Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Narrative) (Details)

v3.7.0.1
Subsequent Events (Narrative) (Details)
shares in Millions
 1 Months Ended 3 Months Ended
Mar. 31, 2017
MMBTU / d
$ / MMBTU
shares
Jun. 30, 2017
shares
Apr. 30, 2017
MMBTU / d
$ / MMBTU
Dec. 31, 2014
2018        
Subsequent Event [Line Items]        
Daily Volume | MMBTU / d 30,000      
Weighted average price (in usd per MMB/Bblstu) | $ / MMBTU 3.36      
NYMEX Henry Hub | 2018        
Subsequent Event [Line Items]        
Daily Volume | MMBTU / d 543,767      
Weighted average price (in usd per MMB/Bblstu) | $ / MMBTU 3.09      
NYMEX Henry Hub | 2019        
Subsequent Event [Line Items]        
Daily Volume | MMBTU / d 9,863      
Weighted average price (in usd per MMB/Bblstu) | $ / MMBTU 3.27      
Mammoth Energy Services LP        
Subsequent Event [Line Items]        
Equity method investment, ownership interest, percent 24.20%     30.50%
Mammoth Energy Partners LP | Sturgeon Acquisitions LLC, Stingray Energy, and Stingray Cementing        
Subsequent Event [Line Items]        
Shares potentially to be sold (in shares) | shares 7.0      
Subsequent event | NYMEX Henry Hub | 2018        
Subsequent Event [Line Items]        
Daily Volume | MMBTU / d     65,000  
Weighted average price (in usd per MMB/Bblstu) | $ / MMBTU     3.03  
Subsequent event | NYMEX Henry Hub | 2019        
Subsequent Event [Line Items]        
Daily Volume | MMBTU / d     10,000  
Weighted average price (in usd per MMB/Bblstu) | $ / MMBTU     3.01  
Forecast | Mammoth Energy Services LP        
Subsequent Event [Line Items]        
Shares received from equity method investee in exchange for ownership interest (in shares) | shares   2.0    
Equity method investment, ownership interest, percent   25.10%