Helix Energy Solutions (HLX) 10-Q 22 Oct 20 2020 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 16, 2020
Document And Entity Information [Abstract]
Entity Registrant Name	HELIX ENERGY SOLUTIONS GROUP, INC.
Entity Central Index Key	0000866829
Entity File Number	001-32936
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Period End Date	Sep. 30, 2020
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	95-3409686
Entity Address, Address Line One	3505 West Sam Houston Parkway North
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77043
City Area Code	281
Local Phone Number	618–0400
Title of 12(b) Security	Common Stock
Trading Symbol	HLX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		150,160,665

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 259,334	$ 208,431
Restricted cash	0	54,130
Accounts receivable, net of allowance for credit losses of $3,172 and $0, respectively	157,834	125,457
Other current assets	104,117	50,450
Total current assets	521,285	438,468
Property and equipment	2,911,362	2,922,274
Less accumulated depreciation	(1,135,352)	(1,049,637)
Property and equipment, net	1,776,010	1,872,637
Operating lease right-of-use assets	162,052	201,118
Other assets, net	46,127	84,508
Total assets	2,505,474	2,596,731
Current liabilities:
Accounts payable	66,320	69,055
Accrued liabilities	84,657	62,389
Current maturities of long-term debt	73,401	99,731
Current operating lease liabilities	52,160	53,785
Total current liabilities	276,538	284,960
Long-term debt	283,545	306,122
Operating lease liabilities	112,957	151,827
Deferred tax liabilities	118,411	112,132
Other non-current liabilities	4,958	38,644
Total liabilities	796,409	893,685
Redeemable noncontrolling interests	3,579	3,455
Shareholders’ equity:
Common stock, no par, 240,000 shares authorized, 150,136 and 148,888 shares issued, respectively	1,325,520	1,318,961
Retained earnings	460,478	445,370
Accumulated other comprehensive loss	(80,512)	(64,740)
Total shareholders’ equity	1,705,486	1,699,591
Total liabilities, redeemable noncontrolling interests and shareholders’ equity	$ 2,505,474	$ 2,596,731

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Allowance for uncollectible accounts	$ 3,172	$ 0
Shareholders’ equity:
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	150,136,000	148,888,000

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net revenues	$ 193,490	$ 212,609	$ 573,658	$ 581,160
Cost of sales	158,862	157,535	507,444	469,898
Gross profit	34,628	55,074	66,214	111,262
Gain on disposition of assets, net	440	0	913	0
Goodwill impairment	0	0	(6,689)	0
Selling, general and administrative expenses	(16,053)	(16,076)	(48,256)	(48,923)
Income from operations	19,015	38,998	12,182	62,339
Equity in losses of investment	(11)	(13)	(33)	(82)
Net interest expense	(7,598)	(1,901)	(20,407)	(6,204)
Gain (loss) on extinguishment of long-term debt	9,239	0	9,239	(18)
Other income (expense), net	8,824	(2,285)	(3,672)	(2,430)
Royalty income and other	208	362	2,526	2,897
Income (loss) before income taxes	29,677	35,161	(165)	56,502
Income tax provision (benefit)	5,232	3,539	(16,132)	6,739
Net income	24,445	31,622	15,967	49,763
Net loss attributable to redeemable noncontrolling interests	(54)	(73)	(2,044)	(104)
Net income attributable to common shareholders	$ 24,499	$ 31,695	$ 18,011	$ 49,867
Earnings per share of common stock (in dollars per share)
Basic	$ 0.16	$ 0.21	$ 0.10	$ 0.33
Diluted	$ 0.16	$ 0.21	$ 0.10	$ 0.33
Weighted average common shares outstanding (in shares)
Basic	149,032	147,575	148,956	147,506
Diluted	149,951	148,354	149,824	148,086

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 24,445	$ 31,622	$ 15,967	$ 49,763
Other comprehensive income, net of tax:
Net unrealized loss on hedges arising during the period	0	(274)	(95)	(701)
Reclassifications into earnings	0	1,046	452	4,867
Income taxes on hedges	0	(156)	(72)	(838)
Net change in hedges, net of tax	0	616	285	3,328
Foreign currency translation gain (loss)	19,426	(4,301)	(16,057)	(4,564)
Other comprehensive income (loss), net of tax	19,426	(3,685)	(15,772)	(1,236)
Comprehensive income	43,871	27,937	195	48,527
Less comprehensive income (loss) attributable to redeemable noncontrolling interests:
Net loss	(54)	(73)	(2,044)	(104)
Foreign currency translation gain (loss)	133	(78)	(115)	(78)
Comprehensive gain (loss) attributable to redeemable noncontrolling interests	79	(151)	(2,159)	(182)
Comprehensive income attributable to common shareholders	$ 43,792	$ 28,088	$ 2,354	$ 48,709

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2018	$ 1,617,779	$ 1,308,709	$ 383,034	$ (73,964)
Balance, beginning of period (in shares) at Dec. 31, 2018		148,203
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	49,867		49,867
Reclassification of deferred gain from sale and leaseback transaction to retained earnings	4,560		4,560
Foreign currency translation adjustments	(4,564)			(4,564)
Unrealized gain on hedges, net of tax	3,328			3,328
Accretion of redeemable noncontrolling interests	(43)		(43)
Activity in company stock plans, net and other	(765)	$ (765)
Activity in company stock plans, net and other (in shares)		599
Share-based compensation	8,861	$ 8,861
Balance, end of period at Sep. 30, 2019	1,679,023	$ 1,316,805	437,418	(75,200)
Balance, end of period (in shares) at Sep. 30, 2019		148,802
Balance, beginning of period at Jun. 30, 2019	1,648,396	$ 1,314,163	405,748	(71,515)
Balance, beginning of period (in shares) at Jun. 30, 2019		148,759
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	31,695		31,695
Foreign currency translation adjustments	(4,301)			(4,301)
Unrealized gain on hedges, net of tax	616			616
Accretion of redeemable noncontrolling interests	(25)		(25)
Activity in company stock plans, net and other	214	$ 214
Activity in company stock plans, net and other (in shares)		43
Share-based compensation	2,428	$ 2,428
Balance, end of period at Sep. 30, 2019	1,679,023	$ 1,316,805	437,418	(75,200)
Balance, end of period (in shares) at Sep. 30, 2019		148,802
Balance, beginning of period at Dec. 31, 2019	1,699,591	$ 1,318,961	445,370	(64,740)
Balance, beginning of period (in shares) at Dec. 31, 2019		148,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	18,011		18,011
Expected credit losses recognized in retained earnings upon adoption of ASU 2016-13	(620)		(620)
Foreign currency translation adjustments	(16,057)			(16,057)
Unrealized gain on hedges, net of tax	285			285
Accretion of redeemable noncontrolling interests	(2,283)		(2,283)
Equity component of convertible senior notes	33,336	$ 33,336
Re-acquisition of equity component of convertible senior notes	(18,006)	(18,006)
Capped call transactions	(10,625)	(10,625)
Activity in company stock plans, net and other	(4,320)	$ (4,320)
Activity in company stock plans, net and other (in shares)		1,248
Share-based compensation	6,174	$ 6,174
Balance, end of period at Sep. 30, 2020	1,705,486	$ 1,325,520	460,478	(80,512)
Balance, end of period (in shares) at Sep. 30, 2020		150,136
Balance, beginning of period at Jun. 30, 2020	1,654,700	$ 1,318,531	436,107	(99,938)
Balance, beginning of period (in shares) at Jun. 30, 2020		150,040
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	24,499		24,499
Foreign currency translation adjustments	19,426			19,426
Unrealized gain on hedges, net of tax	0
Accretion of redeemable noncontrolling interests	(128)		(128)
Equity component of convertible senior notes	33,336	$ 33,336
Re-acquisition of equity component of convertible senior notes	(18,006)	(18,006)
Capped call transactions	(10,625)	(10,625)
Activity in company stock plans, net and other	193	$ 193
Activity in company stock plans, net and other (in shares)		96
Share-based compensation	2,091	$ 2,091
Balance, end of period at Sep. 30, 2020	$ 1,705,486	$ 1,325,520	$ 460,478	$ (80,512)
Balance, end of period (in shares) at Sep. 30, 2020		150,136

Redeemable Noncontrolling Inter

Redeemable Noncontrolling Interests (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Balance, beginning of period	$ 3,372	$ 3,383	$ 3,455	$ 0
Net loss attributable to redeemable noncontrolling interests	(54)	(73)	(2,044)	(104)
Foreign currency translation adjustments related to redeemable noncontrolling interests	133	(78)	(115)	(78)
Issuance of redeemable noncontrolling interests				3,396
Accretion of redeemable noncontrolling interests	128	25	2,283	43
Balance, end of period	$ 3,579	$ 3,257	$ 3,579	$ 3,257

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement of Cash Flows [Abstract]
Net income	$ 15,967	$ 49,763
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	99,552	84,420
Goodwill impairment	6,689	0
Amortization of debt discounts	5,094	4,642
Amortization of debt issuance costs	2,401	2,752
Share-based compensation	6,394	8,979
Deferred income taxes	3,901	2,347
Equity in losses of investment	33	82
Gain on disposition of assets, net	(913)	0
(Gain) loss on extinguishment of long-term debt	(9,239)	18
Unrealized gain on derivative contracts, net	(601)	(2,351)
Unrealized foreign currency loss	2,891	636
Changes in operating assets and liabilities:
Accounts receivable, net	(35,276)	(45,399)
Income tax receivable	26,342	3,143
Other current assets	(28,036)	12,215
Accounts payable and accrued liabilities	32,042	(15,401)
Other, net	15,929	9,683
Net cash provided by operating activities	58,628	89,877
Cash flows from investing activities:
Capital expenditures	(19,193)	(45,636)
STL acquisition, net	0	(4,081)
Proceeds from sale of assets	938	2,550
Net cash used in investing activities	(18,255)	(47,167)
Cash flows from financing activities:
Proceeds from convertible senior notes	200,000	0
Repayment of convertible senior notes	(183,150)	0
Proceeds from term loan	0	35,000
Repayment of term loans	(2,625)	(34,567)
Repayment of Nordea Q5000 Loan	(26,786)	(26,786)
Repayment of MARAD Debt	(7,200)	(6,858)
Capped call transactions	(10,625)	0
Debt issuance costs	(7,075)	(1,544)
Payments related to tax withholding for share-based compensation	(5,161)	(1,345)
Proceeds from issuance of ESPP shares	622	462
Net cash used in financing activities	(42,000)	(35,638)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(1,600)	(191)
Net increase (decrease) in cash and cash equivalents and restricted cash	(3,227)	6,881
Cash and cash equivalents and restricted cash:
Balance, beginning of year	262,561	279,459
Balance, end of period	$ 259,334	$ 286,340

Basis Of Presentation And New A

Basis Of Presentation And New Accounting Standards	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation And New Accounting Standards	Basis of Presentation and New Accounting Standards The accompanying condensed consolidated financial statements include the accounts of Helix Energy Solutions Group, Inc. and its subsidiaries (collectively, “Helix”). Unless the context indicates otherwise, the terms “we,” “us” and “our” in this report refer collectively to Helix and its subsidiaries. All material intercompany accounts and transactions have been eliminated. These unaudited condensed consolidated financial statements have been prepared pursuant to instructions for the Quarterly Report on Form 10-Q required to be filed with the Securities and Exchange Commission (the “SEC”) and do not include all information and footnotes normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The accompanying condensed consolidated financial statements have been prepared in conformity with GAAP in U.S. dollars and are consistent in all material respects with those applied in our 2019 Annual Report on Form 10-K (our “2019 Form 10-K”) with the exception of the impact of adopting the new credit loss accounting standard in 2020 (see below). The preparation of these financial statements requires us to make estimates and judgments that affect the amounts reported in the financial statements and the related disclosures. Actual results may differ from our estimates. We have made all adjustments, which, unless otherwise disclosed, are of normal recurring nature, that we believe are necessary for a fair presentation of the condensed consolidated balance sheets, statements of operations, statements of comprehensive income and statements of cash flows, as applicable. The operating results for the three- and nine-month periods ended September 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. Our balance sheet as of December 31, 2019 included herein has been derived from the audited balance sheet as of December 31, 2019 included in our 2019 Form 10-K. These unaudited condensed consolidated financial statements should be read in conjunction with the annual audited consolidated financial statements and notes thereto included in our 2019 Form 10-K. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current presentation format. COVID-19 Beginning in the first quarter 2020, the COVID-19 pandemic led to worldwide shutdowns and halting of commercial and interpersonal activity, as governments around the world imposed regulations in efforts to control the spread of COVID-19 such as shelter-in-place orders, quarantines, executive orders and similar restrictions. As a result, the global economy has been marked by significant slowdown and uncertainty, which has resulted in a decline in oil prices in response to demand concerns and global storage considerations. Lower oil prices have resulted in a significantly weaker outlook for oil and gas producers, many of which have cut their capital and operating budgets for 2020 and beyond. Our financial statements for the three- and nine-month periods ended September 30, 2020 reflect the impact of these events and current market conditions, which include reduced utilization on our vessels due to customers deferring work, increased operating costs related to the current environment, our recognition of goodwill impairment losses (Note 6) and tax benefits resulting from the U.S. Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) (Note 8). The continued spread of, or failure to contain, COVID-19 or continued oil price volatility could result in further adverse impact on our results of operations, cash flows and financial position, including further asset impairments. New accounting standards adopted In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” which was updated by subsequent amendments. This ASU replaces the current incurred loss model for measurement of credit losses on financial assets (including trade receivables) with a forward-looking expected loss model based on historical experience, current conditions, and reasonable and supportable forecasts. The guidance became effective for us as of January 1, 2020 and resulted in the recognition of $0.6 million (net of deferred taxes of $0.2 million) of allowances for expected credit losses related to our accounts receivable through a cumulative effect offset to retained earnings. The new credit loss standard is expected to accelerate recognition of credit losses on our accounts receivable. See Note 17 for additional information regarding allowance for credit losses on our accounts receivable. New accounting standards issued but not yet effective In August 2020, the FASB issued ASU No. 2020-06, “Accounting for Convertible Instruments and Contracts in an Entity's Own Equity,” which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, this ASU removes from GAAP the liability and equity separation model for convertible instruments with conversion features that are not required to be bifurcated as a derivative under ASC Topic 815, Derivatives and Hedging, or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost and a convertible preferred stock will be accounted for as a single equity instrument measured at its historical cost, as long as no other features require bifurcation and recognition as derivatives. The embedded conversion feature will no longer be amortized into income as interest expense over the life of the instrument. The adoption of this ASU is expected to increase the net book value of our long-term debt and reduce shareholders’ equity as we reclassify the conversion features associated with our various outstanding convertible senior notes (Note 7). Subsequent to its adoption, the ASU is also expected to reduce our interest expense. Additionally, the ASU no longer permits the treasury stock method and instead requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share (“EPS”). The guidance is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a fully retrospective or modified retrospective basis. We are currently evaluating when to adopt the ASU and the impact it will have on our consolidated financial statements. We do not expect any other new accounting standards to have a material impact on our financial position, results of operations or cash flows when they become effective.

Company Overview

Company Overview	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company Overview	Company Overview We are an international offshore energy services company that provides specialty services to the offshore energy industry, with a focus on well intervention and robotics operations. We provide services and methodologies that we believe are critical to maximizing production economics. Our services cover the lifecycle of an offshore oil or gas field. Our services also include subsea cable burial and seabed clearing services for the offshore renewable energy sector. We provide services primarily in deepwater in the Gulf of Mexico, Brazil, North Sea, Asia Pacific and West Africa regions. Our services are segregated into three reportable business segments: Well Intervention, Robotics and Production Facilities (Note 13). Our Well Intervention segment includes our vessels and/or equipment used to perform well intervention services primarily in the Gulf of Mexico, Brazil, the North Sea and West Africa. Our well intervention vessels include the Q4000 , the Q5000 , the Q7000 , the Seawell , the Well Enhancer , and two chartered monohull vessels, the Siem H elix 1 and the Siem Helix 2 . Our well intervention equipment includes intervention riser systems (“IRSs”) and subsea intervention lubricators (“SILs”), some of which we provide on a stand-alone basis. Our Robotics segment includes remotely operated vehicles (“ROVs”), trenchers and a ROVDrill, which are designed to complement well intervention services and offshore construction to both the oil and gas and the renewable energy markets globally. Our Robotics segment also includes two robotics support vessels under long-term charter, the Grand Canyon II and the Grand Canyon III , as well as spot vessels as needed. Our Production Facilities segment includes the Helix Producer I (the “ HP I ”), a ship-shaped dynamically positioned floating production vessel, the Helix Fast Response System (the “HFRS”), our ownership interest in Independence Hub, LLC (“Independence Hub”) (Note 4), and our ownership of oil and gas properties. All of our current production facilities activities are located in the Gulf of Mexico.

