Oceaneering International (OII) 10-Q 3 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	3 Months Ended
	Mar. 31, 2018	Apr. 27, 2018
Document Information [Line Items]
Entity Registrant Name	OCEANEERING INTERNATIONAL INC
Entity Central Index Key	73,756
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		98,531,607

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 334,910	$ 430,316
Accounts receivable, net of allowances for doubtful accounts	471,345	476,903
Inventory	185,009	215,282
Total Current Assets	1,105,745	1,187,402
Property and Equipment, at cost	2,821,826	2,815,579
Less accumulated depreciation	1,767,503	1,751,375
Net Property and Equipment	1,054,323	1,064,204
Other Assets:
Goodwill	512,164	455,599
Other non-current assets	256,449
Total Other Assets	768,613	772,344
Total Assets	2,928,681	3,023,950
Current Liabilities:
Accounts payable	82,995	85,539
Accrued liabilities	289,527	350,258
Total Current Liabilities	372,522	435,797
Long-term Debt	785,068	792,312
Other Long-term Liabilities	132,888	131,323
Commitments and Contingencies
Stockholders' Equity:
Common Stock	27,709	27,709
Additional paid-in capital	211,988	225,125
Treasury stock, at cost	(704,630)	(718,946)
Retained earnings	2,367,742	2,417,412
Accumulated other comprehensive income	(269,960)	(292,136)
Total Shareholders' Equity	1,632,849	1,659,164
Stockholders' Equity Attributable to Noncontrolling Interest	5,354	5,354
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,638,203	1,664,518
Total Liabilities and Sharesholders' Equity	$ 2,928,681	$ 3,023,950

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts receivable, allowances for doubtful accounts	$ 6,151	$ 6,217
Common Stock, par value	$ 0.25	$ 0.25
Common Stock, shares authorized	360,000,000	360,000,000
Common Stock, shares issued	110,834,088	110,834,088
Treasury stock, shares	12,304,723	12,554,714

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 416,413	$ 446,176
Cost of services and products	397,585	401,321
Gross Margin	18,828	44,855
Selling, general and administrative expense	45,977	45,005
Income from Operations	(27,149)	(150)
Interest income	2,592	1,337
Interest expense	(9,371)	(6,268)
Equity earnings (losses) of unconsolidated affiliates	(843)	(980)
Other income (expense), net	(8,474)	(2,556)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(43,245)	(8,617)
Provision for income taxes	5,888	(1,083)
Net Income	$ (49,133)	$ (7,534)
Cash Dividends declared per Share	$ 0	$ 0.15
Basic Earnings per Share	$ (0.50)	$ (0.08)
Weighted Average Number of Shares Outstanding, Basic	98,383	98,138
Diluted Earnings per Share	$ (0.50)	$ (0.08)
Weighted Average Number of Shares Outstanding, Diluted	98,383	98,138

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income	$ (49,133)	$ (7,534)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	22,176	(7,061)
Total other comprehensive income	22,176	(7,061)
Total Comprehensive Income	$ (26,957)	$ (14,595)

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net Income	$ (49,133)	$ (7,534)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	54,128	53,663
Deferred income tax provision	2,819	(19,943)
Net loss (gain) on sales of property and equipment	37	551
Noncash compensation	2,812	3,718
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable	20,815	59,997
Inventory	(2,985)	(17,515)
Other operating assets	6,535	(6,372)
Currency translation effect on working capital	5,559	1,472
Current liabilities	(41,194)	(30,636)
Other operating liabilities	6,225	21,604
Total adjustments to net income	54,751	66,539
Net Cash Provided by Operating Activities	5,618	59,005
Cash Flows from Investing Activities:
Purchases of property and equipment	(25,732)	(17,807)
Payments to Acquire Businesses, Net of Cash Acquired	(68,398)	0
Payments for (Proceeds from) Other Investing Activities	(202)	14,993
Distributions of capital from unconsolidated affiliates	1,579	707
Dispositions of property and equipment	0	1,357
Net Cash Used in Investing Activities	(92,349)	(30,736)
Cash Flows from Financing Activities:
Proceeds from Issuance of Long-term Debt	295,879	0
Repayments of Long-term Debt	(300,000)	0
Cash Dividends	0	(14,739)
Proceeds from (Payments for) Other Financing Activities	(1,635)	(1,894)
Net Cash Provided by (Used in) Financing Activities	(5,756)	(16,633)
Effect of Exchange Rate on Cash and Cash Equivalents	(2,919)	687
Net Increase (Decrease) in Cash and Cash Equivalents	(95,406)	12,323
Cash and Cash Equivalents-Beginning of Period	430,316	450,193
Cash and Cash Equivalents-End of Period	$ 334,910	$ 462,516

