Fair Value of Financial Instruments	9 Months Ended
Fair Value of Financial Instruments	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments, Assets and Other Assets Financial Instruments and Other Assets Measured and Recognized at Fair Value We estimate fair value at a price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants in the principal market for the asset or liability. Our valuation techniques require inputs that we categorize using a three level hierarchy, from highest to lowest level of observable inputs. Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 inputs are quoted prices or other market data for similar assets and liabilities in active markets, or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 inputs are unobservable inputs based upon our own judgment and assumptions used to measure assets and liabilities at fair value. Classification of a financial asset or liability within the hierarchy is determined based on the lowest level of input that is significant to the fair value measurement. Other than the derivative instruments discussed in “Note 13 – Derivative Instruments,” we had no other material assets or liabilities measured and recognized at fair value on a recurring basis at September 30, 2019 and December 31, 2018. Fair Value of Other Financial Instruments Our other financial instruments include cash and cash equivalents, accounts receivable, accounts payable, held-to-maturity investments, short-term borrowings and long-term debt. The carrying value of our cash and cash equivalents, accounts receivable, accounts payable, and short-term borrowings approximates their fair value due to their short maturities. These short-term borrowings are classified as Level 2 in the fair value hierarchy. The fair value of our short-term and long-term borrowings are discussed in “Note 11 – Short-term Borrowings and Other Debt Obligations.” As of September 30, 2019 and December 31, 2018, we have $50 million of held-to-maturity Angolan government bonds maturing in 2020. The carrying value of $50 million in both periods approximate their fair value as of September 30, 2019 and December 31, 2018. We assess whether an other-than-temporary impairment loss on the investment has occurred due to a decline in fair value or other market conditions. If the fair value of the security is below amortized cost and it is more likely than not that we will not be able to recover its amortized cost basis before its stated maturity, we will record an other-than-temporary impairment charge in the Condensed Consolidated Statements of Operations. Non-recurring Fair Value Measurements - Impairments In the three and nine months ended September 30, 2019, our goodwill impairment tests indicated that our goodwill was impaired and as a result all of our reporting units were written down to their estimated fair value. The Level 3 fair values of our reporting units were determined using a combination of the income and market approach. The unobservable inputs to the income approach included each reporting unit’s estimated future cash flows and estimates of discount rates commensurate with the reporting unit’s risks. The market approach considered market multiples of comparable publicly traded companies to estimate fair value as a multiple of each reporting unit’s actual and forecasted earnings. See further discussion at “Note 8 – Goodwill.” In the nine months ended September 30, 2019, we recognized long-lived asset impairments to write-down our assets to the lower of carrying amount or fair value less cost to sell for our land drilling rigs. The change in our expectations of the market’s recovery, in addition to successive negative operating cash flows in certain disposal asset groups represented an indicator that those assets will no longer be recoverable over their remaining useful lives. The Level 3 fair values of the long-lived assets were determined using a combination of the market and income approach. See further discussion at “Note 7 - Long-Lived Asset Impairments.”

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.