Details Of Certain Accounts

Details Of Certain Accounts	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Details Of Certain Accounts	Details of Certain Accounts Other current assets consist of the following (in thousands): September 30, December 31, Contract assets (Note 10) $ 1,883 $ 740 Prepaids 17,949 12,635 Deferred costs (Note 10) 22,857 28,340 Income tax receivable 25,493 1,261 Other receivable (1) 29,180 — Other 6,755 7,474 Total other current assets $ 104,117 $ 50,450 (1) Agreed-upon amounts to be paid to us by Marathon Oil Corporation (“Marathon Oil”) as the required plug and abandonment (“P&A”) work associated with our Droshky oil and gas properties is completed (Note 14). Other assets, net consist of the following (in thousands): September 30, December 31, Prepaids $ 527 $ 777 Deferred recertification and dry dock costs, net 24,030 16,065 Deferred costs (Note 10) 3,284 14,531 Charter deposit (1) 12,544 12,544 Other receivable (2) — 27,264 Goodwill (Note 6) — 7,157 Intangible assets with finite lives, net 3,716 3,847 Other 2,026 2,323 Total other assets, net $ 46,127 $ 84,508 (1) This amount is deposited with the owner of the Siem Helix 2 to offset certain payment obligations associated with the vessel at the end of the charter term. (2) Agreed-upon amounts to be paid to us by Marathon Oil as the required P&A work associated with our Droshky oil and gas properties is completed (Note 14). Accrued liabilities consist of the following (in thousands): September 30, December 31, Accrued payroll and related benefits $ 26,315 $ 31,417 Investee losses in excess of investment (Note 4) 1,940 4,069 Deferred revenue (Note 10) 9,795 11,568 Asset retirement obligations (Note 14) 30,279 — Derivative liability (Note 19) — 1,002 Other 16,328 14,333 Total accrued liabilities $ 84,657 $ 62,389 Other non-current liabilities consist of the following (in thousands): September 30, December 31, Deferred revenue (Note 10) $ 2,976 $ 8,286 Asset retirement obligations (Note 14) — 28,258 Other 1,982 2,100 Total other non-current liabilities $ 4,958 $ 38,644

Equity Method Investments

Equity Method Investments	9 Months Ended
	Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Equity Method Investments We have a 20% ownership interest in Independence Hub that we account for using the equity method of accounting. Independence Hub owns the “Independence Hub” platform, which is nearing completion of its decommissioning. The remaining liability balances for our share of Independence Hub’s estimated obligations, net of remaining working capital, were $1.9 million at September 30, 2020 and $4.1 million at December 31, 2019.

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	Leases We charter vessels and lease facilities and equipment under non-cancelable contracts that expire on various dates through 2031. We also sublease some of our facilities under non-cancelable sublease agreements. The following table details the components of our lease cost (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Operating lease cost $ 16,132 $ 18,002 $ 48,561 $ 54,191 Variable lease cost 4,204 3,630 11,256 9,927 Short-term lease cost 12,923 5,587 30,089 14,549 Sublease income (344) (351) (951) (1,077) Net lease cost $ 32,915 $ 26,868 $ 88,955 $ 77,590 Maturities of our operating lease liabilities as of September 30, 2020 are as follows (in thousands): Vessels Facilities and Equipment Total Remainder of 2020 $ 15,018 $ 1,532 $ 16,550 2021 54,421 5,646 60,067 2022 52,106 5,135 57,241 2023 34,580 4,598 39,178 2024 2,470 4,328 6,798 Thereafter — 6,125 6,125 Total lease payments $ 158,595 $ 27,364 $ 185,959 Less: imputed interest (15,896) (4,946) (20,842) Total operating lease liabilities $ 142,699 $ 22,418 $ 165,117 Current operating lease liabilities $ 47,552 $ 4,608 $ 52,160 Non-current operating lease liabilities 95,147 17,810 112,957 Total operating lease liabilities $ 142,699 $ 22,418 $ 165,117 Maturities of our operating lease liabilities as of December 31, 2019 are as follows (in thousands): Vessels Facilities and Equipment Total 2020 $ 60,210 $ 6,610 $ 66,820 2021 54,564 5,888 60,452 2022 52,106 5,257 57,363 2023 34,580 4,622 39,202 2024 2,470 4,349 6,819 Thereafter — 6,251 6,251 Total lease payments $ 203,930 $ 32,977 $ 236,907 Less: imputed interest (24,846) (6,449) (31,295) Total operating lease liabilities $ 179,084 $ 26,528 $ 205,612 Current operating lease liabilities $ 48,716 $ 5,069 $ 53,785 Non-current operating lease liabilities 130,368 21,459 151,827 Total operating lease liabilities $ 179,084 $ 26,528 $ 205,612 The following table presents the weighted average remaining lease term and discount rate: September 30, December 31, Weighted average remaining lease term 3.3 years 4.0 years Weighted average discount rate 7.53 % 7.54 % The following table presents other information related to our operating leases (in thousands): Nine Months Ended 2020 2019 Cash paid for operating lease liabilities $ 49,350 $ 54,538 ROU assets obtained in exchange for new operating lease obligations 36 921

Business Combinations And Goodw

Business Combinations And Goodwill	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Business Combinations And Goodwill	Business Combinations and Goodwill In May 2019, we acquired a 70% controlling interest in Subsea Technologies Group Limited (“STL”), a subsea engineering firm based in Aberdeen, Scotland, for $5.1 million. The holders of the remaining 30% noncontrolling interest currently have the right to put their shares to us in June 2024. These redeemable noncontrolling interests have been recognized as temporary equity. STL is included in our Well Intervention segment (Note 13) and its revenue and earnings are immaterial to our consolidated results. As a result of the decline in oil prices as well as energy and energy services valuations during the first quarter 2020 due to the ongoing COVID-19 pandemic and the price war among members of the Organization of Petroleum Exporting Countries (“OPEC”) and other non-OPEC producer nations (collectively with OPEC members, “OPEC+”) during the first quarter 2020, we identified that it was more likely than not that the fair value of goodwill associated with our STL acquisition was less than its carrying amount. Based on the result of our goodwill impairment test as of March 31, 2020, we recorded a charge to write off the carrying amount of the goodwill. The fair value of the reporting unit used to determine the impairment was estimated using a discounted cash flow approach. The changes in the carrying amount of goodwill are as follows (in thousands): Well Intervention Balance at December 31, 2019 $ 7,157 Impairment loss (6,689) Other adjustments (1) (468) Balance at September 30, 2020 $ — (1) Relates to foreign currency adjustments.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Long-term Debt	Long-Term Debt Scheduled maturities of our long-term debt outstanding as of September 30, 2020 are as follows (in thousands): Term Loan (1) 2022 2023 2026 MARAD Nordea Total Less than one year $ 3,500 $ — $ — $ — $ 7,560 $ 62,500 $ 73,560 One to two years 27,125 35,000 — — 7,937 — 70,062 Two to three years — — 30,000 — 8,333 — 38,333 Three to four years — — — — 8,749 — 8,749 Four to five years — — — — 9,186 — 9,186 Over five years — — — 200,000 14,645 — 214,645 Gross debt 30,625 35,000 30,000 200,000 56,410 62,500 414,535 Unamortized debt discounts (2) — (1,560) (2,869) (43,133) — — (47,562) Unamortized debt issuance costs (3) (239) (235) (462) (5,761) (3,171) (159) (10,027) Total debt 30,386 33,205 26,669 151,106 53,239 62,341 356,946 Less: current maturities (3,500) — — — (7,560) (62,341) (73,401) Long-term debt $ 26,886 $ 33,205 $ 26,669 $ 151,106 $ 45,679 $ — $ 283,545 (1) Term Loan pursuant to the Credit Agreement (as defined below) matures in December 2021. (2) Convertible Senior Notes due 2022, 2023 and 2026 will increase to their face amounts through accretion of their debt discounts to interest expense through May 2022, September 2023 and February 2026, respectively. (3) Debt issuance costs are amortized to interest expense over the term of the applicable debt agreement. Below is a summary of certain components of our indebtedness: Credit Agreement We have a credit agreement (and the amendments made thereafter, collectively the “Credit Agreement”) with a group of lenders led by Bank of America, N.A. (“Bank of America”). The Credit Agreement is comprised of a Term Loan with a remaining balance of $30.6 million as of September 30, 2020 and a Revolving Credit Facility with a maximum availability of $175 million that matures on December 31, 2021. The Revolving Credit Facility permits us to obtain letters of credit up to a sublimit of $25 million. Pursuant to the Credit Agreement, subject to existing lender participation and/or the participation of new lenders, and subject to standard conditions precedent, we may request aggregate commitments of up to $100 million with respect to an increase in the Revolving Credit Facility. As of September 30, 2020, we had no borrowings under the Revolving Credit Facility, and our available borrowing capacity under that facility, based on the leverage ratios, totaled $144.7 million, net of $3.4 million of letters of credit issued under that facility. Borrowings under the Credit Agreement bear interest, at our election, at either Bank of America’s base rate, the LIBOR or a comparable successor rate, or a combination thereof. The Term Loan bearing interest at the base rate will bear interest at a per annum rate equal to Bank of America’s base rate plus a margin of 2.25%. The Term Loan bearing interest at a LIBOR rate will bear interest per annum at the LIBOR or a comparable successor rate selected by us plus a margin of 3.25%. The interest rate on the Term Loan was 3.40% as of September 30, 2020. Borrowings under the Revolving Credit Facility bearing interest at the base rate will bear interest at a per annum rate equal to Bank of America’s base rate plus a margin ranging from 1.50% to 2.50%. Borrowings under the Revolving Credit Facility bearing interest at a LIBOR rate will bear interest per annum at the LIBOR or a comparable successor rate selected by us plus a margin ranging from 2.50% to 3.50%. A letter of credit fee is payable by us equal to the applicable margin for LIBOR rate loans multiplied by the daily amount available to be drawn under the applicable letter of credit. Margins on borrowings under the Revolving Credit Facility will vary in relation to the Consolidated Total Leverage Ratio (as defined below) as provided for in the Credit Agreement. We also pay a fixed commitment fee of 0.50% per annum on the unused portion of the Revolving Credit Facility. The Term Loan principal is required to be repaid in quarterly installments of 2.5% of its aggregate principal amount, with a balloon payment at maturity. Installments are subject to adjustment for any prepayments. We may prepay indebtedness outstanding under the Term Loan without premium or penalty, but may not reborrow any amounts prepaid. We may prepay indebtedness outstanding under the Revolving Credit Facility without premium or penalty, and may reborrow any amounts prepaid up to the amount available under the Revolving Credit Facility. Our obligations under the Credit Agreement, and those of our subsidiary guarantors under their guarantee, are secured by (i) most of the assets of the parent company, (ii) the shares of our domestic subsidiaries (other than Cal Dive I - Title XI, Inc.) and of Helix Robotics Solutions Limited and (iii) most of the assets of our domestic subsidiaries (other than Cal Dive I - Title XI, Inc.) and of Helix Robotics Solutions Limited. In addition, these obligations are secured by pledges of up to 66% of the shares of certain foreign subsidiaries (restricted subsidiaries). The Credit Agreement and the other documents entered into in connection with the Credit Agreement include terms and conditions, including covenants, that we consider customary for this type of transaction. The covenants include certain restrictions on our and certain of our subsidiaries’ ability to grant liens, incur indebtedness, make investments, merge or consolidate, sell or transfer assets, pay dividends and make capital expenditures. In addition, the Credit Agreement obligates us to meet minimum ratio requirements of EBITDA to interest charges (Consolidated Interest Coverage Ratio), funded debt to EBITDA (Consolidated Total Leverage Ratio) and secured funded debt to EBITDA (Consolidated Secured Leverage Ratio). We may designate one or more of our new foreign subsidiaries as subsidiaries not generally subject to the covenants in the Credit Agreement (the “Unrestricted Subsidiaries”). The Unrestricted Subsidiaries are not pledged as collateral under the Credit Agreement, and the debt and EBITDA of the Unrestricted Subsidiaries, with the exception of Helix Q5000 Holdings, S.à r.l. (“Q5000 Holdings”), a wholly owned Luxembourg subsidiary of Helix Vessel Finance S.à r.l., are not included in the calculations of our financial covenants except to the extent of any cash actually distributed by such subsidiary to Helix. Convertible Senior Notes Due 2022 (“2022 Notes”) The 2022 Notes bear interest at a rate of 4.25% per annum and are payable semi-annually in arrears on November 1 and May 1 of each year, beginning on May 1, 2017. The 2022 Notes mature on May 1, 2022 unless earlier converted, redeemed or repurchased. During certain periods and subject to certain conditions, the 2022 Notes are convertible by the holders into shares of our common stock at an initial conversion rate of 71.9748 shares of our common stock per $1,000 principal amount (which represents an initial conversion price of approximately $13.89 per share of common stock), subject to adjustment in certain circumstances. We have the right and the intention to settle the principal amount of any such future conversions in cash. Prior to November 1, 2019, the 2022 Notes were not redeemable. Beginning November 1, 2019, if certain conditions are met, we may redeem all or any portion of the 2022 Notes at a redemption price payable in cash equal to 100% of the principal amount to be redeemed plus accrued and unpaid interest and a “make-whole premium” (as defined in the indenture governing the 2022 Notes). Holders of the 2022 Notes may require us to repurchase the notes following a “fundamental change” (as defined in the indenture governing the 2022 Notes). The indenture governing the 2022 Notes contains customary terms and covenants, including that upon certain events of default occurring and continuing, either the trustee under the indenture or the holders of not less than 25% in aggregate principal amount then outstanding under the 2022 Notes may declare the entire principal amount of all the notes, and the interest accrued on such notes, if any, to be immediately due and payable. In the case of certain events of bankruptcy, insolvency or reorganization relating to us or a subsidiary, the principal amount of the 2022 Notes together with any accrued and unpaid interest thereon will become immediately due and payable. The 2022 Notes were initially separated between the equity component recognized in shareholders’ equity and the debt component, which is presented as long-term debt, net of the unamortized debt discount and debt issuance costs. On August 14, 2020, we repurchased $90 million in aggregate principal amount of the 2022 Notes for $89.1 million. We applied $81.7 million of the repurchase price to the acquisition of the debt component of the 2022 Notes and recognized a gain of $3.3 million. The remaining unamortized debt discount of the 2022 Notes was $1.6 million at September 30, 2020 and $8.0 million at December 31, 2019. We applied the remaining $7.4 million of the repurchase price to the re-acquisition of the equity component. The remaining equity component of the 2022 Notes was $9.5 million ($5.3 million net of tax) at September 30, 2020 and $16.9 million ($11.0 million net of tax) at December 31, 2019. The effective interest rate for the 2022 Notes is 7.3% after considering the effect of the accretion of the related debt discount over the term of the 2022 Notes. For the three- and nine-month periods ended September 30, 2020, interest expense (including amortization of the debt discount) related to the 2022 Notes totaled $1.3 million and $5.6 million, respectively. For the three- and nine-month periods ended September 30, 2019, interest expense (including amortization of the debt discount) related to the 2022 Notes totaled $2.1 million and $6.2 million, respectively. Convertible Senior Notes Due 2023 (“2023 Notes”) The 2023 Notes bear interest at a rate of 4.125% per annum and are payable semi-annually in arrears on March 15 and September 15 of each year, beginning on September 15, 2018. The 2023 Notes mature on September 15, 2023 unless earlier converted, redeemed or repurchased. During certain periods and subject to certain conditions, the 2023 Notes are convertible by the holders into shares of our common stock at an initial conversion rate of 105.6133 shares of our common stock per $1,000 principal amount (which represents an initial conversion price of approximately $9.47 per share of common stock), subject to adjustment in certain circumstances. We have the right and the intention to settle the principal amount of any such future conversions in cash. Prior to March 15, 2021, the 2023 Notes are not redeemable. On or after March 15, 2021, if certain conditions are met, we may redeem all or any portion of the 2023 Notes at a redemption price payable in cash equal to 100% of the principal amount to be redeemed plus accrued and unpaid interest and a “make-whole premium” (as defined in the indenture governing the 2023 Notes). Holders of the 2023 Notes may require us to repurchase the notes following a “fundamental change” (as defined in the indenture governing the 2023 Notes). The indenture governing the 2023 Notes contains customary terms and covenants, including that upon certain events of default occurring and continuing, either the trustee under the indenture or the holders of not less than 25% in aggregate principal amount then outstanding under the 2023 Notes may declare the entire principal amount of all the notes, and the interest accrued on such notes, if any, to be immediately due and payable. In the case of certain events of bankruptcy, insolvency or reorganization relating to us or a significant subsidiary, the principal amount of the 2023 Notes together with any accrued and unpaid interest thereon will become immediately due and payable. The 2023 Notes were initially separated between the equity component recognized in shareholders’ equity and the debt component, which is presented as long-term debt, net of the unamortized debt discount and debt issuance costs. On August 14, 2020, we repurchased $95 million in aggregate principal amount of the 2023 Notes for $94.1 million. We applied $78.2 million of the repurchase price to the re-acquisition of the debt component of the 2023 Notes and recognized a gain of $5.9 million. The remaining unamortized debt discount of the 2023 Notes was $2.9 million at September 30, 2020 and $14.5 million at December 31, 2019. We applied the remaining $15.9 million of the repurchase price to the re-acquisition of the equity component. The remaining equity component of the 2023 Notes was $4.2 million ($3.6 million net of tax) at September 30, 2020 and $20.1 million ($15.9 million net of tax) at December 31, 2019. The effective interest rate for the 2023 Notes is 7.8% after considering the effect of the accretion of the related debt discount over the term of the 2023 Notes. For the three- and nine-month periods ended September 30, 2020, interest expense (including amortization of the debt discount) related to the 2023 Notes totaled $1.3 million and $5.6 million, respectively. For the three- and nine-month periods ended September 30, 2019, interest expense (including amortization of the debt discount) related to the 2023 Notes totaled $2.1 million and $6.3 million, respectively. Convertible Senior Notes Due 2026 (“2026 Notes”) On August 14, 2020, we issued $200 million in aggregate principal amount of the 2026 Notes. The net proceeds from the issuance of the 2026 Notes were approximately $192.5 million, after deducting the underwriting discounts and commissions and estimated offering expenses. As discussed further in Note 9, we used approximately $10.5 million of the net proceeds to enter into privately negotiated capped call transactions in connection with the issuance of the 2026 Notes. We used approximately $183.2 million, consisting of the remainder of the net proceeds, together with cash on hand, to repurchase $90 million in aggregate principal amount of the 2022 Notes and $95 million in aggregate principal amount of the 2023 Notes (see “Convertible Senior Notes Due 2022” and “Convertible Senior Notes Due 2023” above) in privately negotiated transactions. The 2026 Notes bear interest at a rate of 6.75% per annum and are payable semi-annually in arrears on February 15 and August 15 of each year, beginning on February 15, 2021. The 2026 Notes mature on February 15, 2026 unless earlier converted, redeemed or repurchased. During certain periods and subject to certain conditions, the 2026 Notes are convertible by the holders into shares of our common stock at an initial conversion rate of 143.3795 shares of our common stock per $1,000 principal amount (which represents an initial conversion price of approximately $6.97 per share of common stock), subject to adjustment in certain circumstances. We have the right and the intention to settle the principal amount of any such future conversions in cash. Prior to August 15, 2023, the 2026 Notes are not redeemable. On or after August 15, 2023, if certain conditions are met, we may redeem all or any portion of the 2026 Notes at a redemption price payable in cash equal to 100% of the principal amount to be redeemed plus accrued and unpaid interest and a “make-whole premium” (as defined in the indenture governing the 2026 Notes). Holders of the 2026 Notes may require us to repurchase the notes following a “fundamental change” (as defined in the indenture governing the 2026 Notes). The indenture governing the 2026 Notes contains customary terms and covenants, including that upon certain events of default occurring and continuing, either the trustee under the indenture or the holders of not less than 25% in aggregate principal amount then outstanding under the 2026 Notes may declare the entire principal amount of all the notes, and the interest accrued on such notes, if any, to be immediately due and payable. In the case of certain events of bankruptcy, insolvency or reorganization relating to us or a significant subsidiary, the principal amount of the 2026 Notes together with any accrued and unpaid interest thereon will become immediately due and payable. The 2026 Notes are separated between the equity component of $43.8 million ($34.6 million net of tax) recognized in shareholders’ equity and the debt component which is presented as long-term debt, net of the unamortized debt discount and debt issuance costs. The effective interest rate for the 2026 Notes is 12.4% after considering the effect of the accretion of the related debt discount over the term of the 2026 Notes. For each of the three- and nine-month periods ended September 30, 2020, interest expense (including amortization of the debt discount) related to the 2026 Notes was $2.4 million. The remaining unamortized debt discount of the 2026 Notes was $43.1 million at September 30, 2020. MARAD Debt This U.S. government-guaranteed financing (the “MARAD Debt”), pursuant to Title XI of the Merchant Marine Act of 1936 administered by the Maritime Administration, was used to finance the construction of the Q4000 . The MARAD Debt is collateralized by the Q4000 and is guaranteed 50% by us. The MARAD Debt is payable in equal semi-annual installments, matures in February 2027 and bears interest at a rate of 4.93%. Nordea Credit Agreement In September 2014, Q5000 Holdings entered into a credit agreement (the “Nordea Credit Agreement”) with a syndicated bank lending group for a term loan (the “Nordea Q5000 Loan”) in an amount of up to $250 million. The Nordea Q5000 Loan was funded in the amount of $250 million in April 2015 at the time the Q5000 was delivered to us. Helix Vessel Finance S.à r.l., Q5000 Holdings's parent, which is a direct wholly owned Luxembourg subsidiary of Helix, guaranteed the Nordea Q5000 Loan. The loan is secured by the Q5000 and its charter earnings as well as by a pledge of the shares of Q5000 Holdings. This indebtedness is non-recourse to Helix. We amended the Nordea Credit Agreement on March 11, 2020. Prior to the amendment, the Nordea Q5000 Loan incurred interest at a LIBOR rate plus a margin of 2.5% and was repayable in scheduled quarterly principal installments of $8.9 million with a balloon payment of $80.4 million on April 30, 2020. The amendment increases the margin to 2.75%, maintains the existing quarterly amortization requirements, and extends the final maturity to January 31, 2021 with a balloon payment on that date of $53.6 million. The remaining principal balance and unamortized debt issuance costs related to the Nordea Q5000 Loan are classified as current in the accompanying condensed consolidated balance sheets. We may elect to prepay indebtedness outstanding under the Nordea Q5000 Loan without premium or penalty, but may not reborrow any amounts prepaid. Quarterly principal installments are subject to adjustment for any prepayments on this debt. The Nordea Credit Agreement and related loan documents include terms and conditions, including covenants and prepayment requirements, that we consider customary for this type of transaction. The covenants include restrictions on Q5000 Holdings’s ability to grant liens, incur indebtedness, make investments, merge or consolidate, sell or transfer assets, and pay dividends. In addition, the Nordea Credit Agreement obligates Q5000 Holdings to meet certain minimum financial requirements, including liquidity, consolidated debt service coverage and collateral maintenance. Other In accordance with the Credit Agreement, the 2022 Notes, the 2023 Notes, the 2026 Notes, the MARAD Debt agreements and the Nordea Credit Agreement, we are required to comply with certain covenants, including with respect to the Credit Agreement, certain financial ratios such as a consolidated interest coverage ratio, a consolidated total leverage ratio and a consolidated secured leverage ratio, as well as the maintenance of minimum cash balance, net worth, working capital and debt-to-equity requirements. As of September 30, 2020, we were in compliance with these covenants. The following table details the components of our net interest expense (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Interest expense $ 8,007 $ 7,694 $ 22,580 $ 23,635 Interest income (409) (652) (991) (2,085) Capitalized interest — (5,141) (1,182) (15,346) Net interest expense $ 7,598 $ 1,901 $ 20,407 $ 6,204

