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Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The following table sets forth the Company’s property, plant and equipment:
September 30, 2020December 31, 2019
 (In thousands)
Proved oil and gas properties
$9,024,122 $8,724,376 
Less: Accumulated depreciation, depletion, amortization and impairment(8,245,798)(3,601,019)
Proved oil and gas properties, net778,324 5,123,357 
Unproved oil and gas properties342,361 738,662 
Other property and equipment
1,309,897 1,279,653 
Less: Accumulated depreciation and impairment(314,728)(163,896)
Other property and equipment, net995,169 1,115,757 
Total property, plant and equipment, net$2,115,854 $6,977,776 
Impairment
The Company reviews its long-lived assets for impairment by asset group whenever events and circumstances indicate that a decline in the recoverability of their carrying value may have occurred.
Proved oil and gas properties. As a result of the significant decline in expected future commodity prices coupled with the Company’s liquidity concerns, and the resulting decrease in its estimated proved reserves, the Company reviewed its proved oil and gas properties in both the Williston Basin and the Delaware Basin for impairment in the first quarter of 2020. During the nine months ended September 30, 2020, the Company recorded impairment charges of $4.4 billion, including $3.8 billion related to the Williston Basin and $637.3 million related to the Delaware Basin, to reduce the carrying values of its proved oil and gas properties to their estimated fair values (see Note 7 — Fair Value Measurements). The Company did not record
impairment charges on its proved oil and gas properties during the three months ended September 30, 2020 and the three and nine months ended September 30, 2019.
Unproved oil and gas properties. The Company assessed its unproved oil and gas properties for impairment and recorded impairment charges on its unproved oil and gas properties of $0.9 million and $293.0 million during the three and nine months ended September 30, 2020, respectively, and $0.7 million during the nine months ended September 30, 2019 as a result of leases expiring or expected to expire as well as drilling plan uncertainty on certain acreage of unproved properties. During the three months ended September 30, 2019, the Company did not record impairment charges on its unproved oil and gas properties.
Other property and equipment. Due to the significant decline in expected future commodity prices during the first quarter of 2020, the Company and other crude oil and natural gas producers changed their development plans, which resulted in lower forecasted throughput volumes for the Company’s midstream assets. As a result, the Company reviewed its midstream assets, grouped by commodity for each basin, for impairment as of March 31, 2020. The carrying amounts exceeded the estimated undiscounted future cash flows for certain midstream asset groups in the Williston Basin and the Delaware Basin, and as a result, the Company recorded impairment charges of $108.3 million during the nine months ended September 30, 2020 to reduce the carrying values of these midstream assets to their estimated fair values. In addition, during the three and nine months ended September 30, 2020, the Company recorded impairment charges of $1.1 million and $1.6 million, respectively, on certain midstream equipment, including a right-of-use asset associated with mechanical refrigeration units leased at the Company’s natural gas processing complex in the Williston Basin. No impairment charges were recorded on the Company’s midstream assets during the three and nine months ended September 30, 2019.