Accounting Pronouncements	6 Months Ended
Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Pronouncements	Note 2— Accounting Pronouncements Accounting Standards Adopted In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services and in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. We adopted ASU 2014-09 and its related amendments, or collectively Topic 606, effective January 1, 2018 using the modified retrospective implementation method. Accordingly, we have applied the five-step method outlined in Topic 606 for determining when and how revenue is recognized to all contracts that were not completed as of the date of adoption. Revenues for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported under the previous revenue recognition guidance. For contracts that were modified before the effective date, we have considered the modification guidance within the new standard and determined that the revenue recognized and contract balances recorded prior to adoption for such contracts were not impacted. While Topic 606 requires additional disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of our revenues. Our modified retrospective adoption, for which we were not required to make any material changes to the prior year presentation, did not have a material effect on our condensed consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017. We have adopted the new standard effective January 1, 2018 under the modified retrospective approach. Accordingly, “Other Assets” is reduced in our Condensed Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $149.9 million. In February 2018, the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the “Act”). This standard is effective for interim and annual reporting periods beginning after December 15, 2018 with early application permitted. We have elected to adopt the new standard effective January 1, 2018 under the modified retrospective approach. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act was recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” in our Condensed Consolidated Balance Sheet with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million. In March 2017, the FASB issued ASU No. 2017-7, which amends ASC Topic 715, “Compensation —Retirement Benefits; Improving the Presentation of Net Periodic Pension Cost and Postretirement Benefits Cost.” The amendments in this update require that an employer disaggregate the service cost component from the other components of net benefit cost for an entity's defined benefit pension and other postretirement plans. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The amendments in this update require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs, as defined in paragraphs 715-30-35-4 and 715-60-35-9, are required to be presented in the income statement separately from the service cost component and outside of income from operations. We adopted ASU No. 2017-7 effective January 1, 2018 and accordingly, we have made certain reclassifications between our “Contract drilling services” costs and “Interest income and other, net” on our Condensed Consolidated Statement of Operations. Issued Accounting Standards In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This standard is effective for interim and annual reporting periods beginning after December 15, 2018. We expect to adopt, on a modified retrospective basis, ASC 842 effective January 1, 2019. Our adoption requires that, as lessees, we recognize a right to use asset and lease liability. In addition, as lessors, our drilling contracts contain a lease component, which requires revenue presentation analysis. The ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We do not expect our adoption to materially affect our Condensed Consolidated Balance Sheet, Condensed Consolidated Statement of Operations, or Condensed Consolidated Statement of Cash Flows. We are currently evaluating what other effect, if any, ASC 842 will have on our condensed consolidated financial statements and related disclosures. With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our condensed consolidated financial statements.

Note 2— Accounting Pronouncements

Accounting Standards Adopted

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-9, which creates Accounting Standards Codification (“ASC”) Topic 606, “Revenue from Contracts with Customers,” and supersedes the revenue recognition requirements in Topic 605, “Revenue Recognition,” including most industry-specific revenue recognition guidance throughout the Industry Topics of the Codification. In addition, ASU No. 2014-9 supersedes the cost guidance in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts,” and creates new Subtopic 340-40, “Other Assets and Deferred Costs—Contracts with Customers.” Under the new guidance, revenue is recognized when a customer obtains control of promised goods or services and in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services.

We adopted ASU 2014-09 and its related amendments, or collectively Topic 606, effective January 1, 2018 using the modified retrospective implementation method. Accordingly, we have applied the five-step method outlined in Topic 606 for determining when and how revenue is recognized to all contracts that were not completed as of the date of adoption. Revenues for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported under the previous revenue recognition guidance. For contracts that were modified before the effective date, we have considered the modification guidance within the new standard and determined that the revenue recognized and contract balances recorded prior to adoption for such contracts were not impacted. While Topic 606 requires additional disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of our revenues. Our modified retrospective adoption, for which we were not required to make any material changes to the prior year presentation, did not have a material effect on our condensed consolidated financial statements.

In October 2016, the FASB issued ASU No. 2016-16, which amends ASC Topic 740, “Income Taxes.” The amendments in this update improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This standard is effective for interim and annual reporting periods beginning after December 15, 2017. We have adopted the new standard effective January 1, 2018 under the modified retrospective approach. Accordingly, “Other Assets” is reduced in our Condensed Consolidated Balance Sheet with a cumulative adjustment to retained earnings of approximately $149.9 million.

In February 2018, the FASB issued ASU No. 2018-2, which amends ASC Topic 220, “Income Statement—Reporting Comprehensive Income.” The amendments in this update allow for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (the “Act”). This standard is effective for interim and annual reporting periods beginning after December 15, 2018 with early application permitted. We have elected to adopt the new standard effective January 1, 2018 under the modified retrospective approach. The amendment should be applied on a retrospective basis to each period in which the effect of the change in the U.S. federal corporate income tax rate in the Act was recognized. As a result of the retrospective application, we will reduce “Accumulated Other Comprehensive Income” in our Condensed Consolidated Balance Sheet with a cumulative adjustment to “Retained Earnings” of approximately $5.5 million.

In March 2017, the FASB issued ASU No. 2017-7, which amends ASC Topic 715, “Compensation —Retirement Benefits; Improving the Presentation of Net Periodic Pension Cost and Postretirement Benefits Cost.” The amendments in this update require that an employer disaggregate the service cost component from the other components of net benefit cost for an entity's defined benefit pension and other postretirement plans. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. The amendments in this update require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs, as defined in paragraphs 715-30-35-4 and 715-60-35-9, are required to be presented in the income statement separately from the service cost component and outside of income from operations. We adopted ASU No. 2017-7 effective January 1, 2018 and accordingly, we have made certain reclassifications between our “Contract drilling services” costs and “Interest income and other, net” on our Condensed Consolidated Statement of Operations.

Issued Accounting Standards

In February 2016, the FASB issued ASU No. 2016-2, which creates ASC Topic 842, “Leases.” This standard is effective for interim and annual reporting periods beginning after December 15, 2018. We expect to adopt, on a modified retrospective basis, ASC 842 effective January 1, 2019. Our adoption requires that, as lessees, we recognize a right to use asset and lease liability. In addition, as lessors, our drilling contracts contain a lease component, which requires revenue presentation analysis. The ultimate effect on our consolidated financial statements, will be based on an evaluation of the contract-specific facts and circumstances. We do not expect our adoption to materially affect our Condensed Consolidated Balance Sheet, Condensed Consolidated Statement of Operations, or Condensed Consolidated Statement of Cash Flows. We are currently evaluating what other effect, if any, ASC 842 will have on our condensed consolidated financial statements and related disclosures.

With the exception of the updated standards discussed above, there have been no new accounting pronouncements not yet effective that have significance, or potential significance, to our condensed consolidated financial statements.