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We believe that our recorded deferred tax assets and liabilities are reasonable. However, tax laws and regulations are subject to interpretation, and the outcomes of tax disputes are inherently uncertain; therefore, our assessments can involve a series of complex judgments about future events and rely heavily on estimates and assumptions. The CARES Act, which was signed into law on March 27, 2020, is an economic stimulus package designed to aid in offsetting the economic damage caused by the ongoing COVID-19 pandemic and includes various changes to U.S. income tax regulations. The CARES Act permits the carryback of certain net operating losses, which previously had been required to be carried forward, at the tax rates applicable in the relevant carryback year. As a result of these changes, we recognized a $7.6 million net tax benefit in the nine-month period ended September 30, 2020, consisting of a $18.9 million current tax benefit and a $11.3 million deferred tax expense. This $7.6 million net tax benefit resulted from our deferred tax assets related to our net operating losses in the U.S. being utilized at the previous higher income tax rate applicable to the carryback periods. During the nine-month period ended September 30, 2020, we migrated two of our foreign subsidiaries into our U.S. consolidated tax group. Subsequent to the migration, these subsidiaries are disregarded and no longer subject to certain branch profits taxes. Consequently, we recognized net deferred tax benefits of $8.3 million due to the reduction in the overall tax rate associated with these subsidiaries. Our estimated annual effective tax rate, adjusted for discrete tax items, is applied to our near break-even pre-tax loss for the nine-month period ended September 30, 2020 as we have determined that a return to the annualized effective tax rate method is appropriate. Income taxes are provided based on the U.S. statutory rate and the local statutory rate for each foreign jurisdiction adjusted for items that are required for federal and foreign income tax reporting purposes. The effective tax rates for the three-month periods ended September 30, 2020 and 2019 were 17.6% and 10.1%, respectively. The variance was primarily attributable to the earnings mix between our higher and lower tax rate jurisdictions as well as our carrying back certain net operating losses to prior periods with higher income tax rates. The effective tax rate for the nine-month period ended September 30, 2020 was significantly higher than the U.S. statutory rate primarily due to our recognition of discrete benefits during the period related to the restructuring of certain foreign subsidiaries and our carrying back certain net operating losses to prior periods with higher income tax rates under tax law changes associated with the CARES Act whereas we had only nominal pre-tax losses. The effective tax rate for the nine-month period ended September 30, 2019 was lower than the U.S. statutory rate primarily due to a significant portion of our earnings being generated in certain jurisdictions with lower tax rates. The primary differences between the income tax provision (benefit) at the U.S. statutory rate and our actual income tax provision (benefit) are as follows (dollars in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Taxes at U.S. statutory rate $ 6,232 21.0 % $ 7,384 21.0 % $ (35) 21.0 % $ 11,866 21.0 % Foreign tax provision 1,088 3.7 (3,574) (10.1) (28) 17.0 (5,488) (9.7) CARES Act (2,362) (8.0) — — (7,596) 4,603.6 — — Subsidiary restructuring — — — — (8,333) 5,050.3 — — Other 274 0.9 (271) (0.8) (140) 85.1 361 0.6 Income tax provision (benefit) $ 5,232 17.6 % $ 3,539 10.1 % $ (16,132) 9,777.0 % $ 6,739 11.9 %

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity The components of accumulated other comprehensive loss (“accumulated OCI”) are as follows (in thousands): September 30, December 31, Cumulative foreign currency translation adjustment $ (80,512) $ (64,455) Net unrealized loss on hedges, net of tax (1) — (285) Accumulated OCI $ (80,512) $ (64,740) (1) Relates to foreign currency hedges for the Grand Canyon III charter as well as interest rate hedge contracts for the Nordea Q5000 Loan (Note 19). In connection with the 2026 Notes offering (Note 7), we entered into capped call transactions with three separate option counterparties (the “2026 Capped Calls”). The 2026 Capped Calls are separate transactions from the 2026 Notes and do not change the holders' rights under the 2026 Notes. Holders of the 2026 Notes do not have any rights with respect to the 2026 Capped Calls. The 2026 Capped Calls are for an aggregate of 28,675,900 shares of our common stock, subject to certain anti-dilution adjustments. Each capped call option has an initial strike price of approximately $6.97 per share, which corresponds to the initial conversion price of the 2026 Notes, and an initial cap price of approximately $8.42 per share. The strike and cap prices are subject to certain adjustments. The 2026 Capped Calls are intended to offset some or all of the potential dilution to Helix common shares caused by any conversion of the 2026 Notes up to the cap price. The 2026 Capped Calls can be settled in either net shares or cash at our option in components commencing December 15, 2025 and ending February 12, 2026, which could be extended under certain circumstances. The 2026 Capped Calls are subject to either adjustment or termination upon the occurrence of specified extraordinary events affecting Helix, including a merger, tender offer, nationalization, insolvency or delisting. In addition, certain events may result in a termination of the 2026 Capped Calls, including changes in law, insolvency filings and hedging disruptions. The 2026 Capped Calls are recorded at their aggregate cost of $10.6 million as a reduction to common stock in the shareholders’ equity section of our condensed consolidated balance sheet.