Summary Of Major Accounting Pol

Summary Of Major Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary Of Major Accounting Policies	SUMMARY OF MAJOR ACCOUNTING POLICIES Basis of Presentation . Oceaneering International, Inc. ("Oceaneering", "we" or "us") has prepared these unaudited consolidated financial statements pursuant to instructions for quarterly reports on Form 10-Q, which we are required to file with the U.S. Securities and Exchange Commission (the "SEC"). These financial statements do not include all information and footnotes normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). These financial statements reflect all adjustments that we believe are necessary to present fairly our financial position as of March 31, 2018 and our results of operations and cash flows for the periods presented. Except as otherwise disclosed herein, all such adjustments are of a normal and recurring nature. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in our annual report on Form 10-K for the year ended December 31, 2017 . The results for interim periods are not necessarily indicative of annual results. Principles of Consolidation. The consolidated financial statements include the accounts of Oceaneering and our 50% or more owned and controlled subsidiaries. We also consolidate entities that are determined to be variable interest entities if we determine that we are the primary beneficiary; otherwise, we account for those entities using the equity method of accounting. We use the equity method to account for our investments in unconsolidated affiliated companies of which we own an equity interest of between 20% and 50% and as to which we have significant influence, but not control, over operations. We use the cost method for all other long-term investments. Investments in entities that we do not consolidate are reflected on our balance sheet in Other non-current assets. All significant intercompany accounts and transactions have been eliminated. Use of Estimates. The preparation of financial statements in conformity with U.S. GAAP requires that our management make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents. Cash and cash equivalents include demand deposits and highly liquid investments with original maturities of three months or less from the date of investment. Accounts Receivable – Allowances for Doubtful Accounts. We determine the need for allowances for doubtful accounts using the specific identification method. We generally do not require collateral from our customers. Inventory . Inventory is valued at the lower of cost or net realizable value. We determine cost using the weighted-average method. Property and Equipment and Long-Lived Intangible Assets. We provide for depreciation of property and equipment on the straight-line method over their estimated useful lives. We charge the costs of repair and maintenance of property and equipment to operations as incurred, while we capitalize the costs of improvements that extend asset lives or functionality. Upon the disposition of property and equipment, the related cost and accumulated depreciation accounts are relieved and any resulting gain or loss is included as an adjustment to cost of services and products. Intangible assets, primarily acquired in connection with business combinations, include trade names, intellectual property and customer relationships and are being amortized over their estimated useful lives. We capitalize interest on assets where the construction period is anticipated to be more than three months. We capitalized $1.6 million and $1.0 million of interest in the three-month periods ended March 31, 2018 and 2017 , respectively. We do not allocate general administrative costs to capital projects. Our management periodically, and upon the occurrence of a triggering event, reviews the realizability of our property and equipment and long-lived intangible assets to determine whether any events or changes in circumstances indicate that the carrying amounts of the assets may not be recoverable. For long-lived assets to be held and used, we base our evaluation on impairment indicators, such as the nature of the assets, the future economic benefits of the assets, any historical or future profitability measurements and other external market conditions or factors that may be present. If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset may not be recoverable, we determine whether an impairment has occurred through the use of an undiscounted cash flows analysis of the asset at the lowest level for which identifiable cash flows exist. If an impairment has occurred, we recognize a loss for the difference between the carrying amount and the fair value of the asset. For assets held for sale or disposal, the fair value of the asset is measured using fair market value less estimated costs to sell. Assets are classified as held-for-sale when we have a plan for disposal of certain assets and those assets meet the held for sale criteria. Business Acquisitions . We account for business combinations using the acquisition method of accounting, and, in each case, we allocate the acquisition price to the assets acquired and liabilities assumed based on their fair market values at the date of acquisition. In March, 2018, we acquired Ecosse Subsea Limited (“Ecosse”) for $68 million in cash. Headquartered in Aberdeen, Scotland, Ecosse builds and operates seabed preparation, route clearance and trenching tools for submarine cables and pipelines on an integrated basis that includes vessels, ROVs and survey services. We have accounted for this acquisition by allocating the purchase price to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. This purchase price allocation is preliminary and is subject to change upon completion of our valuation procedures. We have included Ecosse’s operations in our consolidated financial statements starting from the date of closing and its operating results are reflected in our Subsea Projects segment. Goodwill. Annually, we are required to evaluate our goodwill by performing a qualitative or quantitative impairment test. However, under the qualitative approach and after assessing the totality of events or circumstances, we determine that it is more likely than not the fair value of a reporting unit is less than its carrying amount, we are required to perform the quantitative analysis to determine the fair value. We tested the goodwill attributable to each of our reporting units for impairment as of December 31, 2017 and concluded that there was no impairment. In addition to our annual evaluation of goodwill for impairment, upon the occurrence of a triggering event, we review our goodwill to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Foreign Currency Translation. The functional currency for several of our foreign subsidiaries is the applicable local currency. Results of operations for foreign subsidiaries with functional currencies other than the U.S. dollar are translated into U.S. dollars using average exchange rates during the period. Assets and liabilities of these foreign subsidiaries are translated into U.S. dollars using the exchange rates in effect at the balance sheet date, and the resulting translation adjustments are recognized, in accumulated other comprehensive income as a component of shareholders' equity. All foreign currency transaction gains and losses are recognized currently in the Consolidated Statements of Operations. Revenue Recognition. On January 1, 2018, we adopted Accounting Standard Update ("ASU") 2014-09, " Revenue from Contracts with Customers, " which implemented Accounting Standards Codification Topic 606 ("ASC 606"). We have used the modified retrospective method applied to those contracts which were not completed as of January 1, 2018, and the practical expedient to reflect the effect on contract modifications in the aggregate. In addition, we have recognized the cumulative effect of applying ASC 606 as an adjustment to retained earnings on January 1, 2018. The comparative information with respect to prior periods has not been retrospectively restated and continues to be reported under the accounting standards in effect for those periods. The cumulative effect of the changes made to our Consolidated Balance Sheet as of January 1, 2018 for the adoption of ASC 606 was as follows: (in thousands) Dec 31, 2017 Adjustments Due to ASC 606 Jan 1, 2018 Under ASC 606 Assets Accounts receivable $ 476,903 $ (163,963 ) $ 312,940 Contract assets — 171,956 171,956 Total accounts receivable 476,903 7,993 484,896 Inventory 215,282 (34,187 ) 181,095 Liabilities Accrued liabilities 350,258 (63,045 ) 287,213 Contract liabilities — 37,590 37,590 Total accrued liabilities 350,258 (25,455 ) 324,803 Other long-term liabilities 131,323 (202 ) 131,121 Equity Retained earnings 2,417,412 (537 ) 2,416,875 In accordance with the ASC 606 requirements, the impact of adoption on carryover contracts on our Consolidated Statement of Operations and Consolidated Balance Sheet was as follows: Consolidated Statement of Operations Three Months Ended Mar 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balances Without Adoption of ASC 606 Revenue $ 416,413 $ 6,064 $ 422,477 Cost of services and products 397,585 9,112 406,697 Provision (benefit) for income taxes 5,888 (654 ) 5,234 Net income (loss) (49,133 ) (2,394 ) (51,527 ) Consolidated Balance Sheet Mar 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balances Without Adoption of ASC 606 Assets Accounts receivable $ 300,976 $ — $ 300,976 Contract assets 170,369 (8,996 ) 161,373 Total accounts receivable 471,345 (8,996 ) 462,349 Inventory 185,009 24,767 209,776 Liabilities Accrued liabilities 258,975 (172 ) 258,803 Contract liabilities 30,552 18,252 48,804 Total accrued liabilities 289,527 18,080 307,607 Other long-term liabilities 132,888 (452 ) 132,436 Equity Retained earnings 2,367,742 (1,857 ) 2,365,885 All of our revenue is realized through contracts with customers. We recognize our revenue according to the contract type. On a daily basis, we recognize service revenue over time for contracts that provide for specific time, material and equipment charges, which we bill periodically, ranging from weekly to monthly. We use the input method to faithfully depict revenue recognition, because each day of service provided represents value to the customer. The performance obligations in these contracts are satisfied, and revenue is recognized, as the work is performed. We have used the expedient available to recognize revenue when the billing corresponds to the value realized by the customer where appropriate. We account for significant fixed-price contracts, mainly relating to our Subsea Products segment, and to a lesser extent in our Subsea Projects and Advanced Technologies segments, by recognizing revenue over time using an input, cost-to-cost measurement percentage-of-completion method. We use the input cost-to-cost method to faithfully depict revenue recognition. This commonly used method allows appropriate calculation of progress on our contracts. A performance obligation is satisfied as we create a product on behalf of the customer over the life of the contract. The remainder of our revenue is recognized at the point in time when control transfers to the customer, thus satisfying the performance obligation. We have elected to recognize the cost for freight and shipping as an expense when incurred. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by us from a customer, are excluded from revenue. In our service-based business lines, which principally charge on a day rate basis for services provided, there is no significant impact in the pattern of revenue and profit recognition as a result of implementation of ASC 606. In our product-based business lines, we expect impacts on the pattern of our revenue and profit recognition in our contracts using the percentage-of-completion method, as a result of the requirement to exclude uninstalled materials and significant inefficiencies from the measure of progress. This is most likely to occur in our Subsea Products segment. We apply judgment in the determination and allocation of transaction price to performance obligations, and the subsequent recognition of revenue, based on the facts and circumstances of each contract. We routinely review estimates related to our contracts and, where required, reflect revisions to profitability in earnings immediately. If an element of variable consideration has the potential for a significant future reversal of revenue, we will constrain that variable consideration to a level intended to remove the potential future reversal. If a current estimate of total contract cost indicates an ultimate loss on a contract, we recognize the projected loss in full when we determine it. In prior years, we have recorded adjustments to earnings as a result of revisions to contract estimates. We always strive to estimate our contract costs and profitability accurately. However, there could be significant adjustments to overall contract costs in the future, due to changes in facts and circumstances. In general, our payment terms consist of those services billed regularly as provided and those products delivered at a point in time, which are invoiced after the performance obligation is satisfied. Our product and service contracts with milestone payments due at agreed progress points during the contract are invoiced when those milestones are reached, which may differ from the timing of revenue recognition. Our payment terms generally do not provide financing of contracts to customers, nor do we receive financing from customers as a result of these terms. Please see Note 2 — "Revenue" — for more information on our revenue from contracts with customers. New Accounting Standards . In January 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-01, "Financial Instruments — Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities." This update: • requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value, with changes in fair value recognized in net income; and • provides an expedient for the valuation and impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify value and impairment — when a qualitative assessment indicates that an impairment exists, an entity is required to measure the investment at fair value. ASU No. 2016-01 was effective for us beginning on January 1, 2018, and we have utilized the expedient for valuing equity investments without readily determinable fair values. This update has not had a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases." This update requires reporting entities to separate the lease components from the non-lease components in a contract and recognize lease assets and lease liabilities on the balance sheet for substantially all lease arrangements. ASU No. 2016-02 will become effective for us beginning January 1, 2019. We have formed a project team to implement ASU 2016-02. We are currently evaluating the requirements of ASU 2016-02 and have not yet determined its impact on our consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740) – Intra-Entity Transfers of Assets Other than Inventory." Previously, U.S. GAAP generally prohibited the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset was sold to an outside party. The amendments in this update eliminate the exception for an intra-entity transfer of an asset other than inventory. Two common examples of assets included within the scope of this update are intellectual property and property, plant and equipment. The exception for an intra-entity transfer of inventory will remain in place. The amendments in this update were effective for us beginning January 1, 2018. This update has not had a material effect on our consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, "Income Statement – Reporting Comprehensive Income (Topic 220) Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." The amendments in this update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 2017 enactment of U.S. tax reform legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). However, because the amendments only relate to the reclassification of the income tax effects of the Tax Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The amendments in this update also require certain disclosures about stranded tax effects. The amendments in this update will become effective for us beginning January 1, 2019, and early adoption is permitted. We do not anticipate that this update will have a material effect on our consolidated financial statements.

