Quarterly report pursuant to Section 13 or 15(d)

Leases (Lease Cost on Consolidated Statement of Operations) (Details)

v3.21.1
Leases (Lease Cost on Consolidated Statement of Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease Costs [Line Items]    
Total lease expense $ 6,618 $ 9,327
Lease costs capitalized   1,102
Total lease costs 6,618 10,429
Production Expense [Member]    
Lease Costs [Line Items]    
Total lease expense 2,649 2,205
General and Administrative Expense [Member]    
Lease Costs [Line Items]    
Total lease expense 49 49
Lease Costs Billed To Joint Venture Owners [Member]    
Lease Costs [Line Items]    
Total lease expense $ 3,920 $ 7,073