Revenue From Contracts With Cus

Revenue From Contracts With Customers	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue From Contracts With Customers	Revenue from Contracts with Customers Disaggregation of Revenue Our revenues are derived from short-term and long-term service contracts with customers. Our service contracts generally contain either provisions for specific time, material and equipment charges that are billed in accordance with the terms of such contracts (dayrate contracts) or lump sum payment provisions (lump sum contracts). We record revenues net of taxes collected from customers and remitted to governmental authorities. Contracts are classified as long-term if all or part of the contract is to be performed over a period extending beyond 12 months from the effective date of the contract. Long-term contracts may include multi-year agreements whereby the commitment for services in any one year may be short in duration. The following table provides information about disaggregated revenue by contract duration (in thousands): Well Intervention Robotics Production Facilities Intercompany Eliminations (1) Total Revenue Three months ended September 30, 2020 Short-term $ 46,907 $ 28,782 $ — $ — $ 75,689 Long-term 93,896 21,020 14,167 (11,282) 117,801 Total $ 140,803 $ 49,802 $ 14,167 $ (11,282) $ 193,490 Three months ended September 30, 2019 Short-term $ 53,018 $ 26,809 $ — $ — $ 79,827 Long-term 117,188 25,100 13,777 (23,283) 132,782 Total $ 170,206 $ 51,909 $ 13,777 $ (23,283) $ 212,609 Nine months ended September 30, 2020 Short-term $ 184,599 $ 87,307 $ — $ — $ 271,906 Long-term 242,697 48,589 43,301 (32,835) 301,752 Total $ 427,296 $ 135,896 $ 43,301 $ (32,835) $ 573,658 Nine months ended September 30, 2019 Short-term $ 145,611 $ 80,440 $ — $ — $ 226,051 Long-term 305,900 55,956 44,651 (51,398) 355,109 Total $ 451,511 $ 136,396 $ 44,651 $ (51,398) $ 581,160 (1) Intercompany revenues among our segments are under agreements that are considered long-term. Contract Balances Accounts receivable are recognized when our right to consideration becomes unconditional. Accounts receivable that have been billed to customers are recorded as trade accounts receivable while accounts receivable that have not been billed to customers are recorded as unbilled accounts receivable. Contract assets are rights to consideration in exchange for services that we have provided to a customer when those rights are conditioned on our future performance. Contract assets generally consist of (i) demobilization fees recognized ratably over the contract term but invoiced upon completion of the demobilization activities and (ii) revenue recognized in excess of the amount billed to the customer for lump sum contracts when the cost-to-cost method of revenue recognition is utilized. Contract assets are reflected in “Other current assets” in the accompanying condensed consolidated balance sheets (Note 3). Contract assets were $1.9 million at September 30, 2020 and $0.7 million at December 31, 2019. We had no impairment losses on our contract assets for the three- and nine-month periods ended September 30, 2020 and 2019. Contract liabilities are obligations to provide future services to a customer for which we have already received, or have the unconditional right to receive, the consideration for those services from the customer. Contract liabilities may consist of (i) advance payments received from customers, including upfront mobilization fees allocated to a single performance obligation and recognized ratably over the contract term and/or (ii) amounts billed to the customer in excess of revenue recognized for lump sum contracts when the cost-to-cost method of revenue recognition is utilized. Contract liabilities are reflected as “Deferred revenue,” a component of “Accrued liabilities” and “Other non-current liabilities” in the accompanying condensed consolidated balance sheets (Note 3). Contract liabilities totaled $12.8 million at September 30, 2020 and $19.9 million at December 31, 2019. Revenue recognized for the three- and nine-month periods ended September 30, 2020 included $3.4 million and $8.8 million, respectively, that were included in the contract liability balance at the beginning of each period. Revenue recognized for the three- and nine-month periods ended September 30, 2019 included $4.0 million and $7.4 million, respectively, that were included in the contract liability balance at the beginning of each period. We report the net contract asset or contract liability position on a contract-by-contract basis at the end of each reporting period. Performance Obligations As of September 30, 2020, $480.6 million related to unsatisfied performance obligations was expected to be recognized as revenue in the future, with $129.6 million in 2020, $247.0 million in 2021 and $104.0 million in 2022 and thereafter. These amounts include fixed consideration and estimated variable consideration for both wholly and partially unsatisfied performance obligations, including mobilization and demobilization fees. These amounts are derived from the specific terms of our contracts, and the expected timing for revenue recognition is based on the estimated start date and duration of each contract according to the information known at September 30, 2020. For the three- and nine-month periods ended September 30, 2020 and 2019, revenues recognized from performance obligations satisfied (or partially satisfied) in previous periods were immaterial. Contract Fulfillment Costs Contract fulfillment costs consist of costs incurred in fulfilling a contract with a customer. Our contract fulfillment costs primarily relate to costs incurred for mobilization of personnel and equipment at the beginning of a contract and costs incurred for demobilization at the end of a contract. Mobilization costs are deferred and amortized ratably over the contract term (including anticipated contract extensions) based on the pattern of the provision of services to which the contract fulfillment costs relate. Demobilization costs are recognized when incurred at the end of the contract. Deferred contract costs are reflected as “Deferred costs,” a component of “Other current assets” and “Other assets, net” in the accompanying condensed consolidated balance sheets (Note 3). Our deferred contract costs totaled $26.1 million at September 30, 2020 and $42.9 million at December 31, 2019. For the three- and nine-month periods ended September 30, 2020, we recorded $9.2 million and $27.2 million, respectively, related to amortization of deferred contract costs existing at the beginning of each period. For the three- and nine-month periods ended September 30, 2019, we recorded $7.7 million and $23.6 million, respectively, related to amortization of deferred contract costs existing at the beginning of each period. There were no associated impairment losses for any period presented. For additional information regarding revenue recognition, see Notes 2 and 12 to our 2019 Form 10-K.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share We have shares of restricted stock issued and outstanding that are currently unvested. Shares of restricted stock are considered participating securities because holders of shares of unvested restricted stock are entitled to the same liquidation and dividend rights as the holders of our unrestricted common stock. We are required to compute basic and diluted EPS under the two-class method in periods in which we have earnings. Under the two-class method, the undistributed earnings for each period are allocated based on the participation rights of both common shareholders and the holders of any participating securities as if earnings for the respective periods had been distributed. Because the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. For periods in which we have a net loss we do not use the two-class method as holders of our restricted shares are not obligated to share in such losses. The presentation of basic EPS on the face of the accompanying condensed consolidated statements of operations is computed by dividing net income or loss by the weighted average shares of our common stock outstanding. The calculation of diluted EPS is similar to that for basic EPS, except that the denominator includes dilutive common stock equivalents and the numerator excludes the effects of dilutive common stock equivalents, if any. The computations of the numerator (income) and denominator (shares) to derive the basic and diluted EPS amounts presented on the face of the accompanying condensed consolidated statements of operations are as follows (in thousands): Three Months Ended Three Months Ended Income Shares Income Shares Basic: Net income attributable to common shareholders $ 24,499 $ 31,695 Less: Undistributed earnings allocated to participating securities (180) (261) Accretion of redeemable noncontrolling interests (128) (25) Net income available to common shareholders, basic $ 24,191 149,032 $ 31,409 147,575 Diluted: Net income available to common shareholders, basic $ 24,191 149,032 $ 31,409 147,575 Effect of dilutive securities: Share-based awards other than participating securities — 919 — 779 Undistributed earnings reallocated to participating securities 2 — 1 — Net income available to common shareholders, diluted $ 24,193 149,951 $ 31,410 148,354 Nine Months Ended Nine Months Ended Income Shares Income Shares Basic: Net income attributable to common shareholders $ 18,011 $ 49,867 Less: Undistributed earnings allocated to participating securities (117) (435) Accretion of redeemable noncontrolling interests (2,283) (43) Net income available to common shareholders, basic $ 15,611 148,956 $ 49,389 147,506 Diluted: Net income available to common shareholders, basic $ 15,611 148,956 $ 49,389 147,506 Effect of dilutive securities: Share-based awards other than participating securities — 868 — 580 Undistributed earnings reallocated to participating securities 1 — 2 — Net income available to common shareholders, diluted $ 15,612 149,824 $ 49,391 148,086 The following potentially dilutive shares related to the 2022 Notes, the 2023 Notes and the 2026 Notes were excluded from the diluted EPS calculation as they were anti-dilutive (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 2022 Notes 5,688 8,997 7,886 8,997 2023 Notes 8,076 13,202 11,481 13,202 2026 Notes 14,650 — 4,919 —

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Employee Benefit Plans	Employee Benefit Plans Long-Term Incentive Plan As of September 30, 2020, there were 7.0 million shares of our common stock available for issuance under our 2005 Long-Term Incentive Plan, as amended and restated (the “2005 Incentive Plan”). During the nine-month period ended September 30, 2020, the following grants of share-based awards were made under the 2005 Incentive Plan: Date of Grant Shares/ Grant Date Vesting Period January 2, 2020 (1) 369,938 $ 9.63 33% per year over three years January 2, 2020 (2) 369,938 13.15 100% on January 2, 2023 January 2, 2020 (3) 5,679 9.63 100% on January 1, 2022 April 1, 2020 (3) 43,351 1.64 100% on January 1, 2022 July 1, 2020 (3) 19,407 3.47 100% on January 1, 2022 (1) Reflects grants of restricted stock to our executive officers and select management employees. (2) Reflects grants of performance share units (“PSUs”) to our executive officers and select management employees. The PSUs provide for an award based on the performance of our common stock over a three-year period with the maximum amount of the award being 200% of the original PSU awards and the minimum amount being zero. (3) Reflects grants of restricted stock to certain independent members of our Board of Directors who have elected to take their quarterly fees in stock in lieu of cash. Compensation cost for restricted stock is the product of the grant date fair value of each share and the number of shares granted and is recognized over the applicable vesting period on a straight-line basis. Forfeitures are recognized as they occur. For the three- and nine-month periods ended September 30, 2020, $1.1 million and $3.2 million, respectively, were recognized as share-based compensation related to restricted stock. For the three- and nine-month periods ended September 30, 2019, $1.2 million and $4.9 million, respectively, were recognized as share-based compensation related to restricted stock. The estimated fair value of PSUs is determined using a Monte Carlo simulation model. Our existing PSUs are to be settled solely in shares of our common stock and are accounted for as equity awards. Compensation cost for PSUs is measured based on the estimated grant date fair value and recognized over the vesting period on a straight-line basis as an increase to shareholders’ equity. For the three- and nine-month periods ended September 30, 2020, $1.0 million and $3.0 million, respectively, were recognized as share-based compensation related to PSUs. For the three- and nine-month periods ended September 30, 2019, $1.2 million and $3.9 million, respectively, were recognized as share-based compensation related to PSUs. In January 2020, based on the performance of our common stock over a three-year period, 589,335 equity PSU awards granted in 2017 vested at 200% and resulted in the delivery of 1,178,670 shares of our common stock with a total market value of $11.4 million. In 2020 and 2019, we granted fixed-value cash awards of $4.7 million and $4.6 million, respectively, to select management employees under the 2005 Incentive Plan. The value of these cash awards is recognized on a straight-line basis over a vesting period of three years. For the three- and nine-month periods ended September 30, 2020, $1.1 million and $3.4 million, respectively, were recognized as compensation cost. For the three- and nine-month periods ended September 30, 2019, $0.8 million and $2.4 million, respectively, were recognized as compensation cost. Defined Contribution Plan We sponsor a defined contribution 401(k) retirement plan. Our discretionary contributions are in the form of cash and currently consist of a 50% match of each participant’s contribution up to 5% of the participant’s salary. Employee Stock Purchase Plan We have an employee stock purchase plan (the “ESPP”). As of September 30, 2020, 1.8 million shares were available for issuance under the ESPP. The ESPP currently has a purchase limit of 260 shares per employee per purchase period. For more information regarding our employee benefit plans, including the 2005 Incentive Plan and the ESPP, see Note 14 to our 2019 Form 10-K.

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information We have three reportable business segments: Well Intervention, Robotics and Production Facilities. Our U.S., U.K. and Brazil well intervention operating segments are aggregated into the Well Intervention segment for financial reporting purposes. Our Well Intervention segment includes our vessels and/or equipment used to perform well intervention services primarily in the Gulf of Mexico, Brazil, the North Sea and West Africa. Our well intervention vessels include the Q4000 , the Q5000 , the Q7000 , the Seawell , the Well Enhancer , and the Siem Helix 1 and Siem Helix 2 chartered vessels. Our well intervention equipment includes IRSs and SILs, some of which we provide on a stand-alone basis. Our Robotics segment includes ROVs, trenchers and a ROVDrill, which are designed to complement well intervention services and offshore construction to both the oil and gas and the renewable energy markets globally. Our Robotics segment also includes two robotics support vessels under long-term charter, the Grand Canyon II and the Grand Canyon III , as well as spot vessels. Our Production Facilities segment includes the HP I , the HFRS, our ownership interest in Independence Hub (Note 4) and our ownership of oil and gas properties (Note 14). All material intercompany transactions between the segments have been eliminated. We evaluate our performance based on operating income of each reportable segment. Certain financial data by reportable segment are summarized as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Net revenues — Well Intervention $ 140,803 $ 170,206 $ 427,296 $ 451,511 Robotics 49,802 51,909 135,896 136,396 Production Facilities 14,167 13,777 43,301 44,651 Intercompany eliminations (11,282) (23,283) (32,835) (51,398) Total $ 193,490 $ 212,609 $ 573,658 $ 581,160 Income (loss) from operations — Well Intervention $ 18,844 $ 37,689 $ 24,910 $ 74,002 Robotics 6,983 8,876 11,940 7,921 Production Facilities 4,134 3,050 11,142 11,907 Segment operating income 29,961 49,615 47,992 93,830 Goodwill impairment (1) — — (6,689) — Corporate, eliminations and other (10,946) (10,617) (29,121) (31,491) Total $ 19,015 $ 38,998 $ 12,182 $ 62,339 (1) Relates to goodwill associated with our STL acquisition (Note 6). Intercompany segment amounts are derived primarily from equipment and services provided to other business segments. Intercompany segment revenues are as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Well Intervention (1) $ 4,120 $ 15,318 $ 11,334 $ 28,355 Robotics 7,162 7,965 21,501 23,043 Total $ 11,282 $ 23,283 $ 32,835 $ 51,398 (1) The three- and nine-month periods ended September 30, 2019 included $10.6 million and $15.9 million, respectively, associated with P&A work on our Droshky oil and gas properties in our Production Facilities segment (Note 14). Segment assets are comprised of all assets attributable to each reportable segment. Corporate and other includes all assets not directly identifiable with our business segments, most notably the majority of our cash and cash equivalents. The following table reflects total assets by reportable segment (in thousands): September 30, December 31, Well Intervention $ 2,110,889 $ 2,180,180 Robotics 142,538 151,478 Production Facilities 133,778 142,624 Corporate and other 118,269 122,449 Total $ 2,505,474 $ 2,596,731

Asset Retirement Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations Asset retirement obligations (“AROs”) are recorded at fair value and consist of estimated costs for subsea infrastructure P&A activities associated with our oil and gas properties. In connection with the acquisition of our Droshky oil and gas properties which we acquired from Marathon Oil in January 2019, we assumed the AROs for the required P&A of those assets in exchange for agreed-upon amounts to be paid by Marathon Oil as the P&A work is completed. The estimated P&A costs are discounted to present value using a credit-adjusted risk-free discount rate. After its initial recognition, an ARO liability is increased for the passage of time as accretion expense, which is a component of our depreciation and amortization expense. An ARO liability may also change based on revisions in estimated costs and/or timing to settle the obligations. The following table describes the changes in our AROs (in thousands): AROs at January 1, 2020 $ 28,258 Other revisions in estimated cash flows — Accretion expense 2,021 AROs at September 30, 2020 $ 30,279

Commitments And Contingencies A

Commitments And Contingencies And Other Matters	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies And Other Matters	Commitments and Contingencies and Other Matters Commitments We have long-term charter agreements with Siem Offshore AS (“Siem”) for the Siem Helix 1 and Siem Helix 2 vessels, which are currently used in connection with our contracts with Petróleo Brasileiro S.A. (“Petrobras”) to perform well intervention work offshore Brazil. The initial term of the charter agreements with Siem is for seven years, with options to extend. The Siem Helix 1 charter expires June 2023 and the Siem Helix 2 charter expires February 2024. We have long-term charter agreements for the Grand Canyon II and Grand Canyon III vessels for use in our robotics operations. The Grand Canyon II charter expires April 2021 and the Grand Canyon III charter expires May 2023. We took delivery of the Q7000 in November 2019, and the vessel commenced operations in January 2020. With the delivery of the Q7000 , all of our significant capital commitments have been completed. Contingencies and Claims We believe that there are currently no contingencies that would have a material adverse effect on our financial position, results of operations or cash flows. Litigation We are involved in various legal proceedings, some involving claims for personal injury under the General Maritime Laws of the United States and the Jones Act. In addition, from time to time we receive other claims, such as contract and employment-related disputes, in the normal course of business.

Statement Of Cash Flow Informat

Statement Of Cash Flow Information	9 Months Ended
	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Statement Of Cash Flow Information	Statement of Cash Flow Information We define cash and cash equivalents as cash and all highly liquid financial instruments with original maturities of three months or less. We classify cash as restricted when there are legal or contractual restrictions for its withdrawal. The following table provides supplemental cash flow information (in thousands): Nine Months Ended 2020 2019 Interest paid, net of interest capitalized $ 14,255 $ 2,404 Income taxes paid 6,436 7,535 Our capital additions include the acquisition of property and equipment for which payment has not been made. These non-cash capital additions totaled $1.2 million at September 30, 2020 and $10.2 million at December 31, 2019.