Revenue Revenue

Revenue Revenue	3 Months Ended
	Mar. 31, 2018
Revenue [Abstract]
Revenue recognition [Text Block]	2. Revenue Revenue By Category The following table presents Revenue disaggregated by business segment, geographical region, and timing of transfer of goods or services. Three Months Ended (in thousands) Mar 31, 2018 Mar 31, 2017 Dec 31, 2017 Business Segment: Energy Services and Products Remotely Operated Vehicles $ 85,594 $ 94,022 $ 91,584 Subsea Products 126,688 150,639 156,398 Subsea Projects 56,860 62,956 73,376 Asset Integrity 61,288 52,658 64,830 Total Energy Services and Products 330,430 360,275 386,188 Advanced Technologies 85,983 85,901 97,987 Total $ 416,413 $ 446,176 $ 484,175 Geographic Operating Areas: Foreign: Africa $ 55,087 $ 80,512 $ 43,026 United Kingdom 45,319 66,746 46,643 Norway 39,042 29,800 49,747 Asia and Australia 38,946 45,867 46,310 Brazil 18,828 10,692 16,801 Other 19,639 14,604 26,823 Total Foreign 216,861 248,221 229,350 United States 199,552 197,955 254,825 Total $ 416,413 $ 446,176 $ 484,175 Timing of Transfer of Goods or Services: Revenue recognized over time $ 374,667 Revenue recognized at a point in time 41,746 Total $ 416,413 Contract Balances Our contracts with milestone payments have, in the aggregate, a significant impact on the contract asset and the contract liability balances. Milestones are contractually agreed with customers and relate to significant events across the contract lives. Some milestones are achieved before revenue is recognized, resulting in a contract liability, other milestones are achieved after revenue is recognized resulting in a contract asset. The following table provides information about contract assets, and contract liabilities from contracts with customers. (in thousands) Mar 31, 2018 Jan 1, 2018 Contract assets $ 170,369 $ 171,956 Contract liabilities 30,552 37,590 Our payment terms consist of those services billed regularly as provided and those products delivered at a point in time, which are invoiced after the performance obligation is satisfied. Our product and service contracts with milestone payments due at agreed progress points during the contract are invoiced when those milestones are reached, which may differ from the timing of revenue recognition. During the three months ended March 31, 2018 , Contract assets decreased by $1.6 million from its opening balance due to billings of $406 million , which exceeded accrued revenue of $404 million . Contract liabilities decreased $7 million from its opening balance, due to revenue recognition of $12 million (from the opening balance) less deferrals of milestone payments that totaled $5 million . There were no cancellations, impairments or other significant impacts in the period that relate to other categories of explanation. The revenue recognized for the three months ended March 31, 2018 that was included in the Contract liabilities balance at the beginning of the period was $12.5 million . Performance Obligations As of March 31, 2018, the aggregate amount of the transaction price allocated to remaining performance obligations was $295 million . We expect to recognize revenue for the remaining performance obligations of $221 million over the next twelve months. The aggregate amount of transaction price allocated to remaining performance obligations that were unsatisfied (or partially unsatisfied) as of March 31, 2018 are noted above. In arriving at this value, we have used two expedients available to us and are not disclosing amounts in relation to performance obligations: (1) that are part of contracts with an original expected duration of one year or less; or (2) on contracts where we recognize revenue in line with the billing. Due to the nature of our service contracts in our Remotely Operated Vehicle, Subsea Projects, Asset Integrity and Advanced Technologies segments, the majority of our contracts either have initial contract terms of one year or less or have customer option cancellation clauses that lead us to consider the original expected duration of one year or less. In our Subsea Products and Advanced Technologies segments, we have long-term contracts that extend beyond one year, and these make up the majority of the balance reported. We also have shorter-term product contracts with an expected original duration of one year or less that have been excluded. Where appropriate, we have made estimates within the transaction price of elements of variable consideration within the contracts and constrained those amounts to a level where we consider that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The amount of revenue recognized in the three months ended March 31, 2018 , which was associated with performance obligations completed or partially completed in prior periods was not significant. As of March 31, 2018 , there was no outstanding liability balance for refunds or returns due to the nature of our contracts and the goods and services we provide. Our warranties are limited to assurance warranties that are of a standard length and are not considered to be a material right . The majority of our contracts consist of a single performance obligation. When there are multiple obligations, we look for observable evidence of stand-alone selling prices on which to base the allocation. This involves judgment as to the appropriateness of the observable evidence relating to the facts and circumstances of the contract. If we do not have observable evidence, we estimate stand-alone selling prices by taking a cost plus margin approach, using typical margins from the type of product or service, customer and regional geography involved. Costs to Obtain or Fulfill a Contract In line with the available expedient, we capitalize costs to obtain a contract when those amounts are significant and the contract is expected at inception to exceed one year in duration; otherwise, the costs are expensed in the period when incurred. Costs to obtain a contract primarily consist of bid and proposal costs, which are incremental to our fixed costs. Costs to fulfill a contract primarily consist of certain mobilization costs incurred to provide products or services to our customers. These costs are deferred and amortized over the period of contract performance. There was no balance or amortization of Costs to obtain a contract in the current reporting period. The closing balance of Costs to fulfill a contract as of March 31, 2018 was $13.6 million and a total of $1.3 million of amortization, and no impairment costs, were recognized.

Inventory

Inventory	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventory	INVENTORY The following is information regarding our inventory: (in thousands) Mar 31, 2018 Dec 31, 2017 Inventory, net: Remotely operated vehicle parts and components $ 100,931 $ 97,313 Other inventory, primarily raw materials 84,078 117,969 Total $ 185,009 $ 215,282

