Seacor (CKH) 10-K 28 Feb 20 2019 FY Annual report Financial data

Document Cover (Details)

Document Cover (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 25, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	1-12289
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3542736
Entity Address, Address Line One	2200 Eller Drive, P.O. Box 13038
Entity Address, City or Town	Fort Lauderdale
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33316
City Area Code	954
Local Phone Number	523-2200
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	CKH
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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 Public Float			$ 821,127,160
Entity Common Stock, Shares Outstanding		20,179,162
Entity Registrant Name	SEACOR HOLDINGS INC /NEW/
Entity Central Index Key	0000859598
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false

Document Cover

Document Cover	12 Months Ended
	Dec. 31, 2019
Cover page.
Documents Incorporated by Reference	Portions of the Registrant’s definitive proxy statement for its 2020 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission (the “Commission”) pursuant to Regulation 14A within 120 days after the end of the Registrant’s last fiscal year is incorporated by reference into Part III of this Annual Report on Form 10-K.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 77,222	$ 144,221
Restricted cash and restricted cash equivalents	1,222	2,991
Marketable securities	7,936	30,316
Receivables:
Trade, net of allowance for doubtful accounts of $2,871 and $3,481 in 2019 and 2018, respectively	194,022	171,828
Trade receivables, allowance for doubtful accounts	2,871	3,481
Other	38,881	38,881
Inventories	5,255	4,530
Prepaid expenses and other	6,971	5,382
Total current assets	331,509	398,149
Property and Equipment:
Historical cost	1,442,382	1,407,329
Accumulated depreciation	(624,024)	(560,819)
Net property and equipment	818,358	846,510
Operating Lease Right-of-Use Assets	144,539
Investments, at Equity, and Advances to 50% or Less Owned Companies	157,108	156,886
Construction Reserve Funds	0	3,908
Goodwill	32,701	32,708
Intangible Assets, Net	20,996	24,551
Other Assets	7,761	8,312
Total Assets	1,512,972	1,471,024
Current Liabilities:
Current portion of long-term debt	58,854	8,497
Current portion of long-term operating lease liabilities	36,011
Accounts payable and accrued expenses	57,595	59,607
Accrued wages and benefits	20,730	21,203
Accrued interest	1,030	1,184
Accrued capital, repair and maintenance expenditures	3,213	3,254
Other current liabilities	32,528	30,018
Total current liabilities	209,961	123,763
Long-Term Debt	255,612	346,128
Long-term operating lease liabilities	108,295
Deferred Income Taxes	105,661	94,420
Deferred Gains and Other Liabilities	20,929	52,871
Total liabilities	700,458	617,182
SEACOR Holdings Inc. stockholders’ equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized; none issued nor outstanding	$ 0	0
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000
Common stock, $0.01 par value, 60,000,000 shares authorized; 40,819,892 and 39,001,924 shares issued in 2019 and 2018, respectively	$ 408	$ 390
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	60,000,000
Common stock, shares issued (in shares)	40,819,892	39,001,924
Additional paid-in capital	$ 1,661,002	$ 1,596,642
Retained earnings	517,106	474,809
Shares held in treasury of 20,643,724 and 20,671,627 in 2019 and 2018, respectively, at cost	$ (1,365,792)	$ (1,366,773)
Treasury stock, shares (in shares)	20,643,724	20,671,627
Accumulated other comprehensive loss, net of tax	$ (998)	$ (914)
Stockholders' equity attributable to SEACOR Holdings Inc.	811,726	704,154
Noncontrolling interests in subsidiaries	788	149,688
Total equity	812,514	853,842
Liabilities and stockholders' equity, total	$ 1,512,972	$ 1,471,024