Allowance For Credit Losses

Allowance For Credit Losses	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Allowance For Credit Losses	Allowance for Credit Losses We estimate current expected credit losses on our accounts receivable at each reporting date. We estimate current expected credit losses based on our credit loss history, adjusted for current factors including global economic and business conditions, oil and gas industry and market conditions, customer mix, contract payment terms and past due accounts receivable. The following table sets forth the activity in our allowance for credit losses (in thousands): Allowance for Credit Losses Balance at December 31, 2019 $ — Initial adoption of ASU 2016-13 (Note 1) 785 Provision for current expected credit losses (1) 2,387 Balance at September 30, 2020 $ 3,172 (1) This amount consists of a $1.7 million credit loss reserve related to a receivable in our Robotics segment and general current expected credit loss adjustments.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value accounting rules establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: • Level 1 — Observable inputs such as quoted prices in active markets; • Level 2 — Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 — Unobservable inputs for which there is little or no market data, which require the reporting entity to develop its own assumptions. Assets and liabilities measured at fair value are based on one or more of three valuation approaches as follows: (a) Market Approach — Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. (b) Cost Approach — Amount that would be required to replace the service capacity of an asset (replacement cost). (c) Income Approach — Techniques to convert expected future cash flows to a single present amount based on market expectations (including present value techniques, option-pricing and excess earnings models). Our financial instruments include cash and cash equivalents, receivables, accounts payable, long-term debt and derivative instruments. The carrying amount of cash and cash equivalents, trade and other current receivables as well as accounts payable approximates fair value due to the short-term nature of these instruments. The fair value of our derivative instruments (Note 19) reflects our best estimate and is based upon exchange or over-the-counter quotations whenever they are available. Quoted valuations may not be available due to location differences or terms that extend beyond the period for which quotations are available. Where quotes are not available, we utilize other valuation techniques or models to estimate market values. The fair value of our interest rate swaps is calculated as the discounted cash flows of the difference between the rate fixed by the hedging instrument and the LIBOR forward curve over the remaining term of the hedging instrument. The fair value of our foreign currency exchange contracts is calculated as the discounted cash flows of the difference between the fixed payment specified by the hedging instrument and the expected cash inflow of the forecasted transaction using a foreign currency forward curve. These modeling techniques require us to make estimations of future prices, price correlation, volatility and liquidity based on market data. As of September 30, 2020, there were no financial instruments measured at fair value on a recurring basis. The following table provides additional information relating to financial instruments measured at fair value on a recurring basis as of December 31, 2019 (in thousands): . Level 1 Level 2 Level 3 Total Valuation Assets: Interest rate swaps $ — $ 44 $ — $ 44 (c) Liabilities: Foreign exchange contracts — hedging instruments — 401 — 401 (c) Foreign exchange contracts — non-hedging instruments — 601 — 601 (c) Total net liability $ — $ 958 $ — $ 958 The principal amount and estimated fair value of our long-term debt are as follows (in thousands): September 30, 2020 December 31, 2019 Principal Amount (1) Fair Value (2) (3) Principal Amount (1) Fair Value (2) (3) Term Loan (matures December 2021) $ 30,625 $ 30,051 $ 33,250 $ 32,959 Nordea Q5000 Loan (matures January 2021) (4) 62,500 62,656 89,286 89,398 MARAD Debt (matures February 2027) 56,410 62,551 63,610 68,643 2022 Notes (mature May 2022) 35,000 33,075 125,000 134,225 2023 Notes (mature September 2023) 30,000 27,300 125,000 162,188 2026 Notes (mature February 2026) 200,000 160,626 — — Total debt $ 414,535 $ 376,259 $ 436,146 $ 487,413 (1) Principal amount includes current maturities and excludes the related unamortized debt discount and debt issuance costs. See Note 7 for additional disclosures on our long-term debt. (2) The estimated fair value of the 2022 Notes, the 2023 Notes and the 2026 Notes was determined using Level 1 fair value inputs under the market approach. The fair value of the Term Loan, the Nordea Q5000 Loan and the MARAD Debt was estimated using Level 2 fair value inputs under the market approach, which was determined using a third-party evaluation of the remaining average life and outstanding principal balance of the indebtedness as compared to other obligations in the marketplace with similar terms. (3) The principal amount and estimated fair value of the 2022 Notes, the 2023 Notes and the 2026 Notes are for the entire instrument inclusive of the conversion feature reported in shareholders’ equity. (4) The maturity date of the Nordea Q5000 Loan was extended from April 2020 to January 2021 as a result of an amendment to the Nordea Credit Agreement in March 2020 (Note 7).

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments And Hedging Activities	Derivative Instruments and Hedging Activities Our business is exposed to market risks associated with interest rates and foreign currency exchange rates. Our risk management activities involve the use of derivative financial instruments to mitigate the impact of market risk exposure related to variable interest rates and foreign currency exchange rates. To reduce the impact of these risks on earnings and increase the predictability of our cash flows, from time to time we enter into derivative contracts, including interest rate swaps and foreign currency exchange contracts. Interest rate and foreign currency derivative instruments are reflected in the accompanying condensed consolidated balance sheets at fair value. The 2026 Capped Calls are recorded in shareholders’ equity and are not accounted for as derivatives. We engage solely in cash flow hedges. Cash flow hedges are entered into to hedge the variability of cash flows related to a forecasted transaction or to be received or paid related to a recognized asset or liability. Changes in the fair value of derivative instruments that are designated as cash flow hedges are reported in OCI. These changes are subsequently reclassified into earnings when the hedged transactions affect earnings. Changes in the fair value of a derivative instrument that does not qualify for hedge accounting are recorded in earnings in the period in which the change occurs. For additional information regarding our accounting for derivative instruments and hedging activities, see Notes 2 and 21 to our 2019 Form 10-K. Interest Rate Risk From time to time, we enter into interest rate swaps to stabilize cash flows related to our long-term variable interest rate debt. In June 2015, we entered into interest rate swap contracts to fix the interest rate on $187.5 million of the Nordea Q5000 Loan. These swap contracts expired in April 2020. Our interest rate swap contracts qualified for cash flow hedge accounting treatment. Changes in the fair value of interest rate swaps were reported in accumulated OCI (net of tax). These changes were subsequently reclassified into earnings when the anticipated interest was recognized as interest expense. Foreign Currency Exchange Rate Risk Because we operate in various regions around the world, we conduct a portion of our business in currencies other than the U.S. dollar. We enter into foreign currency exchange contracts from time to time to stabilize expected cash outflows related to forecasted transactions that are denominated in foreign currencies. In February 2013, we entered into foreign currency exchange contracts to hedge our foreign currency exposure associated with the Grand Canyon II and Grand Canyon III charter payments denominated in Norwegian kroner through July 2019 and February 2020, respectively. Changes in the fair value of foreign currency exchange contracts that qualify for hedge accounting treatment were reported in accumulated OCI (net of tax). These changes were subsequently reclassified into earnings when the forecasted payments were made. Changes in the fair value of foreign currency exchange contracts that did not qualify as cash flow hedges were recognized immediately in earnings within “Other expense, net” in the accompanying condensed consolidated statements of operations. Quantitative Disclosures Relating to Derivative Instruments We had no derivative instruments that were designated as hedging instruments as of September 30, 2020. The following table presents the balance sheet location and fair value of our hedging instruments as of December 31, 2019 (in thousands): December 31, 2019 Balance Sheet Fair Asset Derivative Instruments: Interest rate swaps Other current assets $ 44 $ 44 Liability Derivative Instruments: Foreign exchange contracts Accrued liabilities $ 401 $ 401 We had no derivative instruments that were not designated as hedging instruments as of September 30, 2020. The following table presents the balance sheet location and fair value of our non-hedging instruments as of December 31, 2019 (in thousands): December 31, 2019 Balance Sheet Fair Liability Derivative Instruments: Foreign exchange contracts Accrued liabilities $ 601 $ 601 The following tables present the impact that derivative instruments designated as hedging instruments had on our accumulated OCI (net of tax) and our condensed consolidated statements of operations (in thousands): Unrealized Gain (Loss) Recognized in OCI Three Months Ended Nine Months Ended 2020 2019 2020 2019 Foreign exchange contracts $ — $ (280) $ (54) $ (338) Interest rate swaps — 6 (41) (363) $ — $ (274) $ (95) $ (701) Location of Gain (Loss) Gain (Loss) Reclassified from Three Months Ended Nine Months Ended 2020 2019 2020 2019 Foreign exchange contracts Cost of sales $ — $ (1,197) $ (455) $ (5,460) Interest rate swaps Net interest expense — 151 3 593 $ — $ (1,046) $ (452) $ (4,867) The following table presents the impact that derivative instruments not designated as hedging instruments had on our condensed consolidated statements of operations (in thousands): Location of Loss Loss Recognized in Earnings Three Months Ended Nine Months Ended 2020 2019 2020 2019 Foreign exchange contracts Other expense, net $ — $ (371) $ (81) $ (413) $ — $ (371) $ (81) $ (413)

Basis Of Presentation And New_2

Basis Of Presentation And New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	The accompanying condensed consolidated financial statements include the accounts of Helix Energy Solutions Group, Inc. and its subsidiaries (collectively, “Helix”). Unless the context indicates otherwise, the terms “we,” “us” and “our” in this report refer collectively to Helix and its subsidiaries. All material intercompany accounts and transactions have been eliminated. These unaudited condensed consolidated financial statements have been prepared pursuant to instructions for the Quarterly Report on Form 10-Q required to be filed with the Securities and Exchange Commission (the “SEC”) and do not include all information and footnotes normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The accompanying condensed consolidated financial statements have been prepared in conformity with GAAP in U.S. dollars and are consistent in all material respects with those applied in our 2019 Annual Report on Form 10-K (our “2019 Form 10-K”) with the exception of the impact of adopting the new credit loss accounting standard in 2020 (see below). The preparation of these financial statements requires us to make estimates and judgments that affect the amounts reported in the financial statements and the related disclosures. Actual results may differ from our estimates. We have made all adjustments, which, unless otherwise disclosed, are of normal recurring nature, that we believe are necessary for a fair presentation of the condensed consolidated balance sheets, statements of operations, statements of comprehensive income and statements of cash flows, as applicable. The operating results for the three- and nine-month periods ended September 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. Our balance sheet as of December 31, 2019 included herein has been derived from the audited balance sheet as of December 31, 2019 included in our 2019 Form 10-K. These unaudited condensed consolidated financial statements should be read in conjunction with the annual audited consolidated financial statements and notes thereto included in our 2019 Form 10-K.
Reclassifications	Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current presentation format.
New Accounting Standards	New accounting standards adopted In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” which was updated by subsequent amendments. This ASU replaces the current incurred loss model for measurement of credit losses on financial assets (including trade receivables) with a forward-looking expected loss model based on historical experience, current conditions, and reasonable and supportable forecasts. The guidance became effective for us as of January 1, 2020 and resulted in the recognition of $0.6 million (net of deferred taxes of $0.2 million) of allowances for expected credit losses related to our accounts receivable through a cumulative effect offset to retained earnings. The new credit loss standard is expected to accelerate recognition of credit losses on our accounts receivable. See Note 17 for additional information regarding allowance for credit losses on our accounts receivable. New accounting standards issued but not yet effective In August 2020, the FASB issued ASU No. 2020-06, “Accounting for Convertible Instruments and Contracts in an Entity's Own Equity,” which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, this ASU removes from GAAP the liability and equity separation model for convertible instruments with conversion features that are not required to be bifurcated as a derivative under ASC Topic 815, Derivatives and Hedging, or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost and a convertible preferred stock will be accounted for as a single equity instrument measured at its historical cost, as long as no other features require bifurcation and recognition as derivatives. The embedded conversion feature will no longer be amortized into income as interest expense over the life of the instrument. The adoption of this ASU is expected to increase the net book value of our long-term debt and reduce shareholders’ equity as we reclassify the conversion features associated with our various outstanding convertible senior notes (Note 7). Subsequent to its adoption, the ASU is also expected to reduce our interest expense. Additionally, the ASU no longer permits the treasury stock method and instead requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share (“EPS”). The guidance is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a fully retrospective or modified retrospective basis. We are currently evaluating when to adopt the ASU and the impact it will have on our consolidated financial statements. We do not expect any other new accounting standards to have a material impact on our financial position, results of operations or cash flows when they become effective.

Details Of Certain Accounts (Ta

Details Of Certain Accounts (Tables)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of other current assets	Other current assets consist of the following (in thousands): September 30, December 31, Contract assets (Note 10) $ 1,883 $ 740 Prepaids 17,949 12,635 Deferred costs (Note 10) 22,857 28,340 Income tax receivable 25,493 1,261 Other receivable (1) 29,180 — Other 6,755 7,474 Total other current assets $ 104,117 $ 50,450 (1) Agreed-upon amounts to be paid to us by Marathon Oil Corporation (“Marathon Oil”) as the required plug and abandonment (“P&A”) work associated with our Droshky oil and gas properties is completed (Note 14).
Schedule of other assets, net	Other assets, net consist of the following (in thousands): September 30, December 31, Prepaids $ 527 $ 777 Deferred recertification and dry dock costs, net 24,030 16,065 Deferred costs (Note 10) 3,284 14,531 Charter deposit (1) 12,544 12,544 Other receivable (2) — 27,264 Goodwill (Note 6) — 7,157 Intangible assets with finite lives, net 3,716 3,847 Other 2,026 2,323 Total other assets, net $ 46,127 $ 84,508 (1) This amount is deposited with the owner of the Siem Helix 2 to offset certain payment obligations associated with the vessel at the end of the charter term. (2) Agreed-upon amounts to be paid to us by Marathon Oil as the required P&A work associated with our Droshky oil and gas properties is completed (Note 14).
Schedule of accrued liabilities	Accrued liabilities consist of the following (in thousands): September 30, December 31, Accrued payroll and related benefits $ 26,315 $ 31,417 Investee losses in excess of investment (Note 4) 1,940 4,069 Deferred revenue (Note 10) 9,795 11,568 Asset retirement obligations (Note 14) 30,279 — Derivative liability (Note 19) — 1,002 Other 16,328 14,333 Total accrued liabilities $ 84,657 $ 62,389
Schedule of other non-current liabilities	Other non-current liabilities consist of the following (in thousands): September 30, December 31, Deferred revenue (Note 10) $ 2,976 $ 8,286 Asset retirement obligations (Note 14) — 28,258 Other 1,982 2,100 Total other non-current liabilities $ 4,958 $ 38,644

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Schedule of components of lease cost	The following table details the components of our lease cost (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Operating lease cost $ 16,132 $ 18,002 $ 48,561 $ 54,191 Variable lease cost 4,204 3,630 11,256 9,927 Short-term lease cost 12,923 5,587 30,089 14,549 Sublease income (344) (351) (951) (1,077) Net lease cost $ 32,915 $ 26,868 $ 88,955 $ 77,590
Schedule of maturities of operating lease liabilities	Maturities of our operating lease liabilities as of September 30, 2020 are as follows (in thousands): Vessels Facilities and Equipment Total Remainder of 2020 $ 15,018 $ 1,532 $ 16,550 2021 54,421 5,646 60,067 2022 52,106 5,135 57,241 2023 34,580 4,598 39,178 2024 2,470 4,328 6,798 Thereafter — 6,125 6,125 Total lease payments $ 158,595 $ 27,364 $ 185,959 Less: imputed interest (15,896) (4,946) (20,842) Total operating lease liabilities $ 142,699 $ 22,418 $ 165,117 Current operating lease liabilities $ 47,552 $ 4,608 $ 52,160 Non-current operating lease liabilities 95,147 17,810 112,957 Total operating lease liabilities $ 142,699 $ 22,418 $ 165,117 Maturities of our operating lease liabilities as of December 31, 2019 are as follows (in thousands): Vessels Facilities and Equipment Total 2020 $ 60,210 $ 6,610 $ 66,820 2021 54,564 5,888 60,452 2022 52,106 5,257 57,363 2023 34,580 4,622 39,202 2024 2,470 4,349 6,819 Thereafter — 6,251 6,251 Total lease payments $ 203,930 $ 32,977 $ 236,907 Less: imputed interest (24,846) (6,449) (31,295) Total operating lease liabilities $ 179,084 $ 26,528 $ 205,612 Current operating lease liabilities $ 48,716 $ 5,069 $ 53,785 Non-current operating lease liabilities 130,368 21,459 151,827 Total operating lease liabilities $ 179,084 $ 26,528 $ 205,612
Schedule of weighted average remaining lease term and discount rate	The following table presents the weighted average remaining lease term and discount rate: September 30, December 31, Weighted average remaining lease term 3.3 years 4.0 years Weighted average discount rate 7.53 % 7.54 %
Schedule of other information related to operating leases	The following table presents other information related to our operating leases (in thousands): Nine Months Ended 2020 2019 Cash paid for operating lease liabilities $ 49,350 $ 54,538 ROU assets obtained in exchange for new operating lease obligations 36 921