Debt

Debt	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	DEBT Long-term Debt consisted of the following: (in thousands) Mar 31, 2018 Dec 31, 2017 4.650% Senior Notes due 2024 $ 500,000 $ 500,000 6.000% Senior Notes due 2028 300,000 — Term Loan Facility — 300,000 Fair value of interest rate swaps on $200 million of principal (6,353 ) (2,990 ) Unamortized debt issuance costs (8,579 ) (4,698 ) Revolving Credit Facility — — Long-term Debt $ 785,068 $ 792,312 In November 2014, we completed the public offering of $500 million aggregate principal amount of 4.650% Senior Notes due 2024 (the "2024 Senior Notes"). We pay interest on the 2024 Senior Notes on May 15 and November 15 of each year. The 2024 Senior Notes are scheduled to mature on November 15, 2024. In February 2018, we completed the public offering of $300 million aggregate principal amount of 6.000% Senior Notes due 2028 (the "2028 Senior Notes"). We will pay interest on the 2028 Senior Notes on February 1 and August 1 of each year, beginning on August 1, 2018. The 2028 Senior Notes are scheduled to mature on February 1, 2028. We may redeem some or all of the 2024 and the 2028 Senior Notes (collectively, the "Senior Notes") at specified redemption prices. We used the net proceeds from the 2028 Senior Notes to repay our term loan indebtedness described further below. In October 2014, we entered into a credit agreement (as amended, the "Credit Agreement") with a group of banks. In February 2018, we entered into Agreement and Amendment No. 4 to Credit Agreement ("Amendment No. 4"). The Credit Agreement provides for a $500 million revolving credit facility (the "Revolving Credit Facility"). The Credit Agreement previously provided for a $300 million term loan (the "Term Loan Facility"), which we repaid in full in February 2018, using net proceeds from the issuance of our 2028 Senior Notes referred to above, and cash on hand. Subject to certain conditions, the aggregate commitments under the Revolving Credit Facility may be increased by up to $300 million at any time upon agreement between us and existing or additional lenders. Amendment No. 4 amended the Credit Agreement to, among other things, extend the maturity of the Revolving Credit Facility to January 25, 2023 with the extending Lenders, which represent 90% of the existing commitments of the Lenders, such that the total commitments for the Revolving Credit Facility will be $500 million until October 25, 2021, and thereafter $450 million until January 25, 2023. Borrowings under the Revolving Credit Facility bear interest at an Adjusted Base Rate or the Eurodollar Rate (both as defined in the Credit Agreement), at our option, plus an applicable margin based on our Leverage Ratio (as defined in the Credit Agreement) and, at our election, based on the ratings of our senior unsecured debt by designated ratings services, thereafter to be based on such debt ratings. The applicable margin varies: (1) in the case of advances bearing interest at the Adjusted Base Rate, from 0.125% to 0.750% for borrowings under the Revolving Credit Facility; and (2) in the case of advances bearing interest at the Eurodollar Rate, from 1.125% to 1.750% . The Adjusted Base Rate is the highest of (1) the per annum rate established by the administrative agent as its prime rate, (2) the federal funds rate plus 0.50% and (3) the daily one-month LIBOR plus 1% . We pay a commitment fee ranging from 0.125% to 0.300% on the unused portion of the Revolving Credit Facility, depending on our Leverage Ratio. The commitment fees are included as interest expense in our consolidated financial statements. The Credit Agreement contains various covenants that we believe are customary for agreements of this nature, including, but not limited to, restrictions on our ability and the ability of each of our subsidiaries to incur debt, grant liens, make certain investments, make distributions, merge or consolidate, sell assets and enter into certain restrictive agreements. We are also subject to a maximum adjusted total capitalization ratio (as defined in the Credit Agreement) of 55%. The Credit Agreement includes customary events of default and associated remedies. As of March 31, 2018 , we were in compliance with all the covenants set forth in the Credit Agreement. We have two interest rate swaps in place on a total of $200 million of the 2024 Senior Notes for the period to November 2024. Please refer to Note 5 — "Commitments and Contingencies" — for more information on our interest rate swaps. We incurred $6.9 million and $4.1 million of issuance costs related to the 2024 Senior Notes and the 2028 Senior Notes, respectively, and $2.6 million of loan costs, including costs of the amendments prior to Amendment No. 4, related to the Credit Agreement. The costs, net of accumulated amortization, are included as a reduction of Long-term Debt in our Consolidated Balance Sheet, as it pertains to the Senior Notes, and in Other non-current assets, as it pertains to the Credit Agreement. We are amortizing these costs to Interest expense through the maturity date for the Senior Notes and to January 2023 for the Credit Agreement.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES Litigation. In the ordinary course of business, we are subject to actions for damages alleging personal injury under the general maritime laws of the United States, including the Jones Act, for alleged negligence. We report actions for personal injury to our insurance carriers and believe that the settlement or disposition of those claims will not have a material adverse effect on our consolidated financial position, results of operations or cash flows. Various other actions and claims are pending against us, most of which are covered by insurance. Although we cannot predict the ultimate outcome of these matters, we believe that our ultimate liability, if any, that may result from these other actions and claims will not materially affect our results of operations, cash flows or financial position. Financial Instruments and Risk Concentration. In the normal course of business, we manage risks associated with foreign exchange rates and interest rates through a variety of strategies, including the use of hedging transactions. As a matter of policy, we do not use derivative instruments unless we have an underlying exposure. Other financial instruments that potentially subject us to concentrations of credit risk are principally cash and cash equivalents and accounts receivable. The carrying values of cash and cash equivalents approximate their fair values due to the short-term maturity of the underlying instruments. Accounts receivable are generated from a broad group of customers, primarily from within the energy industry, which is our major source of revenue. Due to their short-term nature, carrying values of our accounts receivable and accounts payable approximate fair market values. We estimated the aggregate fair market value of the Senior Notes to be $791 million as of March 31, 2018 , based on quoted prices. Since the market for the Senior Notes is not an active market, the fair value of the Senior Notes is classified within Level 2 in the fair value hierarchy under U.S. GAAP (inputs other than quoted prices in active markets for similar assets and liabilities that are observable or can be corroborated by observable market data for substantially the full terms for the assets or liabilities). We have two interest rate swaps in place on a total of $200 million of the 2024 Senior Notes for the period to November 2024. The agreements swap the fixed interest rate of 4.650% on $100 million of the 2024 Senior Notes to the floating rate of one month LIBOR plus 2.426% and on another $100 million to one month LIBOR plus 2.823%. We estimate the combined fair value of the interest rate swaps to be a net liability of $6.4 million as of March 31, 2018 , which is included on our balance sheet in our Other Long-term Liabilities. These values were arrived at based on a discounted cash flow model using Level 2 inputs. Since the second quarter of 2015, the exchange rate for the Angolan kwanza relative to the U.S. dollar generally has been declining, although the exchange rate was relatively stable during 2017. As our functional currency in Angola is the U.S. dollar, we recorded foreign currency transaction losses related to the kwanza of $7.7 million and $0.5 million in the three-month periods ended March 31, 2018 and 2017 , respectively, as a component of Other income (expense), net in our Consolidated Statements of Operations for those respective periods. Our foreign currency transaction gains or losses related primarily to the remeasurement of our Angolan kwanza cash balances to U.S. dollars. Conversion of cash balances from kwanza to U.S. dollars is controlled by the central bank in Angola, and the central bank has slowed this process since mid-2015, causing our kwanza cash balances to subsequently increase. As of March 31, 2018 , we had the equivalent of approximately $22 million of kwanza cash balances in Angola reflected on our balance sheet. To mitigate our currency exposure risk in Angola, through March 31, 2018 , we used kwanza to purchase $68 million equivalent Angolan central bank (Banco Nacional de Angola) bonds, with maturities of $ 58 million in 2018 and $10 million in 2020. The bonds are denominated as U.S. dollar equivalents, so that, upon payment of semi-annual interest and principal upon maturity, payment is made in kwanza, equivalent to the respective U.S. dollars at the then-current exchange rate. The entire $68 million was classified as Other non-current assets on our Consolidated Balance Sheet as of December 31, 2017, as our intention was to reinvest funds from maturing bonds in similar long-term assets. However, the market to purchase similar long-term bonds is limited. As a result, we have classified the $58 million bonds due to mature in 2018 as Other current assets in our Consolidated Balance Sheet as of March 31, 2018. We estimated the fair market value of the Angolan bonds to be $68 million as of March 31, 2018 using quoted prices. Since the market for the Angolan bonds is not an active market, the fair value of the Angolan bonds is classified within Level 2 in the fair value hierarchy under U.S. GAAP.

Earnings Per Share, Stock-Based

Earnings Per Share, Stock-Based Compensation and Share Repurchase Plan	3 Months Ended
	Mar. 31, 2018
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Abstract]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation	Earnings per Share. For each period presented, the only difference between our calculated weighted average basic and diluted number of shares outstanding is the effect of outstanding restricted stock units. In periods where we have a net loss, the effect of our outstanding restricted stock units is anti-dilutive, and therefore does not increase our diluted shares outstanding. For each period presented, our net income (loss) allocable to both common shareholders and diluted common shareholders is the same as our net income (loss) in our consolidated statements of operations. Dividends. From the second quarter of 2014 through the third quarter of 2016, we paid a quarterly dividend to our common shareholders of $0.27 per share. Starting in the fourth quarter of 2016 through the third quarter 2017, we paid a dividend of $0.15 per share. Our last quarterly dividend was $0.15 per share and was declared in July 2017 and was paid in September 2017. Share-Based Compensation. We have no outstanding stock options and, therefore, no share-based compensation to be recognized pursuant to stock option grants. During 2017, 2016 and 2015, we granted restricted units of our common stock to certain of our key executives and employees. During 2017 and 2016, our Board of Directors granted restricted common stock to our nonemployee directors. During 2015, our Board of Directors granted restricted units of our common stock to our Chairman and restricted common stock to our other nonemployee directors. The restricted units granted to our key executives and key employees generally vest in full on the third anniversary of the award date, conditional on continued employment. The restricted stock unit grants, including those granted to our Chairman, can vest pro rata over three years, provided the individual meets certain age and years-of-service requirements. The shares of restricted common stock we grant to our non-employee directors vest in full on the first anniversary of the award date, conditional upon continued service as a director. Each grantee of shares of restricted stock is deemed to be the record owner of those shares during the restriction period, with the right to vote and receive any dividends on those shares. The restricted stock units outstanding have no voting or dividend rights. For each of the restricted stock units granted in 2015 through 2017 , at the earlier of three years after grant or at termination of employment or service, the grantee will be issued one share of our common stock for each unit vested. As of March 31, 2018 and December 31, 2017 , respective totals of 1,501,578 and 1,181,805 shares of restricted stock or restricted stock units were outstanding. We estimate that share-based compensation cost not yet recognized related to shares of restricted stock or restricted stock units, based on their grant-date fair values, was $19 million as of March 31, 2018 . This expense is being recognized on a staged-vesting basis over three years for awards attributable to individuals meeting certain age and years-of-service requirements, and on a straight-line basis over the applicable vesting period of one or three years for the other awards. Share Repurchase Plan. In December 2014, our Board of Directors approved a plan to repurchase up to 10 million shares of our common stock. Under this plan, we had repurchased 2.0 million shares of our common stock for $100 million through December 31, 2017 . We did not repurchase any shares under the plan during the three-month period ended March 31, 2018 . We account for the shares we hold in treasury under the cost method, at average cost.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES In December 2017, the United States enacted the Tax Act, which included a number of changes to existing U.S. tax laws that have an impact on our income tax provision, most notably a reduction of the U.S. corporate income tax rate from 35 percent to 21 percent for tax years beginning after December 31, 2017, and the creation of a territorial tax system with a one-time mandatory tax on applicable previously deferred earnings of foreign subsidiaries. We recognized the income tax effects of the Tax Act in our financial statements for the year ended December 31, 2017 in accordance with Staff Accounting Bulletin No. 118 (“SAB 118”), which provided SEC staff guidance for the application of accounting standards for income taxes in the reporting period in which the Tax Act was enacted. As such, our financial results reflected provisional amounts for those specific income tax effects of the Tax Act for which the accounting was incomplete but a reasonable estimate could be determined. The final determination is expected to be completed and reflected in our financial statements issued for subsequent reporting periods that fall within the measurement period contemplated by SAB 118. In April 2018, the United States Internal Revenue Service issued Notice 2018-26, announcing its intent to issue regulations related to the application of the one-time mandatory tax on applicable previously deferred earnings of foreign subsidiaries and potential anti-avoidance measures. Although the notice is not legally binding, we are currently reviewing whether the regulations contemplated by the notice could have any effect on the provisional amounts recorded as of December 31, 2017. During interim periods, we provide for income taxes based on our current estimated annual effective tax rate using assumptions as to (1) earnings and other factors that would affect the tax provision for the remainder of the year and (2) the operations of foreign branches and subsidiaries that are subject to local income and withholding taxes. In the three-month period ended March 31, 2018 , we recognized additional tax expense of $2.4 million from discrete items, primarily related to a $1.8 million of excess tax deficiencies on share-based compensation awards. The effective tax rate for the three months ended March 31, 2018 was different than the federal statutory rate of 21.0% , primarily due to the geographic mix of operating revenue and results that generated taxes in certain jurisdictions that exceeded the tax benefit from losses and credits in other jurisdictions, which could not be realized in the quarter due to valuation allowances being provided, and discrete items primarily associated with the shared-based compensation awards discussed above. It is our intention to continue to indefinitely reinvest in certain of our international operations, therefore, we do not provide withholding taxes on the possible distribution of these earnings. We do not believe the effective tax rate before discrete items is meaningful due to the short-term nature of much of our work and a continuous shifting of geographic mix of our operating revenue and results. The effective tax rate for the three months ended March 31, 2017 was lower than the federal statutory rate of 35.0% , primarily due to our intention to indefinitely reinvest in certain of our international operations, partially offset by additional discrete tax item associated with share-based compensation. In 2017, we did not provide for U.S. taxes on the portion of our foreign earnings that we deemed indefinitely reinvested. We conduct our international operations in a number of locations that have varying laws and regulations with regard to income and other taxes, some of which are subject to interpretation. We recognize the benefit for a tax position if the benefit is more likely than not to be sustainable upon audit by the applicable taxing authority. If this threshold is met, the tax benefit is then measured and recognized at the largest amount that we believe is greater than 50% likely of being realized upon ultimate settlement. We do not believe that the total of unrecognized tax benefits will increase or decrease significantly in the next twelve months. We account for any applicable interest and penalties on uncertain tax positions as a component of our provision for income taxes on our financial statements. Including associated foreign tax credits and penalties and interest, we have accrued a net total of $5.5 million in Other Long-term Liabilities on our balance sheet for unrecognized tax benefits as of March 31, 2018 . All additions or reductions to those liabilities would affect our effective income tax rate in the periods of change. Our tax returns are subject to audit by taxing authorities in multiple jurisdictions. These audits often take years to complete and settle. The following lists the earliest tax years open to examination by tax authorities where we have significant operations: Jurisdiction Periods United States 2014 United Kingdom 2015 Norway 2015 Angola 2013 Brazil 2013 Australia 2013

