        
Line of Credit Facility [Line Items]        
Debt to Adjusted EBITDA ratio 4.75      
Credit Agreement | Thereafter        
Line of Credit Facility [Line Items]        
Debt to Adjusted EBITDA ratio 4.5      
Credit Facility Maturing March 31, 2020        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 500,000      
lender loan        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 200,000      
Minimum | Credit Agreement        
Line of Credit Facility [Line Items]        
Consolidated current asset ratio 1.0      
Required interest coverage ratio 2.5      
Distribution limitation, credit facility excess over borrowing base (as a percent) 90.00%      
Ownership percentage by subsidiary 50      
Minimum | Credit Agreement | Scenario One        
Line of Credit Facility [Line Items]        
Debt to Adjusted EBITDA ratio 4.5      
Minimum | Credit Agreement | Scenario Two        
Line of Credit Facility [Line Items]        
Debt to Adjusted EBITDA ratio 4.0      
Minimum | Credit Agreement | London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Variable interest rate 2.25%      
Minimum | Credit Agreement | ABR        
Line of Credit Facility [Line Items]        
Variable interest rate 1.25%      
Maximum | Credit Agreement | London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Variable interest rate 3.25%      
Maximum | Credit Agreement | ABR        
Line of Credit Facility [Line Items]        
Variable interest rate 2.25%