Business Combinations And Goo_2

Business Combinations And Goodwill (Tables)	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes in carrying amount of goodwill	The changes in the carrying amount of goodwill are as follows (in thousands): Well Intervention Balance at December 31, 2019 $ 7,157 Impairment loss (6,689) Other adjustments (1) (468) Balance at September 30, 2020 $ — (1) Relates to foreign currency adjustments.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Schedule of maturities of long-term debt outstanding	Scheduled maturities of our long-term debt outstanding as of September 30, 2020 are as follows (in thousands): Term Loan (1) 2022 2023 2026 MARAD Nordea Total Less than one year $ 3,500 $ — $ — $ — $ 7,560 $ 62,500 $ 73,560 One to two years 27,125 35,000 — — 7,937 — 70,062 Two to three years — — 30,000 — 8,333 — 38,333 Three to four years — — — — 8,749 — 8,749 Four to five years — — — — 9,186 — 9,186 Over five years — — — 200,000 14,645 — 214,645 Gross debt 30,625 35,000 30,000 200,000 56,410 62,500 414,535 Unamortized debt discounts (2) — (1,560) (2,869) (43,133) — — (47,562) Unamortized debt issuance costs (3) (239) (235) (462) (5,761) (3,171) (159) (10,027) Total debt 30,386 33,205 26,669 151,106 53,239 62,341 356,946 Less: current maturities (3,500) — — — (7,560) (62,341) (73,401) Long-term debt $ 26,886 $ 33,205 $ 26,669 $ 151,106 $ 45,679 $ — $ 283,545 (1) Term Loan pursuant to the Credit Agreement (as defined below) matures in December 2021. (2) Convertible Senior Notes due 2022, 2023 and 2026 will increase to their face amounts through accretion of their debt discounts to interest expense through May 2022, September 2023 and February 2026, respectively. (3) Debt issuance costs are amortized to interest expense over the term of the applicable debt agreement.
Schedule of components of net interest expense	The following table details the components of our net interest expense (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Interest expense $ 8,007 $ 7,694 $ 22,580 $ 23,635 Interest income (409) (652) (991) (2,085) Capitalized interest — (5,141) (1,182) (15,346) Net interest expense $ 7,598 $ 1,901 $ 20,407 $ 6,204

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Schedule of differences between income tax provision (benefit) at U.S. statutory rate and actual income tax provision (benefit)	The primary differences between the income tax provision (benefit) at the U.S. statutory rate and our actual income tax provision (benefit) are as follows (dollars in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Taxes at U.S. statutory rate $ 6,232 21.0 % $ 7,384 21.0 % $ (35) 21.0 % $ 11,866 21.0 % Foreign tax provision 1,088 3.7 (3,574) (10.1) (28) 17.0 (5,488) (9.7) CARES Act (2,362) (8.0) — — (7,596) 4,603.6 — — Subsidiary restructuring — — — — (8,333) 5,050.3 — — Other 274 0.9 (271) (0.8) (140) 85.1 361 0.6 Income tax provision (benefit) $ 5,232 17.6 % $ 3,539 10.1 % $ (16,132) 9,777.0 % $ 6,739 11.9 %

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
Schedule of components of accumulated OCI	The components of accumulated other comprehensive loss (“accumulated OCI”) are as follows (in thousands): September 30, December 31, Cumulative foreign currency translation adjustment $ (80,512) $ (64,455) Net unrealized loss on hedges, net of tax (1) — (285) Accumulated OCI $ (80,512) $ (64,740) (1) Relates to foreign currency hedges for the Grand Canyon III charter as well as interest rate hedge contracts for the Nordea Q5000 Loan (Note 19).

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Schedule of disaggregation of revenue	The following table provides information about disaggregated revenue by contract duration (in thousands): Well Intervention Robotics Production Facilities Intercompany Eliminations (1) Total Revenue Three months ended September 30, 2020 Short-term $ 46,907 $ 28,782 $ — $ — $ 75,689 Long-term 93,896 21,020 14,167 (11,282) 117,801 Total $ 140,803 $ 49,802 $ 14,167 $ (11,282) $ 193,490 Three months ended September 30, 2019 Short-term $ 53,018 $ 26,809 $ — $ — $ 79,827 Long-term 117,188 25,100 13,777 (23,283) 132,782 Total $ 170,206 $ 51,909 $ 13,777 $ (23,283) $ 212,609 Nine months ended September 30, 2020 Short-term $ 184,599 $ 87,307 $ — $ — $ 271,906 Long-term 242,697 48,589 43,301 (32,835) 301,752 Total $ 427,296 $ 135,896 $ 43,301 $ (32,835) $ 573,658 Nine months ended September 30, 2019 Short-term $ 145,611 $ 80,440 $ — $ — $ 226,051 Long-term 305,900 55,956 44,651 (51,398) 355,109 Total $ 451,511 $ 136,396 $ 44,651 $ (51,398) $ 581,160 (1) Intercompany revenues among our segments are under agreements that are considered long-term.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Schedule of computations of basic and diluted EPS	The computations of the numerator (income) and denominator (shares) to derive the basic and diluted EPS amounts presented on the face of the accompanying condensed consolidated statements of operations are as follows (in thousands): Three Months Ended Three Months Ended Income Shares Income Shares Basic: Net income attributable to common shareholders $ 24,499 $ 31,695 Less: Undistributed earnings allocated to participating securities (180) (261) Accretion of redeemable noncontrolling interests (128) (25) Net income available to common shareholders, basic $ 24,191 149,032 $ 31,409 147,575 Diluted: Net income available to common shareholders, basic $ 24,191 149,032 $ 31,409 147,575 Effect of dilutive securities: Share-based awards other than participating securities — 919 — 779 Undistributed earnings reallocated to participating securities 2 — 1 — Net income available to common shareholders, diluted $ 24,193 149,951 $ 31,410 148,354 Nine Months Ended Nine Months Ended Income Shares Income Shares Basic: Net income attributable to common shareholders $ 18,011 $ 49,867 Less: Undistributed earnings allocated to participating securities (117) (435) Accretion of redeemable noncontrolling interests (2,283) (43) Net income available to common shareholders, basic $ 15,611 148,956 $ 49,389 147,506 Diluted: Net income available to common shareholders, basic $ 15,611 148,956 $ 49,389 147,506 Effect of dilutive securities: Share-based awards other than participating securities — 868 — 580 Undistributed earnings reallocated to participating securities 1 — 2 — Net income available to common shareholders, diluted $ 15,612 149,824 $ 49,391 148,086
Schedule of shares excluded from diluted EPS calculation	The following potentially dilutive shares related to the 2022 Notes, the 2023 Notes and the 2026 Notes were excluded from the diluted EPS calculation as they were anti-dilutive (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 2022 Notes 5,688 8,997 7,886 8,997 2023 Notes 8,076 13,202 11,481 13,202 2026 Notes 14,650 — 4,919 —

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Schedule of grants of share-based awards	During the nine-month period ended September 30, 2020, the following grants of share-based awards were made under the 2005 Incentive Plan: Date of Grant Shares/ Grant Date Vesting Period January 2, 2020 (1) 369,938 $ 9.63 33% per year over three years January 2, 2020 (2) 369,938 13.15 100% on January 2, 2023 January 2, 2020 (3) 5,679 9.63 100% on January 1, 2022 April 1, 2020 (3) 43,351 1.64 100% on January 1, 2022 July 1, 2020 (3) 19,407 3.47 100% on January 1, 2022 (1) Reflects grants of restricted stock to our executive officers and select management employees. (2) Reflects grants of performance share units (“PSUs”) to our executive officers and select management employees. The PSUs provide for an award based on the performance of our common stock over a three-year period with the maximum amount of the award being 200% of the original PSU awards and the minimum amount being zero. (3) Reflects grants of restricted stock to certain independent members of our Board of Directors who have elected to take their quarterly fees in stock in lieu of cash.

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule of financial data by reportable segment	Certain financial data by reportable segment are summarized as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Net revenues — Well Intervention $ 140,803 $ 170,206 $ 427,296 $ 451,511 Robotics 49,802 51,909 135,896 136,396 Production Facilities 14,167 13,777 43,301 44,651 Intercompany eliminations (11,282) (23,283) (32,835) (51,398) Total $ 193,490 $ 212,609 $ 573,658 $ 581,160 Income (loss) from operations — Well Intervention $ 18,844 $ 37,689 $ 24,910 $ 74,002 Robotics 6,983 8,876 11,940 7,921 Production Facilities 4,134 3,050 11,142 11,907 Segment operating income 29,961 49,615 47,992 93,830 Goodwill impairment (1) — — (6,689) — Corporate, eliminations and other (10,946) (10,617) (29,121) (31,491) Total $ 19,015 $ 38,998 $ 12,182 $ 62,339 (1) Relates to goodwill associated with our STL acquisition (Note 6).
Schedule of intercompany segment revenues	Intercompany segment revenues are as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Well Intervention (1) $ 4,120 $ 15,318 $ 11,334 $ 28,355 Robotics 7,162 7,965 21,501 23,043 Total $ 11,282 $ 23,283 $ 32,835 $ 51,398 (1) The three- and nine-month periods ended September 30, 2019 included $10.6 million and $15.9 million, respectively, associated with P&A work on our Droshky oil and gas properties in our Production Facilities segment (Note 14).
Schedule of total assets by reportable segment	The following table reflects total assets by reportable segment (in thousands): September 30, December 31, Well Intervention $ 2,110,889 $ 2,180,180 Robotics 142,538 151,478 Production Facilities 133,778 142,624 Corporate and other 118,269 122,449 Total $ 2,505,474 $ 2,596,731

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
Schedule of asset retirement obligations	The following table describes the changes in our AROs (in thousands): AROs at January 1, 2020 $ 28,258 Other revisions in estimated cash flows — Accretion expense 2,021 AROs at September 30, 2020 $ 30,279

Statement Of Cash Flow Inform_2

Statement Of Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Schedule of supplemental cash flow information	The following table provides supplemental cash flow information (in thousands): Nine Months Ended 2020 2019 Interest paid, net of interest capitalized $ 14,255 $ 2,404 Income taxes paid 6,436 7,535

Allowance For Credit Losses (Ta

Allowance For Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Schedule of activities in allowance for credit losses	The following table sets forth the activity in our allowance for credit losses (in thousands): Allowance for Credit Losses Balance at December 31, 2019 $ — Initial adoption of ASU 2016-13 (Note 1) 785 Provision for current expected credit losses (1) 2,387 Balance at September 30, 2020 $ 3,172 (1) This amount consists of a $1.7 million credit loss reserve related to a receivable in our Robotics segment and general current expected credit loss adjustments.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of financial instruments measured at fair value on a recurring basis	As of September 30, 2020, there were no financial instruments measured at fair value on a recurring basis. The following table provides additional information relating to financial instruments measured at fair value on a recurring basis as of December 31, 2019 (in thousands):. Level 1 Level 2 Level 3 Total Valuation Assets: Interest rate swaps $ — $ 44 $ — $ 44 (c) Liabilities: Foreign exchange contracts — hedging instruments — 401 — 401 (c) Foreign exchange contracts — non-hedging instruments — 601 — 601 (c) Total net liability $ — $ 958 $ — $ 958
Schedule of principal amount and estimated fair value of long-term debt	The principal amount and estimated fair value of our long-term debt are as follows (in thousands): September 30, 2020 December 31, 2019 Principal Amount (1) Fair Value (2) (3) Principal Amount (1) Fair Value (2) (3) Term Loan (matures December 2021) $ 30,625 $ 30,051 $ 33,250 $ 32,959 Nordea Q5000 Loan (matures January 2021) (4) 62,500 62,656 89,286 89,398 MARAD Debt (matures February 2027) 56,410 62,551 63,610 68,643 2022 Notes (mature May 2022) 35,000 33,075 125,000 134,225 2023 Notes (mature September 2023) 30,000 27,300 125,000 162,188 2026 Notes (mature February 2026) 200,000 160,626 — — Total debt $ 414,535 $ 376,259 $ 436,146 $ 487,413 (1) Principal amount includes current maturities and excludes the related unamortized debt discount and debt issuance costs. See Note 7 for additional disclosures on our long-term debt. (2) The estimated fair value of the 2022 Notes, the 2023 Notes and the 2026 Notes was determined using Level 1 fair value inputs under the market approach. The fair value of the Term Loan, the Nordea Q5000 Loan and the MARAD Debt was estimated using Level 2 fair value inputs under the market approach, which was determined using a third-party evaluation of the remaining average life and outstanding principal balance of the indebtedness as compared to other obligations in the marketplace with similar terms. (3) The principal amount and estimated fair value of the 2022 Notes, the 2023 Notes and the 2026 Notes are for the entire instrument inclusive of the conversion feature reported in shareholders’ equity. (4) The maturity date of the Nordea Q5000 Loan was extended from April 2020 to January 2021 as a result of an amendment to the Nordea Credit Agreement in March 2020 (Note 7).

Derivative Instruments And He_2

Derivative Instruments And Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of balance sheet location and fair value of derivative instruments designated as hedging instruments	We had no derivative instruments that were designated as hedging instruments as of September 30, 2020. The following table presents the balance sheet location and fair value of our hedging instruments as of December 31, 2019 (in thousands): December 31, 2019 Balance Sheet Fair Asset Derivative Instruments: Interest rate swaps Other current assets $ 44 $ 44 Liability Derivative Instruments: Foreign exchange contracts Accrued liabilities $ 401 $ 401
Schedule of balance sheet location and fair value of derivative instruments not designated as hedging instruments	We had no derivative instruments that were not designated as hedging instruments as of September 30, 2020. The following table presents the balance sheet location and fair value of our non-hedging instruments as of December 31, 2019 (in thousands): December 31, 2019 Balance Sheet Fair Liability Derivative Instruments: Foreign exchange contracts Accrued liabilities $ 601 $ 601
Schedule of unrealized gain (loss) recognized in OCI	The following tables present the impact that derivative instruments designated as hedging instruments had on our accumulated OCI (net of tax) and our condensed consolidated statements of operations (in thousands): Unrealized Gain (Loss) Recognized in OCI Three Months Ended Nine Months Ended 2020 2019 2020 2019 Foreign exchange contracts $ — $ (280) $ (54) $ (338) Interest rate swaps — 6 (41) (363) $ — $ (274) $ (95) $ (701)
Schedule of gain (loss) reclassified from Accumulated OCI into earnings	Location of Gain (Loss) Gain (Loss) Reclassified from Three Months Ended Nine Months Ended 2020 2019 2020 2019 Foreign exchange contracts Cost of sales $ — $ (1,197) $ (455) $ (5,460) Interest rate swaps Net interest expense — 151 3 593 $ — $ (1,046) $ (452) $ (4,867)
Schedule of impact of derivative instruments not designated as hedging instruments on condensed consolidated statements of operations	The following table presents the impact that derivative instruments not designated as hedging instruments had on our condensed consolidated statements of operations (in thousands): Location of Loss Loss Recognized in Earnings Three Months Ended Nine Months Ended 2020 2019 2020 2019 Foreign exchange contracts Other expense, net $ — $ (371) $ (81) $ (413) $ — $ (371) $ (81) $ (413)

Basis Of Presentation And New_3

Basis Of Presentation And New Accounting Standards - New Accounting Standards (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for expected credit losses on accounts receivable		$ 2,387
Retained Earnings | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for expected credit losses on accounts receivable	$ 600
Tax effect of expected credit losses	$ 200

Company Overview (Details)

Company Overview (Details)	9 Months Ended
	Sep. 30, 2020vesselsegment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Well Intervention
Segment Reporting Information [Line Items]
Number of long-term chartered vessels	2
Robotics
Segment Reporting Information [Line Items]
Number of long-term chartered vessels	2