Business Segment Information

Business Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting, Measurement Disclosures [Abstract]
Business Segment Information	BUSINESS SEGMENT INFORMATION We are a global provider of engineered services and products, primarily to the offshore energy industry. Through the use of our applied technology expertise, we also serve the defense, aerospace and commercial theme park industries. Our Energy Services and Products business consists of Remotely Operated Vehicles ("ROVs"), Subsea Products, Subsea Projects and Asset Integrity. Our ROV segment provides submersible vehicles operated from the surface to support offshore energy exploration, development and production activities. Our Subsea Products segment supplies a variety of specialty subsea hardware and related services. Our Subsea Projects segment provides multiservice subsea support vessels and offshore diving and support vessel operations, primarily for inspection, maintenance and repair and installation activities. We have also provided survey, autonomous underwater vehicle and satellite-positioning services. Our Asset Integrity segment provides asset integrity management and assessment services, nondestructive testing and inspection. Our Advanced Technologies business provides project management, engineering services and equipment for applications in non-energy markets. Unallocated Expenses are those not associated with a specific business segment. These consist of expenses related to our incentive and deferred compensation plans, including restricted stock and bonuses, as well as other general expenses, including corporate administrative expenses. There are no differences in the basis of segmentation or in the basis of measurement of segment profit or loss from those used in our consolidated financial statements for the year ended December 31, 2017 . The table that follows presents Revenue, Income (Loss) from Operations and Depreciation and Amortization by business segment for each of the periods indicated. Three Months Ended (in thousands) Mar 31, 2018 Mar 31, 2017 Dec 31, 2017 Revenue Energy Services and Products Remotely Operated Vehicles $ 85,594 $ 94,022 $ 91,584 Subsea Products 126,688 150,639 156,398 Subsea Projects 56,860 62,956 73,376 Asset Integrity 61,288 52,658 64,830 Total Energy Services and Products 330,430 360,275 386,188 Advanced Technologies 85,983 85,901 97,987 Total $ 416,413 $ 446,176 $ 484,175 Income (Loss) from Operations Energy Services and Products Remotely Operated Vehicles $ (2,398 ) $ 5,925 $ 1,056 Subsea Products 1,755 11,483 11,121 Subsea Projects (2,359 ) 187 580 Asset Integrity 1,679 2,267 2,159 Total Energy Services and Products (1,323 ) 19,862 14,916 Advanced Technologies 1,668 5,026 2,779 Unallocated Expenses (27,494 ) (25,038 ) (26,810 ) Total $ (27,149 ) $ (150 ) $ (9,115 ) Depreciation and Amortization Energy Services and Products Remotely Operated Vehicles $ 27,642 $ 29,229 $ 27,445 Subsea Products 14,025 12,999 13,437 Subsea Projects 8,313 8,080 8,127 Asset Integrity 1,848 1,460 2,336 Total Energy Services and Products 51,828 51,768 51,345 Advanced Technologies 766 797 794 Unallocated Expenses 1,534 1,098 900 Total $ 54,128 $ 53,663 $ 53,039 We determine Income (Loss) from Operations for each business segment before interest income or expense, Other income (expense) and Provision for income taxes. We do not consider an allocation of these items to be practical. Our Equity in earnings (losses) of unconsolidated affiliates is part of our Subsea Projects segment.

