Impairment of Assets	9 Months Ended
Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment of Assets	4. Impairment of Assets 2020 Evaluation. For the third quarter ended September 30, 2020, we evaluated three of our drilling rigs with indicators of impairment. Based on our assumptions and analysis at that time, we determined that the undiscounted probability-weighted cash flow for each rig was in excess of its respective carrying value. As a result, we concluded that no impairment of these rigs had occurred at September 30, 2020. As discussed in Note 2, during the first quarter of 2020, the business climate in which we operate experienced a significant adverse change, which resulted in a dramatic decline in oil prices. During the first quarter of 2020, we evaluated five of our drilling rigs that had indicators of impairment. Based on our assumptions and analysis at that time, we determined that the carrying value of four of these rigs was impaired (we collectively refer to these four rigs as the 2020 Impaired Rigs). We estimated the fair values of the 2020 Impaired Rigs using an income approach, whereby the fair value of each rig was estimated based on a calculation of the rig’s future net cash flows. These calculations utilized significant unobservable inputs, including management’s assumptions related to estimated dayrate revenue, rig utilization, estimated capital expenditures, repair and regulatory survey costs, as well as estimated proceeds that may be received on ultimate disposition of each rig. Our fair value estimates were representative of Level 3 fair value measurements due to the significant level of estimation involved and the lack of transparency as to the inputs used. We recorded aggregate impairments of $774.0 million for the nine months ended September 30, 2020 related to our 2020 Impaired Rigs. See Note 7. We evaluate our property and equipment for impairment whenever changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If market fundamentals in the offshore oil and gas industry deteriorate further or a market recovery is further delayed, we may be required to recognize additional impairment charges in future periods.

Impairment of Assets

9 Months Ended

Sep. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

4. Impairment of Assets

2020 Evaluation. For the third quarter ended September 30, 2020, we evaluated three of our drilling rigs with indicators of impairment. Based on our assumptions and analysis at that time, we determined that the undiscounted probability-weighted cash flow for each rig was in excess of its respective carrying value. As a result, we concluded that no impairment of these rigs had occurred at September 30, 2020.

As discussed in Note 2, during the first quarter of 2020, the business climate in which we operate experienced a significant adverse change, which resulted in a dramatic decline in oil prices. During the first quarter of 2020, we evaluated five of our drilling rigs that had indicators of impairment. Based on our assumptions and analysis at that time, we determined that the carrying value of four of these rigs was impaired (we collectively refer to these four rigs as the 2020 Impaired Rigs).

We estimated the fair values of the 2020 Impaired Rigs using an income approach, whereby the fair value of each rig was estimated based on a calculation of the rig’s future net cash flows. These calculations utilized significant unobservable inputs, including management’s assumptions related to estimated dayrate revenue, rig utilization, estimated capital expenditures, repair and regulatory survey costs, as well as estimated proceeds that may be received on ultimate disposition of each rig. Our fair value estimates were representative of Level 3 fair value measurements due to the significant level of estimation involved and the lack of transparency as to the inputs used.

We recorded aggregate impairments of $774.0 million for the nine months ended September 30, 2020 related to our 2020 Impaired Rigs. See Note 7.

We evaluate our property and equipment for impairment whenever changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If market fundamentals in the offshore oil and gas industry deteriorate further or a market recovery is further delayed, we may be required to recognize additional impairment charges in future periods.