Details Of Certain Accounts - O

Details Of Certain Accounts - Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Contract assets (Note 10)	$ 1,883	$ 740
Prepaids	17,949	12,635
Deferred costs (Note 10)	22,857	28,340
Income tax receivable	25,493	1,261
Other receivable	29,180	0
Other	6,755	7,474
Total other current assets	$ 104,117	$ 50,450

Details Of Certain Accounts -_2

Details Of Certain Accounts - Other Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaids	$ 527	$ 777
Deferred recertification and dry dock costs, net	24,030	16,065
Deferred costs (Note 10)	3,284	14,531
Charter deposit	12,544	12,544
Other receivable	0	27,264
Goodwill (Note 6)	0	7,157
Intangible assets with finite lives, net	3,716	3,847
Other	2,026	2,323
Total other assets, net	$ 46,127	$ 84,508

Details Of Certain Accounts - A

Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payroll and related benefits	$ 26,315	$ 31,417
Investee losses in excess of investment (Note 4)	1,940	4,069
Deferred revenue (Note 10)	9,795	11,568
Asset retirement obligations (Note 14)	30,279	0
Derivative liability (Note 19)	0	1,002
Other	16,328	14,333
Total accrued liabilities	$ 84,657	$ 62,389

Details Of Certain Accounts -_3

Details Of Certain Accounts - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred revenue (Note 10)	$ 2,976	$ 8,286
Asset retirement obligations (Note 14)	0	28,258
Other	1,982	2,100
Total other non-current liabilities	$ 4,958	$ 38,644

Equity Method Investments - Nar

Equity Method Investments - Narrative (Details) - Independence Hub, LLC - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	20.00%
Investee losses in excess of investment	$ 1.9	$ 4.1

Leases - Components Of Lease Co

Leases - Components Of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 16,132	$ 18,002	$ 48,561	$ 54,191
Variable lease cost	4,204	3,630	11,256	9,927
Short-term lease cost	12,923	5,587	30,089	14,549
Sublease income	(344)	(351)	(951)	(1,077)
Net lease cost	$ 32,915	$ 26,868	$ 88,955	$ 77,590

Leases - Maturities Of Operatin

Leases - Maturities Of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2020	$ 16,550
2020		$ 66,820
2021	60,067	60,452
2022	57,241	57,363
2023	39,178	39,202
2024	6,798	6,819
Thereafter	6,125	6,251
Total lease payments	185,959	236,907
Less: imputed interest	(20,842)	(31,295)
Total operating lease liabilities	165,117	205,612
Current operating lease liabilities	52,160	53,785
Non-current operating lease liabilities	112,957	151,827
Vessels
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2020	15,018
2020		60,210
2021	54,421	54,564
2022	52,106	52,106
2023	34,580	34,580
2024	2,470	2,470
Thereafter	0	0
Total lease payments	158,595	203,930
Less: imputed interest	(15,896)	(24,846)
Total operating lease liabilities	142,699	179,084
Current operating lease liabilities	47,552	48,716
Non-current operating lease liabilities	95,147	130,368
Facilities and Equipment
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2020	1,532
2020		6,610
2021	5,646	5,888
2022	5,135	5,257
2023	4,598	4,622
2024	4,328	4,349
Thereafter	6,125	6,251
Total lease payments	27,364	32,977
Less: imputed interest	(4,946)	(6,449)
Total operating lease liabilities	22,418	26,528
Current operating lease liabilities	4,608	5,069
Non-current operating lease liabilities	$ 17,810	$ 21,459

Leases - Weighted Average Remai

Leases - Weighted Average Remaining Lease Term And Discount Rate (Details)	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Weighted average remaining lease term (in years)	3 years 3 months 18 days	4 years
Weighted average discount rate (as a percent)	7.53%	7.54%

Leases - Other Information Rela

Leases - Other Information Related To Operating Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Cash paid for operating lease liabilities	$ 49,350	$ 54,538
ROU assets obtained in exchange for new operating lease obligations	$ 36	$ 921

Business Combinations And Goo_3

Business Combinations And Goodwill (Details) $ in Millions	May 29, 2019USD ($)
STL
Business Acquisition [Line Items]
Redeemable noncontrolling interests, ownership percentage	30.00%
STL
Business Acquisition [Line Items]
Controlling interest acquired, ownership percentage	70.00%
Total consideration for business acquisition	$ 5.1

Goodwill - Changes In Carrying

Goodwill - Changes In Carrying Amount Of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Balance at beginning of year			$ 7,157
Impairment loss	$ 0	$ 0	(6,689)	$ 0
Balance at end of period	0		0
Well Intervention
Goodwill [Line Items]
Balance at beginning of year			7,157
Impairment loss			(6,689)
Other adjustments			(468)
Balance at end of period	$ 0		$ 0

Long-Term Debt - Maturities Of

Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 14, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Less than one year	$ 73,560
One to two years	70,062
Two to three years	38,333
Three to four years	8,749
Four to five years	9,186
Over five years	214,645
Gross debt	414,535
Unamortized debt discounts	(47,562)
Unamortized debt issuance costs	(10,027)
Total debt	356,946
Less: current maturities	(73,401)		$ (99,731)
Long-term debt	283,545		306,122
Term Loan Maturing December 2021
Debt Instrument [Line Items]
Less than one year	3,500
One to two years	27,125
Two to three years	0
Three to four years	0
Four to five years	0
Over five years	0
Gross debt	30,625		33,250
Unamortized debt discounts	0
Unamortized debt issuance costs	(239)
Total debt	30,386
Less: current maturities	(3,500)
Long-term debt	26,886
Convertible Senior Notes Maturing May 2022
Debt Instrument [Line Items]
Less than one year	0
One to two years	35,000
Two to three years	0
Three to four years	0
Four to five years	0
Over five years	0
Gross debt	35,000		125,000
Unamortized debt discounts	(1,560)		(8,000)
Unamortized debt issuance costs	(235)
Total debt	33,205
Less: current maturities	0
Long-term debt	33,205
Convertible Senior Notes Maturing September 2023
Debt Instrument [Line Items]
Less than one year	0
One to two years	0
Two to three years	30,000
Three to four years	0
Four to five years	0
Over five years	0
Gross debt	30,000		125,000
Unamortized debt discounts	(2,869)		(14,500)
Unamortized debt issuance costs	(462)
Total debt	26,669
Less: current maturities	0
Long-term debt	26,669
Convertible Senior Notes Maturing February 2026
Debt Instrument [Line Items]
Less than one year	0
One to two years	0
Two to three years	0
Three to four years	0
Four to five years	0
Over five years	200,000
Gross debt	200,000	$ 200,000	0
Unamortized debt discounts	(43,133)
Unamortized debt issuance costs	(5,761)
Total debt	151,106
Less: current maturities	0
Long-term debt	151,106
MARAD Debt Maturing February 2027
Debt Instrument [Line Items]
Less than one year	7,560
One to two years	7,937
Two to three years	8,333
Three to four years	8,749
Four to five years	9,186
Over five years	14,645
Gross debt	56,410		63,610
Unamortized debt discounts	0
Unamortized debt issuance costs	(3,171)
Total debt	53,239
Less: current maturities	(7,560)
Long-term debt	45,679
Nordea Q5000 Loan Maturing January 2021
Debt Instrument [Line Items]
Less than one year	62,500
One to two years	0
Two to three years	0
Three to four years	0
Four to five years	0
Over five years	0
Gross debt	62,500		$ 89,286
Unamortized debt discounts	0
Unamortized debt issuance costs	(159)
Total debt	62,341
Less: current maturities	(62,341)
Long-term debt	$ 0

Long-Term Debt - Credit Agreeme

Long-Term Debt - Credit Agreement (Details) - USD ($) $ in Thousands	Jun. 28, 2019	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount		$ 414,535
Term Loan Maturing December 2021
Debt Instrument [Line Items]
Principal amount		$ 30,625	$ 33,250
Interest rate (as a percent)		3.40%
Frequency of periodic payment		quarterly
Periodic principal payment (as a percent)		2.50%
Term Loan Maturing December 2021 | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.25%
Term Loan Maturing December 2021 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		3.25%
Revolving Credit Facility Maturing December 2021
Debt Instrument [Line Items]
Borrowing capacity		$ 175,000
Additional commitments (up to)		100,000
Available borrowing capacity		144,700
Letters of credit issued		$ 3,400
Commitment fee percentage		0.50%
Revolving Credit Facility Maturing December 2021 | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		1.50%
Revolving Credit Facility Maturing December 2021 | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.50%
Revolving Credit Facility Maturing December 2021 | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.50%
Revolving Credit Facility Maturing December 2021 | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		3.50%
Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity		$ 25,000
Credit Agreement
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2021
Credit Agreement | Collateral Pledged
Debt Instrument [Line Items]
Maximum percent of shares of foreign subsidiaries		66.00%

Long-Term Debt - Convertible Se

Long-Term Debt - Convertible Senior Notes Due 2022 (Details) $ / shares in Units, $ in Thousands	Aug. 14, 2020USD ($)	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Repurchase amount	$ 183,200
Gain on extinguishment of long-term debt		$ 9,239	$ 0	$ 9,239	$ (18)
Unamortized debt discount		47,562		47,562
Interest expense		$ 8,007	7,694	$ 22,580	23,635
Convertible Senior Notes Maturing May 2022
Debt Instrument [Line Items]
Interest rate (as a percent)		4.25%		4.25%
Frequency of periodic payment				semi-annually
Maturity date				May 1, 2022
Initial conversion ratio				0.0719748
Initial conversion price per share (in dollars per share) | $ / shares		$ 13.89		$ 13.89
Redemption price as a percentage of principal amount				100.00%
Minimum percentage in aggregate principal amount		25.00%		25.00%
Repurchased principal amount	90,000
Repurchase amount	89,100
Reacquisition of debt component	81,700
Gain on extinguishment of long-term debt	3,300
Unamortized debt discount		$ 1,560		$ 1,560		$ 8,000
Reacquisition of equity component	$ 7,400
Carrying amount of equity component		9,500		9,500		16,900
Carrying amount of equity component, net of tax		$ 5,300		$ 5,300		$ 11,000
Effective interest rate (as a percent)		7.30%		7.30%
Interest expense		$ 1,300	$ 2,100	$ 5,600	$ 6,200

Long-Term Debt - Convertible _2

Long-Term Debt - Convertible Senior Notes Due 2023 (Details) $ / shares in Units, $ in Thousands	Aug. 14, 2020USD ($)	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Repurchase amount	$ 183,200
Gain on extinguishment of long-term debt		$ 9,239	$ 0	$ 9,239	$ (18)
Unamortized debt discount		47,562		47,562
Interest expense		$ 8,007	7,694	$ 22,580	23,635
Convertible Senior Notes Maturing September 2023
Debt Instrument [Line Items]
Interest rate (as a percent)		4.125%		4.125%
Frequency of periodic payment				semi-annually
Maturity date				Sep. 15, 2023
Initial conversion ratio				0.1056133
Initial conversion price per share (in dollars per share) | $ / shares		$ 9.47		$ 9.47
Redemption price as a percentage of principal amount				100.00%
Minimum percentage in aggregate principal amount		25.00%		25.00%
Repurchased principal amount	95,000
Repurchase amount	94,100
Reacquisition of debt component	78,200
Gain on extinguishment of long-term debt	5,900
Unamortized debt discount		$ 2,869		$ 2,869		$ 14,500
Reacquisition of equity component	$ 15,900
Carrying amount of equity component		4,200		4,200		20,100
Carrying amount of equity component, net of tax		$ 3,600		$ 3,600		$ 15,900
Effective interest rate (as a percent)		7.80%		7.80%
Interest expense		$ 1,300	$ 2,100	$ 5,600	$ 6,300

Long-Term Debt - Convertible _3

Long-Term Debt - Convertible Senior Notes Due 2026 (Details) $ / shares in Units, $ in Thousands	Aug. 14, 2020USD ($)$ / shares	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Principal amount		$ 414,535		$ 414,535
Repurchase amount	$ 183,200
Interest expense		8,007	$ 7,694	22,580	$ 23,635
Unamortized debt discount		47,562		47,562
Convertible Senior Notes Maturing February 2026
Debt Instrument [Line Items]
Principal amount	200,000	200,000		$ 200,000		$ 0
Proceeds from debt, net of issuance costs	192,500
Net proceeds used to fund the cost of capped call transactions	$ 10,500
Interest rate (as a percent)	6.75%
Maturity date				Feb. 15, 2026
Frequency of periodic payment	semi-annually
Initial conversion ratio				0.1433795
Initial conversion price per share (in dollars per share) | $ / shares	$ 6.97
Redemption price as a percentage of principal amount	100.00%
Minimum percentage in aggregate principal amount	25.00%
Carrying amount of equity component		43,800		$ 43,800
Carrying amount of equity component, net of tax		$ 34,600		$ 34,600
Effective interest rate (as a percent)		12.40%		12.40%
Interest expense		$ 2,400		$ 2,400
Unamortized debt discount		43,133		43,133
Convertible Senior Notes Maturing May 2022
Debt Instrument [Line Items]
Principal amount		$ 35,000		$ 35,000		125,000
Repurchase amount	$ 89,100
Repurchased principal amount	90,000
Interest rate (as a percent)		4.25%		4.25%
Maturity date				May 1, 2022
Frequency of periodic payment				semi-annually
Initial conversion ratio				0.0719748
Initial conversion price per share (in dollars per share) | $ / shares		$ 13.89		$ 13.89
Redemption price as a percentage of principal amount				100.00%
Minimum percentage in aggregate principal amount		25.00%		25.00%
Carrying amount of equity component		$ 9,500		$ 9,500		16,900
Carrying amount of equity component, net of tax		$ 5,300		$ 5,300		11,000
Effective interest rate (as a percent)		7.30%		7.30%
Interest expense		$ 1,300	2,100	$ 5,600	6,200
Unamortized debt discount		1,560		1,560		8,000
Convertible Senior Notes Maturing September 2023
Debt Instrument [Line Items]
Principal amount		$ 30,000		$ 30,000		125,000
Repurchase amount	94,100
Repurchased principal amount	$ 95,000
Interest rate (as a percent)		4.125%		4.125%
Maturity date				Sep. 15, 2023
Frequency of periodic payment				semi-annually
Initial conversion ratio				0.1056133
Initial conversion price per share (in dollars per share) | $ / shares		$ 9.47		$ 9.47
Redemption price as a percentage of principal amount				100.00%
Minimum percentage in aggregate principal amount		25.00%		25.00%
Carrying amount of equity component		$ 4,200		$ 4,200		20,100
Carrying amount of equity component, net of tax		$ 3,600		$ 3,600		15,900
Effective interest rate (as a percent)		7.80%		7.80%
Interest expense		$ 1,300	$ 2,100	$ 5,600	$ 6,300
Unamortized debt discount		$ 2,869		$ 2,869		$ 14,500

Long-Term Debt - MARAD Debt (De

Long-Term Debt - MARAD Debt (Details) - MARAD Debt Maturing February 2027	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Guarantor obligations (as a percent)	50.00%
Frequency of periodic payment	semi-annual
Maturity date	February 2027
Interest rate (as a percent)	4.93%

Long-Term Debt - Nordea Credit

Long-Term Debt - Nordea Credit Agreement (Details) - USD ($) $ in Millions	Mar. 11, 2020	Apr. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Nordea Q5000 Loan Previously Maturing April 2020
Debt Instrument [Line Items]
Borrowing capacity				$ 250
Funded amount		$ 250
Maturity date			Apr. 30, 2020
Frequency of periodic payment			quarterly
Scheduled principal installments			$ 8.9
Balloon payment			$ 80.4
Nordea Q5000 Loan Previously Maturing April 2020 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			2.50%
Nordea Q5000 Loan Maturing January 2021
Debt Instrument [Line Items]
Maturity date	Jan. 31, 2021
Balloon payment	$ 53.6
Nordea Q5000 Loan Maturing January 2021 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.75%