Summary Of Major Accounting P15

Summary Of Major Accounting Policies (Policy)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation . Oceaneering International, Inc. ("Oceaneering", "we" or "us") has prepared these unaudited consolidated financial statements pursuant to instructions for quarterly reports on Form 10-Q, which we are required to file with the U.S. Securities and Exchange Commission (the "SEC"). These financial statements do not include all information and footnotes normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). These financial statements reflect all adjustments that we believe are necessary to present fairly our financial position as of March 31, 2018 and our results of operations and cash flows for the periods presented. Except as otherwise disclosed herein, all such adjustments are of a normal and recurring nature. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in our annual report on Form 10-K for the year ended December 31, 2017 . The results for interim periods are not necessarily indicative of annual results.
Principles of Consolidation	Principles of Consolidation. The consolidated financial statements include the accounts of Oceaneering and our 50% or more owned and controlled subsidiaries. We also consolidate entities that are determined to be variable interest entities if we determine that we are the primary beneficiary; otherwise, we account for those entities using the equity method of accounting. We use the equity method to account for our investments in unconsolidated affiliated companies of which we own an equity interest of between 20% and 50% and as to which we have significant influence, but not control, over operations. We use the cost method for all other long-term investments. Investments in entities that we do not consolidate are reflected on our balance sheet in Other non-current assets. All significant intercompany accounts and transactions have been eliminated.
Use Of Estimates	Use of Estimates. The preparation of financial statements in conformity with U.S. GAAP requires that our management make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.
Reclassification
Cash and Cash Equivalents	Cash and Cash Equivalents. Cash and cash equivalents include demand deposits and highly liquid investments with original maturities of three months or less from the date of investment.
Accounts Receivable	Accounts Receivable – Allowances for Doubtful Accounts. We determine the need for allowances for doubtful accounts using the specific identification method. We generally do not require collateral from our customers.
Inventory	Inventory . Inventory is valued at the lower of cost or net realizable value. We determine cost using the weighted-average method.
Property and Equipment	Property and Equipment and Long-Lived Intangible Assets. We provide for depreciation of property and equipment on the straight-line method over their estimated useful lives. We charge the costs of repair and maintenance of property and equipment to operations as incurred, while we capitalize the costs of improvements that extend asset lives or functionality. Upon the disposition of property and equipment, the related cost and accumulated depreciation accounts are relieved and any resulting gain or loss is included as an adjustment to cost of services and products. Intangible assets, primarily acquired in connection with business combinations, include trade names, intellectual property and customer relationships and are being amortized over their estimated useful lives. We capitalize interest on assets where the construction period is anticipated to be more than three months. We capitalized $1.6 million and $1.0 million of interest in the three-month periods ended March 31, 2018 and 2017 , respectively. We do not allocate general administrative costs to capital projects. Our management periodically, and upon the occurrence of a triggering event, reviews the realizability of our property and equipment and long-lived intangible assets to determine whether any events or changes in circumstances indicate that the carrying amounts of the assets may not be recoverable. For long-lived assets to be held and used, we base our evaluation on impairment indicators, such as the nature of the assets, the future economic benefits of the assets, any historical or future profitability measurements and other external market conditions or factors that may be present. If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset may not be recoverable, we determine whether an impairment has occurred through the use of an undiscounted cash flows analysis of the asset at the lowest level for which identifiable cash flows exist. If an impairment has occurred, we recognize a loss for the difference between the carrying amount and the fair value of the asset. For assets held for sale or disposal, the fair value of the asset is measured using fair market value less estimated costs to sell. Assets are classified as held-for-sale when we have a plan for disposal of certain assets and those assets meet the held for sale criteria.
Business Acquisitions	Business Acquisitions . We account for business combinations using the acquisition method of accounting, and, in each case, we allocate the acquisition price to the assets acquired and liabilities assumed based on their fair market values at the date of acquisition. In March, 2018, we acquired Ecosse Subsea Limited (“Ecosse”) for $68 million in cash. Headquartered in Aberdeen, Scotland, Ecosse builds and operates seabed preparation, route clearance and trenching tools for submarine cables and pipelines on an integrated basis that includes vessels, ROVs and survey services. We have accounted for this acquisition by allocating the purchase price to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. This purchase price allocation is preliminary and is subject to change upon completion of our valuation procedures. We have included Ecosse’s operations in our consolidated financial statements starting from the date of closing and its operating results are reflected in our Subsea Projects segment.
Goodwill and Intangible Assets	Goodwill. Annually, we are required to evaluate our goodwill by performing a qualitative or quantitative impairment test. However, under the qualitative approach and after assessing the totality of events or circumstances, we determine that it is more likely than not the fair value of a reporting unit is less than its carrying amount, we are required to perform the quantitative analysis to determine the fair value. We tested the goodwill attributable to each of our reporting units for impairment as of December 31, 2017 and concluded that there was no impairment. In addition to our annual evaluation of goodwill for impairment, upon the occurrence of a triggering event, we review our goodwill to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation. The functional currency for several of our foreign subsidiaries is the applicable local currency. Results of operations for foreign subsidiaries with functional currencies other than the U.S. dollar are translated into U.S. dollars using average exchange rates during the period. Assets and liabilities of these foreign subsidiaries are translated into U.S. dollars using the exchange rates in effect at the balance sheet date, and the resulting translation adjustments are recognized, in accumulated other comprehensive income as a component of shareholders' equity. All foreign currency transaction gains and losses are recognized currently in the Consolidated Statements of Operations.
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition. On January 1, 2018, we adopted Accounting Standard Update ("ASU") 2014-09, " Revenue from Contracts with Customers, " which implemented Accounting Standards Codification Topic 606 ("ASC 606"). We have used the modified retrospective method applied to those contracts which were not completed as of January 1, 2018, and the practical expedient to reflect the effect on contract modifications in the aggregate. In addition, we have recognized the cumulative effect of applying ASC 606 as an adjustment to retained earnings on January 1, 2018. The comparative information with respect to prior periods has not been retrospectively restated and continues to be reported under the accounting standards in effect for those periods. The cumulative effect of the changes made to our Consolidated Balance Sheet as of January 1, 2018 for the adoption of ASC 606 was as follows: (in thousands) Dec 31, 2017 Adjustments Due to ASC 606 Jan 1, 2018 Under ASC 606 Assets Accounts receivable $ 476,903 $ (163,963 ) $ 312,940 Contract assets — 171,956 171,956 Total accounts receivable 476,903 7,993 484,896 Inventory 215,282 (34,187 ) 181,095 Liabilities Accrued liabilities 350,258 (63,045 ) 287,213 Contract liabilities — 37,590 37,590 Total accrued liabilities 350,258 (25,455 ) 324,803 Other long-term liabilities 131,323 (202 ) 131,121 Equity Retained earnings 2,417,412 (537 ) 2,416,875 In accordance with the ASC 606 requirements, the impact of adoption on carryover contracts on our Consolidated Statement of Operations and Consolidated Balance Sheet was as follows: Consolidated Statement of Operations Three Months Ended Mar 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balances Without Adoption of ASC 606 Revenue $ 416,413 $ 6,064 $ 422,477 Cost of services and products 397,585 9,112 406,697 Provision (benefit) for income taxes 5,888 (654 ) 5,234 Net income (loss) (49,133 ) (2,394 ) (51,527 ) Consolidated Balance Sheet Mar 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balances Without Adoption of ASC 606 Assets Accounts receivable $ 300,976 $ — $ 300,976 Contract assets 170,369 (8,996 ) 161,373 Total accounts receivable 471,345 (8,996 ) 462,349 Inventory 185,009 24,767 209,776 Liabilities Accrued liabilities 258,975 (172 ) 258,803 Contract liabilities 30,552 18,252 48,804 Total accrued liabilities 289,527 18,080 307,607 Other long-term liabilities 132,888 (452 ) 132,436 Equity Retained earnings 2,367,742 (1,857 ) 2,365,885 All of our revenue is realized through contracts with customers. We recognize our revenue according to the contract type. On a daily basis, we recognize service revenue over time for contracts that provide for specific time, material and equipment charges, which we bill periodically, ranging from weekly to monthly. We use the input method to faithfully depict revenue recognition, because each day of service provided represents value to the customer. The performance obligations in these contracts are satisfied, and revenue is recognized, as the work is performed. We have used the expedient available to recognize revenue when the billing corresponds to the value realized by the customer where appropriate. We account for significant fixed-price contracts, mainly relating to our Subsea Products segment, and to a lesser extent in our Subsea Projects and Advanced Technologies segments, by recognizing revenue over time using an input, cost-to-cost measurement percentage-of-completion method. We use the input cost-to-cost method to faithfully depict revenue recognition. This commonly used method allows appropriate calculation of progress on our contracts. A performance obligation is satisfied as we create a product on behalf of the customer over the life of the contract. The remainder of our revenue is recognized at the point in time when control transfers to the customer, thus satisfying the performance obligation. We have elected to recognize the cost for freight and shipping as an expense when incurred. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by us from a customer, are excluded from revenue. In our service-based business lines, which principally charge on a day rate basis for services provided, there is no significant impact in the pattern of revenue and profit recognition as a result of implementation of ASC 606. In our product-based business lines, we expect impacts on the pattern of our revenue and profit recognition in our contracts using the percentage-of-completion method, as a result of the requirement to exclude uninstalled materials and significant inefficiencies from the measure of progress. This is most likely to occur in our Subsea Products segment. We apply judgment in the determination and allocation of transaction price to performance obligations, and the subsequent recognition of revenue, based on the facts and circumstances of each contract. We routinely review estimates related to our contracts and, where required, reflect revisions to profitability in earnings immediately. If an element of variable consideration has the potential for a significant future reversal of revenue, we will constrain that variable consideration to a level intended to remove the potential future reversal. If a current estimate of total contract cost indicates an ultimate loss on a contract, we recognize the projected loss in full when we determine it. In prior years, we have recorded adjustments to earnings as a result of revisions to contract estimates. We always strive to estimate our contract costs and profitability accurately. However, there could be significant adjustments to overall contract costs in the future, due to changes in facts and circumstances. In general, our payment terms consist of those services billed regularly as provided and those products delivered at a point in time, which are invoiced after the performance obligation is satisfied. Our product and service contracts with milestone payments due at agreed progress points during the contract are invoiced when those milestones are reached, which may differ from the timing of revenue recognition. Our payment terms generally do not provide financing of contracts to customers, nor do we receive financing from customers as a result of these terms. Please see Note 2 — "Revenue" — for more information on our revenue from contracts with customers.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Standards . In January 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-01, "Financial Instruments — Overall (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities." This update: • requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value, with changes in fair value recognized in net income; and • provides an expedient for the valuation and impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify value and impairment — when a qualitative assessment indicates that an impairment exists, an entity is required to measure the investment at fair value. ASU No. 2016-01 was effective for us beginning on January 1, 2018, and we have utilized the expedient for valuing equity investments without readily determinable fair values. This update has not had a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases." This update requires reporting entities to separate the lease components from the non-lease components in a contract and recognize lease assets and lease liabilities on the balance sheet for substantially all lease arrangements. ASU No. 2016-02 will become effective for us beginning January 1, 2019. We have formed a project team to implement ASU 2016-02. We are currently evaluating the requirements of ASU 2016-02 and have not yet determined its impact on our consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740) – Intra-Entity Transfers of Assets Other than Inventory." Previously, U.S. GAAP generally prohibited the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset was sold to an outside party. The amendments in this update eliminate the exception for an intra-entity transfer of an asset other than inventory. Two common examples of assets included within the scope of this update are intellectual property and property, plant and equipment. The exception for an intra-entity transfer of inventory will remain in place. The amendments in this update were effective for us beginning January 1, 2018. This update has not had a material effect on our consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, "Income Statement – Reporting Comprehensive Income (Topic 220) Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." The amendments in this update allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 2017 enactment of U.S. tax reform legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). However, because the amendments only relate to the reclassification of the income tax effects of the Tax Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The amendments in this update also require certain disclosures about stranded tax effects. The amendments in this update will become effective for us beginning January 1, 2019, and early adoption is permitted. We do not anticipate that this update will have a material effect on our consolidated financial statements

