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Supplemental Disclosures of Cash Flow Information (Notes)
 9 Months Ended
Sep. 30, 2019
Supplemental Cash Flow Elements [Abstract]  
Cash Flow, Supplemental Disclosures [Text Block] SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
 
 
Nine Months Ended September 30,
 
 
2019
 
2018 (1)
 
 
(in thousands)

Supplemental cash flow information:
 
 
 
 
Cash payments for:
 
 
 
 
Interest, net of capitalized interest
 
$
41,483

 
$
39,470

Income taxes
 
261

 
(6,707
)
 
 
 
 
 
Non-cash investing and financing activities:
 
 
 
 
Change in accounts payable related to capital expenditures
 
$
(57,696
)
 
$
91,444

Change in asset retirement obligations, with a corresponding change to crude oil and natural gas properties, net of disposals
 
13,493

 
6,720

Change in accounts payable related to the purchase and retirement of treasury shares
 
2,818

 
—

 
 
 
 
 
Cash paid for amounts included in the measurement of lease liabilities:
 
 
 
 
   Operating cash flows from operating leases
 
$
4,107

 
$
—

   Operating cash flows from finance leases
 
193

 
—

 
 
 
 
 
ROU assets obtained in exchange for lease obligations:
 
 
 
 
   Operating leases
 
$
1,428

 
$
—

      Finance leases
 
2,323

 
—


(1) As we have elected the modified retrospective method of adoption for the New Lease Standard, cash flows related to lease liabilities have
not been restated for the nine months ended September 30, 2018.