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Credit Facilities - Borrowing Base Utilization (Details)
12 Months Ended
Dec. 31, 2015
Eurodollar Margin | Borrowing Base Utilization Less Than25 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 1.50%
Eurodollar Margin | Borrowing Base Utilization Percentage Greater Than Equal To25 Percent But Less Than50 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 1.75%
Eurodollar Margin | Borrowing Base Utilization Percentage Greater Than Equal To50 Percent But Less Than75 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 2.00%
Eurodollar Margin | Borrowing Base Utilization Percentage Greater Than Equal To75 Percent But Less Than90 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 2.25%
Eurodollar Margin | Borrowing Base Utilization Range Equal To Above90 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 2.50%
Base Rate Margin | Borrowing Base Utilization Less Than25 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 0.50%
Base Rate Margin | Borrowing Base Utilization Percentage Greater Than Equal To25 Percent But Less Than50 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 0.75%
Base Rate Margin | Borrowing Base Utilization Percentage Greater Than Equal To50 Percent But Less Than75 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 1.00%
Base Rate Margin | Borrowing Base Utilization Percentage Greater Than Equal To75 Percent But Less Than90 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 1.25%
Base Rate Margin | Borrowing Base Utilization Range Equal To Above90 Percent  
Line Of Credit Facility [Line Items]  
Line of credit, interest rate 1.50%