Summary Of Major Accounting P16

Summary Of Major Accounting Policies Summary of Major Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block]	The cumulative effect of the changes made to our Consolidated Balance Sheet as of January 1, 2018 for the adoption of ASC 606 was as follows: (in thousands) Dec 31, 2017 Adjustments Due to ASC 606 Jan 1, 2018 Under ASC 606 Assets Accounts receivable $ 476,903 $ (163,963 ) $ 312,940 Contract assets — 171,956 171,956 Total accounts receivable 476,903 7,993 484,896 Inventory 215,282 (34,187 ) 181,095 Liabilities Accrued liabilities 350,258 (63,045 ) 287,213 Contract liabilities — 37,590 37,590 Total accrued liabilities 350,258 (25,455 ) 324,803 Other long-term liabilities 131,323 (202 ) 131,121 Equity Retained earnings 2,417,412 (537 ) 2,416,875 In accordance with the ASC 606 requirements, the impact of adoption on carryover contracts on our Consolidated Statement of Operations and Consolidated Balance Sheet was as follows: Consolidated Statement of Operations Three Months Ended Mar 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balances Without Adoption of ASC 606 Revenue $ 416,413 $ 6,064 $ 422,477 Cost of services and products 397,585 9,112 406,697 Provision (benefit) for income taxes 5,888 (654 ) 5,234 Net income (loss) (49,133 ) (2,394 ) (51,527 ) Consolidated Balance Sheet Mar 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balances Without Adoption of ASC 606 Assets Accounts receivable $ 300,976 $ — $ 300,976 Contract assets 170,369 (8,996 ) 161,373 Total accounts receivable 471,345 (8,996 ) 462,349 Inventory 185,009 24,767 209,776 Liabilities Accrued liabilities 258,975 (172 ) 258,803 Contract liabilities 30,552 18,252 48,804 Total accrued liabilities 289,527 18,080 307,607 Other long-term liabilities 132,888 (452 ) 132,436 Equity Retained earnings 2,367,742 (1,857 ) 2,365,885

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue [Abstract]
Revenue from External Customers by Geographic Areas [Table Text Block]	Geographic Operating Areas: Foreign: Africa $ 55,087 $ 80,512 $ 43,026 United Kingdom 45,319 66,746 46,643 Norway 39,042 29,800 49,747 Asia and Australia 38,946 45,867 46,310 Brazil 18,828 10,692 16,801 Other 19,639 14,604 26,823 Total Foreign 216,861 248,221 229,350 United States 199,552 197,955 254,825 Total $ 416,413 $ 446,176 $ 484,175
Revenue by Timing of Transfer of Goods or Services [Table Text Block]	Timing of Transfer of Goods or Services: Revenue recognized over time $ 374,667 Revenue recognized at a point in time 41,746 Total $ 416,413
Revenue from External Customers by Products and Services [Table Text Block]	The following table presents Revenue disaggregated by business segment, geographical region, and timing of transfer of goods or services. Three Months Ended (in thousands) Mar 31, 2018 Mar 31, 2017 Dec 31, 2017 Business Segment: Energy Services and Products Remotely Operated Vehicles $ 85,594 $ 94,022 $ 91,584 Subsea Products 126,688 150,639 156,398 Subsea Projects 56,860 62,956 73,376 Asset Integrity 61,288 52,658 64,830 Total Energy Services and Products 330,430 360,275 386,188 Advanced Technologies 85,983 85,901 97,987 Total $ 416,413 $ 446,176 $ 484,175

Inventory (Tables)

Inventory (Tables)	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventory [Table Text Block]	(in thousands) Mar 31, 2018 Dec 31, 2017 Inventory, net: Remotely operated vehicle parts and components $ 100,931 $ 97,313 Other inventory, primarily raw materials 84,078 117,969 Total $ 185,009 $ 215,282

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Instrument [Line Items]
Schedule of Debt [Table Text Block]	Long-term Debt consisted of the following: (in thousands) Mar 31, 2018 Dec 31, 2017 4.650% Senior Notes due 2024 $ 500,000 $ 500,000 6.000% Senior Notes due 2028 300,000 — Term Loan Facility — 300,000 Fair value of interest rate swaps on $200 million of principal (6,353 ) (2,990 ) Unamortized debt issuance costs (8,579 ) (4,698 ) Revolving Credit Facility — — Long-term Debt $ 785,068 $ 792,312

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Summary of Income Tax Examinations	The following lists the earliest tax years open to examination by tax authorities where we have significant operations: Jurisdiction Periods United States 2014 United Kingdom 2015 Norway 2015 Angola 2013 Brazil 2013 Australia 2013

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting, Measurement Disclosures [Abstract]
Financial Data By Business Segment	The table that follows presents Revenue, Income (Loss) from Operations and Depreciation and Amortization by business segment for each of the periods indicated. Three Months Ended (in thousands) Mar 31, 2018 Mar 31, 2017 Dec 31, 2017 Revenue Energy Services and Products Remotely Operated Vehicles $ 85,594 $ 94,022 $ 91,584 Subsea Products 126,688 150,639 156,398 Subsea Projects 56,860 62,956 73,376 Asset Integrity 61,288 52,658 64,830 Total Energy Services and Products 330,430 360,275 386,188 Advanced Technologies 85,983 85,901 97,987 Total $ 416,413 $ 446,176 $ 484,175 Income (Loss) from Operations Energy Services and Products Remotely Operated Vehicles $ (2,398 ) $ 5,925 $ 1,056 Subsea Products 1,755 11,483 11,121 Subsea Projects (2,359 ) 187 580 Asset Integrity 1,679 2,267 2,159 Total Energy Services and Products (1,323 ) 19,862 14,916 Advanced Technologies 1,668 5,026 2,779 Unallocated Expenses (27,494 ) (25,038 ) (26,810 ) Total $ (27,149 ) $ (150 ) $ (9,115 ) Depreciation and Amortization Energy Services and Products Remotely Operated Vehicles $ 27,642 $ 29,229 $ 27,445 Subsea Products 14,025 12,999 13,437 Subsea Projects 8,313 8,080 8,127 Asset Integrity 1,848 1,460 2,336 Total Energy Services and Products 51,828 51,768 51,345 Advanced Technologies 766 797 794 Unallocated Expenses 1,534 1,098 900 Total $ 54,128 $ 53,663 $ 53,039

Summary Of Major Accounting P22

Summary Of Major Accounting Policies - Principles of Consolidation And Repurchases (Details)	Mar. 31, 2018
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Percentage	50.00%
Equity Method Investment, Ownership Interest Threshold For Consolidation, Percentage	20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest Threshold For Consolidation, Percentage	50.00%

Summary Of Major Accounting P23

Summary Of Major Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Interest Costs, Capitalized During Period	$ 1,578	$ 1,039

Summary Of Major Accounting P24

Summary Of Major Accounting Policies Business Combination Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 68,398	$ 0

Summary Of Major Accounting P25

Summary Of Major Accounting Policies Summary of Major Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, billed	$ 300,976
Revenues	416,413	$ 484,175	$ 446,176
Revenue, adjusted	422,477
effect of change, revenue	6,064
Cost of Goods and Services Sold	397,585		401,321
Cost of services and products, adjusted	406,697
Effect of change, cost of services and products	9,112
Income Tax Expense (Benefit)	5,888		(1,083)
Income taxes, adjusted	5,234
Effect of change, income taxes	(654)
Accounts Receivable, Net, Current	471,345	476,903
Effect of change, total accounts receivable	(8,996)			$ 7,993
Effect of change, accounts receivable	0			(163,963)
Total accounts receivable, adjusted	462,349			484,896
Accounts receivable, adjusted	300,976			312,940
Inventory, Net	185,009	215,282
Inventory, adjusted	209,776			181,095
Accrued liabilities, excluding deferred revenue	258,975
Unbilled Receivables, Current	170,369	0		171,956
Unbilled accounts receivable, current, adjusted	161,373
Effect of change, unbilled accounts receivable	(8,996)
Inventory, Gross		215,282
Accrued Liabilities, Current	289,527	350,258
Accrued liabilities, (excl deferred revenue) adjusted	258,803			287,213
Total accrued liabilities, adjusted	307,607			324,803
Effect of change, accrued liabilities	(172)			(63,045)
Effect of change, total accrued liabilities	18,080			(25,455)
Deferred Revenue	30,552	0		37,590
Effect of change, deferred revenue	18,252
Deferred revenue without adoption of ASC 606	48,804
Effect of change, inventory	24,767			(34,187)
Other Liabilities, Noncurrent	132,888	131,323
Other long-term liabilities, adjusted	132,436			131,121
Effect of change, other long -term liabilities	(452)			(202)
Retained Earnings (Accumulated Deficit)	2,367,742	$ 2,417,412		2,416,875
Effect of change, retained earnings	(1,857)			$ (537)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(49,133)		$ (7,534)
Effect of change, Net Income	(2,394)
Retained earnings, adjusted	2,365,885
Net income, adjusted	$ (51,527)