Long-Term Debt - Components Of

Long-Term Debt - Components Of Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Interest expense	$ 8,007	$ 7,694	$ 22,580	$ 23,635
Interest income	(409)	(652)	(991)	(2,085)
Capitalized interest	0	(5,141)	(1,182)	(15,346)
Net interest expense	$ 7,598	$ 1,901	$ 20,407	$ 6,204

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020USD ($)numberOfForeignSubsidiaries	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Net tax benefit from CARES Act			$ 7.6
Current tax benefit from CARES Act			18.9
Deferred tax expense from CARES Act			$ 11.3
Number of foreign subsidiaries | numberOfForeignSubsidiaries			2
Net deferred tax benefits from foreign subsidiary restructuring			$ 8.3
Effective tax rate	17.60%	10.10%	9777.00%	11.90%

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Taxes at U.S. statutory rate	$ 6,232	$ 7,384	$ (35)	$ 11,866
Foreign tax provision	1,088	(3,574)	(28)	(5,488)
CARES Act	(2,362)	0	(7,596)	0
Subsidiary restructuring	0	0	(8,333)	0
Other	274	(271)	(140)	361
Income tax provision (benefit)	$ 5,232	$ 3,539	$ (16,132)	$ 6,739
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Taxes at U.S. statutory rate	21.00%	21.00%	21.00%	21.00%
Foreign tax provision	3.70%	(10.10%)	17.00%	(9.70%)
CARES Act	(8.00%)	0.00%	4603.60%	0.00%
Subsidiary restructuring	0.00%	0.00%	5050.30%	0.00%
Other	0.90%	(0.80%)	85.10%	0.60%
Income tax provision (benefit)	17.60%	10.10%	9777.00%	11.90%

Shareholders' Equity - Componen

Shareholders' Equity - Components Of Accumulated OCI (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative foreign currency translation adjustment	$ (80,512)	$ (64,455)
Net unrealized loss on hedges, net of tax	0	(285)
Accumulated OCI	$ (80,512)	$ (64,740)

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020USD ($)shares	Sep. 30, 2020USD ($)$ / sharesshares
Option Indexed to Issuer's Equity [Line Items]
Aggregate cost of capped call transactions | $	$ (10,625)	$ (10,625)
2026 Capped Calls
Option Indexed to Issuer's Equity [Line Items]
Aggregate number of common shares subject to capped calls | shares	28,675,900	28,675,900
Initial strike price | $ / shares		$ 6.97
Initial cap price | $ / shares		$ 8.42
Aggregate cost of capped call transactions | $		$ 10,600

Revenue From Contracts With C_3

Revenue From Contracts With Customers - Disaggregation Of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net revenues	$ 193,490	$ 212,609	$ 573,658	$ 581,160
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(11,282)	(23,283)	(32,835)	(51,398)
Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues	140,803	170,206	427,296	451,511
Well Intervention | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(4,120)	(15,318)	(11,334)	(28,355)
Robotics
Disaggregation of Revenue [Line Items]
Net revenues	49,802	51,909	135,896	136,396
Robotics | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(7,162)	(7,965)	(21,501)	(23,043)
Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues	14,167	13,777	43,301	44,651
Short-term
Disaggregation of Revenue [Line Items]
Net revenues	75,689	79,827	271,906	226,051
Short-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Short-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues	46,907	53,018	184,599	145,611
Short-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues	28,782	26,809	87,307	80,440
Short-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Long-term
Disaggregation of Revenue [Line Items]
Net revenues	117,801	132,782	301,752	355,109
Long-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(11,282)	(23,283)	(32,835)	(51,398)
Long-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues	93,896	117,188	242,697	305,900
Long-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues	21,020	25,100	48,589	55,956
Long-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues	$ 14,167	$ 13,777	$ 43,301	$ 44,651

Revenue From Contracts With C_4

Revenue From Contracts With Customers - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract assets	$ 1.9		$ 1.9		$ 0.7
Contract liabilities	12.8		12.8		19.9
Revenue recognized	3.4	$ 4	8.8	$ 7.4
Deferred contract costs	26.1		26.1		$ 42.9
Amortization of deferred contract costs	$ 9.2	$ 7.7	$ 27.2	$ 23.6

Revenue From Contracts With C_5

Revenue From Contracts With Customers - Remaining Performance Obligations (Details) $ in Millions	Sep. 30, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Unsatisfied performance obligations	$ 480.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue from Contract with Customer [Abstract]
Unsatisfied performance obligations	$ 129.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Unsatisfied performance obligations	$ 247
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Unsatisfied performance obligations	$ 104
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction

Earnings Per Share - Computatio

Earnings Per Share - Computations Of Basic And Diluted EPS (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic:
Net income attributable to common shareholders	$ 24,499	$ 31,695	$ 18,011	$ 49,867
Less: Undistributed earnings allocated to participating securities	(180)	(261)	(117)	(435)
Accretion of redeemable noncontrolling interests	(128)	(25)	(2,283)	(43)
Net income available to common shareholders, basic	$ 24,191	$ 31,409	$ 15,611	$ 49,389
Weighted average number of shares outstanding, basic (in shares)	149,032	147,575	148,956	147,506
Effect of dilutive securities:
Net income available to common shareholders, basic	$ 24,191	$ 31,409	$ 15,611	$ 49,389
Share-based awards other than participating securities	$ 0	$ 0	$ 0	$ 0
Share-based awards other than participating securities (in shares)	919	779	868	580
Undistributed earnings reallocated to participating securities	$ 2	$ 1	$ 1	$ 2
Net income available to common shareholders, diluted	$ 24,193	$ 31,410	$ 15,612	$ 49,391
Weighted average number of shares outstanding, diluted (in shares)	149,951	148,354	149,824	148,086

Earnings Per Share - Potentiall

Earnings Per Share - Potentially Dilutive Shares Excluded From Diluted EPS Calculation (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Convertible Senior Notes Maturing May 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	5,688	8,997	7,886	8,997
Convertible Senior Notes Maturing September 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	8,076	13,202	11,481	13,202
Convertible Senior Notes Maturing February 2026
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	14,650	0	4,919	0

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution (as a percent)				50.00%
Employer matching contribution percent of employees' salary (up to)				5.00%
2005 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)		7,000,000		7,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation		$ 1.1	$ 1.2	$ 3.2	$ 4.9
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation		1	1.2	$ 3	3.9
Share-based payment awards vested (in shares)	589,335
Award vesting percentage	200.00%
Vesting period				3 years
Performance Share Units | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment awards vested (in shares)	1,178,670
Fair value of awards vested	$ 11.4
Fixed Value Cash Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive cash awards granted		4.7		$ 4.7		$ 4.6
Vesting period				3 years
Compensation expense		$ 1.1	$ 0.8	$ 3.4	$ 2.4
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)		1,800,000		1,800,000
Purchase limit per employee (in shares)				260

Employee Benefit Plans - Share-

Employee Benefit Plans - Share-Based Awards Granted (Details) - $ / shares	1 Months Ended	9 Months Ended
	Jan. 31, 2020	Sep. 30, 2020
Performance Share Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting Percentage	200.00%
Vesting Period		3 years
Maximum | Performance Share Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting Percentage		200.00%
Minimum | Performance Share Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting Percentage		0.00%
January 2, 2020 - 33% Per Year over Three Years
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Date of Grant		Jan. 2, 2020
Shares/ Units		369,938
Grant Date Fair Value Per Share/Unit		$ 9.63
Vesting Percentage		33.00%
Vesting Period		3 years
January 2, 2020 - 100% on January 2, 2023
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Date of Grant		Jan. 2, 2020
Shares/ Units		369,938
Grant Date Fair Value Per Share/Unit		$ 13.15
Vesting Percentage		100.00%
Vesting Date		Jan. 2, 2023
January 2, 2020 - 100% on January 1, 2022
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Date of Grant		Jan. 2, 2020
Shares/ Units		5,679
Grant Date Fair Value Per Share/Unit		$ 9.63
Vesting Percentage		100.00%
Vesting Date		Jan. 1, 2022
April 1, 2020 - 100% on January 1, 2022
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Date of Grant		Apr. 1, 2020
Shares/ Units		43,351
Grant Date Fair Value Per Share/Unit		$ 1.64
Vesting Percentage		100.00%
Vesting Date		Jan. 1, 2022
July 1, 2020 - 100% on January 1, 2022
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Date of Grant		Jul. 1, 2020
Shares/ Units		19,407
Grant Date Fair Value Per Share/Unit		$ 3.47
Vesting Percentage		100.00%
Vesting Date		Jan. 1, 2022

Business Segment Information -

Business Segment Information - Narrative (Details)	9 Months Ended
	Sep. 30, 2020vesselsegment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Robotics
Segment Reporting Information [Line Items]
Number of long-term chartered vessels | vessel	2

Business Segment Information _2

Business Segment Information - Financial Data By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net revenues	$ 193,490	$ 212,609	$ 573,658	$ 581,160
Income from operations	19,015	38,998	12,182	62,339
Goodwill impairment	0	0	(6,689)	0
Reportable Segments
Segment Reporting Information [Line Items]
Income from operations	29,961	49,615	47,992	93,830
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(11,282)	(23,283)	(32,835)	(51,398)
Corporate, Eliminations and Other
Segment Reporting Information [Line Items]
Income from operations	(10,946)	(10,617)	(29,121)	(31,491)
Well Intervention
Segment Reporting Information [Line Items]
Net revenues	140,803	170,206	427,296	451,511
Goodwill impairment			(6,689)
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	140,803	170,206	427,296	451,511
Income from operations	18,844	37,689	24,910	74,002
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(4,120)	(15,318)	(11,334)	(28,355)
Robotics
Segment Reporting Information [Line Items]
Net revenues	49,802	51,909	135,896	136,396
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	49,802	51,909	135,896	136,396
Income from operations	6,983	8,876	11,940	7,921
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(7,162)	(7,965)	(21,501)	(23,043)
Production Facilities
Segment Reporting Information [Line Items]
Net revenues	14,167	13,777	43,301	44,651
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	14,167	13,777	43,301	44,651
Income from operations	$ 4,134	$ 3,050	$ 11,142	$ 11,907

Business Segment Information _3

Business Segment Information - Intercompany Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net revenues	$ (193,490)	$ (212,609)	$ (573,658)	$ (581,160)
Well Intervention
Segment Reporting Information [Line Items]
Net revenues	(140,803)	(170,206)	(427,296)	(451,511)
Robotics
Segment Reporting Information [Line Items]
Net revenues	(49,802)	(51,909)	(135,896)	(136,396)
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	11,282	23,283	32,835	51,398
Intercompany Eliminations | Well Intervention
Segment Reporting Information [Line Items]
Net revenues	4,120	15,318	11,334	28,355
Intercompany Eliminations | Well Intervention | Production Facilities
Segment Reporting Information [Line Items]
Net revenues		10,600		15,900
Intercompany Eliminations | Robotics
Segment Reporting Information [Line Items]
Net revenues	$ 7,162	$ 7,965	$ 21,501	$ 23,043

Business Segment Information _4

Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 2,505,474	$ 2,596,731
Corporate and Other
Segment Reporting Information [Line Items]
Total assets	118,269	122,449
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	2,110,889	2,180,180
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	142,538	151,478
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	$ 133,778	$ 142,624

Asset Retirement Obligations -

Asset Retirement Obligations - Asset Retirement Obligations (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	$ 28,258
Accretion expense	2,021
Balance at end of period	$ 30,279

Commitments And Contingencies_2

Commitments And Contingencies And Other Matters - Narrative (Details)	9 Months Ended
	Sep. 30, 2020
Siem Helix 1 and Siem Helix 2
Commitments And Contingencies [Line Items]
Term of charter agreement	7 years

Statement Of Cash Flow Inform_3

Statement Of Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Supplemental Cash Flow Information [Abstract]
Interest paid, net of interest capitalized	$ 14,255	$ 2,404
Income taxes paid	$ 6,436	$ 7,535

Statement Of Cash Flow Inform_4

Statement Of Cash Flow Information - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Non-cash capital additions	$ 1.2	$ 10.2

Allowance For Credit Losses - A

Allowance For Credit Losses - Activities In Allowance For Credit Losses (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 0
Initial adoption of ASU 2016-13 (Note 1)	785
Provision for current expected credit losses	2,387
Balance at end of period	3,172
Robotics
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision for current expected credit losses	$ 1,700

Fair Value Measurements - Asset

Fair Value Measurements - Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - Fair Value, Measurements, Recurring $ in Thousands	Dec. 31, 2019USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net liability	$ 958
Foreign Exchange Contracts | Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	401
Foreign Exchange Contracts | Non-Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	601
Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	44
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net liability	0
Level 1 | Foreign Exchange Contracts | Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0
Level 1 | Foreign Exchange Contracts | Non-Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0
Level 1 | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net liability	958
Level 2 | Foreign Exchange Contracts | Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	401
Level 2 | Foreign Exchange Contracts | Non-Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	601
Level 2 | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	44
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total net liability	0
Level 3 | Foreign Exchange Contracts | Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0
Level 3 | Foreign Exchange Contracts | Non-Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0
Level 3 | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 0

Fair Value Measurements - Princ

Fair Value Measurements - Principal Amount And Estimated Fair Value Of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 14, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	$ 414,535
Term Loan Maturing December 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	30,625		$ 33,250
Fair value	30,051		32,959
Nordea Q5000 Loan Maturing January 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	62,500		89,286
Fair value	62,656		89,398
MARAD Debt Maturing February 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	56,410		63,610
Fair value	62,551		68,643
Convertible Senior Notes Maturing May 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	35,000		125,000
Fair value	33,075		134,225
Convertible Senior Notes Maturing September 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	30,000		125,000
Fair value	27,300		162,188
Convertible Senior Notes Maturing February 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	200,000	$ 200,000	0
Fair value	160,626		0
Total Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	414,535		436,146
Fair value	$ 376,259		$ 487,413

Derivative Instruments And He_3

Derivative Instruments And Hedging Activities - Narrative (Details) $ in Millions	Jun. 30, 2015USD ($)
Interest Rate Swaps | Nordea Q5000 Loan Previously Maturing April 2020
Derivative [Line Items]
Notional amount	$ 187.5

Derivative Instruments And He_4

Derivative Instruments And Hedging Activities - Derivative Instruments Designated As Hedging Instruments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Derivatives, Fair Value [Line Items]
Asset derivative instruments designated as hedging instruments	$ 44
Liability derivative instruments designated as hedging instruments	401
Other Current Assets | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Asset derivative instruments designated as hedging instruments	44
Accrued Liabilities | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Liability derivative instruments designated as hedging instruments	$ 401

Derivative Instruments And He_5

Derivative Instruments And Hedging Activities - Derivative Instruments Not Designated As Hedging Instruments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Derivative [Line Items]
Liability derivative instruments not designated as hedging instruments	$ 601
Accrued Liabilities | Foreign Exchange Contracts
Derivative [Line Items]
Liability derivative instruments not designated as hedging instruments	$ 601

Derivative Instruments And He_6

Derivative Instruments And Hedging Activities - Unrealized Gain (Loss) Recognized In OCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) Recognized in OCI	$ 0	$ (274)	$ (95)	$ (701)
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) Recognized in OCI	0	(280)	(54)	(338)
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) Recognized in OCI	$ 0	$ 6	$ (41)	$ (363)

Derivative Instruments And He_7

Derivative Instruments And Hedging Activities - Gain (Loss) Reclassified From Accumulated OCI Into Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Earnings	$ 0	$ (1,046)	$ (452)	$ (4,867)
Foreign Exchange Contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Earnings	0	(1,197)	(455)	(5,460)
Interest Rate Swaps | Net Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Earnings	$ 0	$ 151	$ 3	$ 593

Derivative Instruments And He_8

Derivative Instruments And Hedging Activities - Impact Of Derivative Instruments Not Designated As Hedging Instruments On Condensed Consolidated Statements Of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Earnings	$ 0	$ (371)	$ (81)	$ (413)
Foreign Exchange Contracts | Other Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Earnings	$ 0	$ (371)	$ (81)	$ (413)