Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.19.3.a.u2
Subsequent Events (Details)
MMBTU in Thousands, $ in Millions
2 Months Ended
Jan. 02, 2020
USD ($)
Feb. 27, 2020
MMBTU
$ / MMBTU
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Event [Line Items]        
Repurchased face amount       $ 200.0
Subsequent Event        
Subsequent Event [Line Items]        
Proceeds from sale of assets $ 50.0      
Incentive payments, term 15 years      
Senior notes | Subsequent Event        
Subsequent Event [Line Items]        
Repurchased face amount     $ 10.2  
Debt instrument, repurchase amount     $ 6.9  
Early Termination, Fixed Price Swaps | Subsequent Event        
Subsequent Event [Line Items]        
Daily Volume (MMBtu/day) | MMBTU   294    
Fixed Price Swap 2020 April, May | Subsequent Event        
Subsequent Event [Line Items]        
Daily Volume (MMBtu/day) | MMBTU   472    
Early terminations, weighted average price | $ / MMBTU   2.85