Revenue Revenue by Timing of Tr

Revenue Revenue by Timing of Transfer of Goods or Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Revenue Recognition [Abstract]
Revenue over time	$ 374,667
Revenue at a point in time	41,746
Revenues	$ 416,413	$ 484,175	$ 446,176

Revenue (Details)

Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 416,413	$ 484,175	$ 446,176
Rovs Member
Segment Reporting Information [Line Items]
Revenues	85,594	91,584	94,022
Subsea Products Member
Segment Reporting Information [Line Items]
Revenues	126,688	156,398	150,639
Subsea Projects Member
Segment Reporting Information [Line Items]
Revenues	56,860	73,376	62,956
Asset Integrity [Member]
Segment Reporting Information [Line Items]
Revenues	61,288	64,830	52,658
Oil And Gas [Member]
Segment Reporting Information [Line Items]
Revenues	330,430	386,188	360,275
Advanced Technologies Member
Segment Reporting Information [Line Items]
Revenues	$ 85,983	$ 97,987	$ 85,901

Revenue by Geographic Area (Det

Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Revenue by Geographic Area [Line Items]
Revenues	$ 416,413	$ 484,175	$ 446,176
Africa [Member]
Revenue by Geographic Area [Line Items]
Revenues	55,087	43,026	80,512
United Kingdom Member
Revenue by Geographic Area [Line Items]
Revenues	45,319	46,643	66,746
Norway Member
Revenue by Geographic Area [Line Items]
Revenues	39,042	49,747	29,800
Asia Pacific [Member]
Revenue by Geographic Area [Line Items]
Revenues	38,946	46,310	45,867
Brazil Member
Revenue by Geographic Area [Line Items]
Revenues	18,828	16,801	10,692
Segment, Geographical, Groups of Countries, Group Three [Member]
Revenue by Geographic Area [Line Items]
Revenues	19,639	26,823	14,604
Segment, Geographical, Groups of Countries, Foreign [Member]
Revenue by Geographic Area [Line Items]
Revenues	216,861	229,350	248,221
UNITED STATES
Revenue by Geographic Area [Line Items]
Revenues	$ 199,552	$ 254,825	$ 197,955

Revenue Contract balances (Deta

Revenue Contract balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Jan. 01, 2018
Revenue Recognition [Abstract]
Increase (Decrease) in Unbilled Receivables	$ 1,600
Unbilled Receivables, Current	170,369	$ 0		$ 171,956
Deferred Revenue	30,552	0		$ 37,590
Billing for the reporting period	406,000
Revenue recognized but unbilled	404,000
Revenues	416,413	$ 484,175	$ 446,176
Increase or decrease in deferred revenue	7,000
Deferred Revenue, Revenue Recognized	12,000
Deferrals of customer payments	5,000
revenue recognized, included in beginning balance of contract liability	$ 12,500

Revenue Performance obligation

Revenue Performance obligation (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue Recognition [Abstract]
Revenue Recognition for Remaining Performance Obligations	$ 221
Price Allocated to Remaining Performance Obligations	$ 295

Revenue Costs to obtain or fulf

Revenue Costs to obtain or fulfill a contract (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue Recognition [Abstract]
Costs to fulfill a contract	$ 13.6
Accumulated Amortization of Other Deferred Costs	$ 1.3

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventory for remotely operated vehicles	$ 100,931	$ 97,313
Other inventory, primarily raw materials	84,078	117,969
Total	$ 185,009	$ 215,282

Debt - Long-Term Debt (Details)

Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2014	Mar. 31, 2018	Dec. 31, 2017	Nov. 21, 2014
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.65%
Payments of Debt Issuance Costs	$ 6,900
Notes Payable, Fair Value Disclosure		$ 791,000
4.650% Senior Notes due 2024		500,000	$ 500,000	$ 500,000
Senior Notes 2028		300,000	0
Unamortized Debt Issuance Expense		(8,579)	(4,698)
Fair Value Hedge Liabilities		(6,353)	(2,990)
Loans Payable to Bank		0	300,000
Revolving credit facility		0	0
Long-term Debt		$ 785,068	$ 792,312

Debt - Line of Credit (Details)

Debt - Line of Credit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2014
Line of Credit Facility [Line Items]
Line of Credit Facility, Available Additional Borrowing Capacity	$ 300
Payments of Financing Costs		$ 2.6
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.125%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 500
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Adjusted Base Rate [Member] | Federal Funds Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	0.50%
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Adjusted Base Rate [Member] | Eurodollar Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	1.00%
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Applicable Margin [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	0.125%
Credit Agreement [Member] | Adjusted Base Rate Advances [Member] | Applicable Margin [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	0.75%
Credit Agreement [Member] | Eurodollar Advances [Member] | Applicable Margin [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	1.125%
Credit Agreement [Member] | Eurodollar Advances [Member] | Applicable Margin [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Basis Spread on Variable Rate	1.75%

Commitments And Contingencies -

Commitments And Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Cash and cash equivalents	$ 334,910	$ 462,516	$ 430,316	$ 450,193
Derivative, Amount of Hedged Item	200,000
Fair Value Hedge Liabilities	(6,353)		(2,990)
Other income (expense), net	(8,474)	(2,556)
Loans Payable to Bank	0		$ 300,000
Notes Payable, Fair Value Disclosure	791,000
Other Income [Member]
Loss Contingencies [Line Items]
Other income (expense), net		$ 500
Angola, Kwanza
Loss Contingencies [Line Items]
Cash and cash equivalents	21,904
Angola [Member]
Loss Contingencies [Line Items]
Investments and Other Noncurrent Assets	68,078
Fair Value, Inputs, Level 2 [Member]
Loss Contingencies [Line Items]
Investments, Fair Value Disclosure	$ 68,042

Earnings Per Share, Stock-Bas36

Earnings Per Share, Stock-Based Compensation and Share Repurchase Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 12, 2014
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,501,578		1,181,805
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				10,000,000
Stock Repurchase Program, Total Number of Shares Repurchased To Date	2,000,000
Stock Repurchase Program, Total Shares Repurchased To Date, Amount	$ 100
Restricted Stock Units (RSUs) [Member]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options	$ 19
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Dividend Declared [Member]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.15	$ 0.27

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Loss Carryforwards [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	$ 2.4
Discrete item 1	$ 1.8
Effective income tax rate continuing operations		12.60%
Federal statutory tax rate	21.00%	35.00%
Unrecognized Tax Benefits, Probability Threshold of Realizing for Tax Benefits Recognition, Minimum Percentage	50.00%
Unrecognized Tax Benefits, Including Foreign Tax Credits and Penalties and Interest	$ 5.5

Income Taxes - Summary Of Earli

Income Taxes - Summary Of Earliest Tax Years Open To Examination (Details)	3 Months Ended
	Mar. 31, 2018
United States [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2,014
United Kingdom [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2,015
Norway [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2,015
Angola [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2,013
Brazil [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2,013
Australia [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2,013

Business Segment Information -

Business Segment Information - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 416,413	$ 484,175	$ 446,176
Income from Operations	(27,149)	(9,115)	(150)
Depreciation and amortization	54,128	53,039	53,663
Oil And Gas [Member]
Segment Reporting Information [Line Items]
Revenue	330,430	386,188	360,275
Income from Operations	(1,323)	14,916	19,862
Depreciation and amortization	51,828	51,345	51,768
ROVs [Member]
Segment Reporting Information [Line Items]
Revenue	85,594	91,584	94,022
Income from Operations	(2,398)	1,056	5,925
Depreciation and amortization	27,642	27,445	29,229
Subsea Products Member
Segment Reporting Information [Line Items]
Revenue	126,688	156,398	150,639
Income from Operations	1,755	11,121	11,483
Depreciation and amortization	14,025	13,437	12,999
Subsea Projects [Member]
Segment Reporting Information [Line Items]
Revenue	56,860	73,376	62,956
Income from Operations	(2,359)	580	187
Depreciation and amortization	8,313	8,127	8,080
Asset Integrity [Member]
Segment Reporting Information [Line Items]
Revenue	61,288	64,830	52,658
Income from Operations	1,679	2,159	2,267
Depreciation and amortization	1,848	2,336	1,460
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Revenue	85,983	97,987	85,901
Income from Operations	1,668	2,779	5,026
Depreciation and amortization	766	794	797
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Income from Operations	(27,494)	(26,810)	(25,038)
Depreciation and amortization	$ 1,534	$ 900	$ 1,098