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Operating Revenues	$ 799,966	$ 835,750	$ 650,847
Costs and Expenses:
Operating	583,633	591,848	433,837
Administrative and general	105,517	102,907	103,106
Depreciation and amortization	68,571	74,579	75,058
Total costs and expenses	757,721	769,334	612,001
Gains on Asset Dispositions and Impairments, Net	2,910	19,583	11,637
Operating Income	45,155	85,999	50,483
Other Income (Expense):
Interest income	7,471	8,730	8,547
Interest expense	(19,233)	(31,683)	(41,530)
Debt extinguishment losses, net	(2,244)	(11,626)	(819)
Marketable security gains (losses), net	18,394	(12,431)	(1,782)
Derivative gains	0	0	19,727
Foreign currency gains (losses), net	(312)	(2,264)	323
Other, net	(134)	54,964	256
Nonoperating Income (Expense)	3,942	5,690	(15,278)
Income from Continuing Operations Before Income Tax Expense (Benefit) and Equity in Earnings (Losses) of 50% or Less Owned Companies	49,097	91,689	35,205
Income Tax Expense (Benefit):
Current	1,660	23,928	(15,712)
Deferred	8,169	(15,513)	(51,477)
Income tax expense (benefit)	9,829	8,415	(67,189)
Income from Continuing Operations Before Equity in Earnings (Losses) of 50% or Less Owned Companies	39,268	83,274	102,394
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax	(5,250)	(72)	2,952
Income from Continuing Operations	34,018	83,202	105,346
Loss from Discontinued Operations, Net of Tax	0	0	(23,637)
Net Income	34,018	83,202	81,709
Net Income attributable to Noncontrolling Interests in Subsidiaries	7,244	25,054	20,066
Net Income attributable to SEACOR Holdings Inc.	26,774	58,148	61,643
Net Income (Loss) attributable to SEACOR Holdings Inc.:
Continuing Operations	26,774	58,148	82,849
Discontinued Operations	$ 0	$ 0	$ (21,206)
Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc.:
Continuing Operations (in dollars per share)	$ 1.41	$ 3.22	$ 4.77
Discontinued Operations (in dollars per share)	0	0	(1.22)
Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. (in dollars per share)	1.41	3.22	3.55
Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc.:
Continuing Operations (in dollars per share)	1.38	3.04	4.24
Discontinued Operations (in dollars per share)	0	0	(0.93)
Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. (in dollars per share)	$ 1.38	$ 3.04	$ 3.31
Weighted Average Common Shares Outstanding:
Basic (in shares)	18,949,981	18,080,778	17,368,081
Diluted (in shares)	20,306,332	19,575,689	22,934,158

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income	$ 34,018	$ 83,202	$ 81,709
Other Comprehensive Income (Loss):
Foreign currency translation gains (losses), net	(83)	(406)	1,965
Reclassification of foreign currency translation losses to foreign currency gains (losses), net	0	15	0
Derivative gains (losses) on cash flow hedges	67	0	(389)
Other	0	0	(11)
Other comprehensive income (loss)	(16)	(391)	1,707
Income tax (expense) benefit	(68)	22	(702)
Other comprehensive income (loss), net of tax	(84)	(369)	1,005
Comprehensive Income	33,934	82,833	82,714
Comprehensive Income attributable to Noncontrolling Interests in Subsidiaries	7,244	25,054	20,227
Comprehensive Income attributable to SEACOR Holdings Inc.	26,690	57,779	62,487
Interest Expense
Other Comprehensive Income (Loss):
Reclassification of derivative losses on cash flow hedges	0	0	33
Equity Method Investments
Other Comprehensive Income (Loss):
Reclassification of derivative losses on cash flow hedges	$ 0	$ 0	$ 109

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interests in Subsidiaries
Total equity, beginning balance at Dec. 31, 2016	$ 1,196,268	$ 379	$ 1,518,635	$ 910,723	$ (1,357,331)	$ (11,514)	$ 135,376
Issuance of common stock:
Employee Stock Purchase Plan	1,443				1,443
Exercise of stock options	21,154	6	21,148
Director stock awards	83		83
Restricted stock	0	2	(2)
Exercise of conversion option in convertible debt	3		3
Distribution of SEACOR Marine stock to shareholders	(527,691)		2,656	(521,859)		10,125	(18,613)
Distribution of Dorian shares to shareholders	(31,379)			(31,379)
Purchase of conversion option in convertible debt, net of tax	(927)		(927)
Purchase of treasury shares	(12,300)				(12,300)
Amortization of share awards	32,419		32,419
Cancellation of restricted stock	0		112		(112)
Purchase of subsidiary shares from noncontrolling interests, net of tax	(3,693)		(1,114)				(2,579)
Acquisition of a subsidiary with noncontrolling interests	17,374						17,374
Disposition of subsidiary with noncontrolling interests	(14,673)						(14,673)
Distributions to noncontrolling interests	(7,434)						(7,434)
Net Income	81,709			61,643			20,066
Other comprehensive income (loss)	1,005					844	161
Total equity, ending balance at Dec. 31, 2017	753,361	387	1,573,013	419,128	(1,368,300)	(545)	129,678
Issuance of common stock:
Employee Stock Purchase Plan	1,527				1,527
Exercise of stock options	6,883	2	6,881
Director stock awards	140		140
Restricted stock	0	1	(1)
Distribution of Dorian shares to shareholders	0
Net issuance of conversion option on exchange of convertible debt, net of tax	12,735		12,735
Purchase of conversion option in convertible debt, net of tax	(33)		(33)
Amortization of share awards	3,907		3,907
Purchase of subsidiary shares from noncontrolling interests, net of tax	(29)						(29)
Acquisition of a subsidiary with noncontrolling interests	96						96
Distributions to noncontrolling interests	(5,111)						(5,111)
Net Income	83,202			58,148			25,054
Other comprehensive income (loss)	(369)					(369)
Total equity, ending balance at Dec. 31, 2018	853,842	390	1,596,642	474,809	(1,366,773)	(914)	149,688
Issuance of common stock:
Employee Stock Purchase Plan	1,695				1,695
Exercise of stock options	5,244	1	5,243
Director stock awards	97		97
Restricted stock	0	2	(2)
Distribution of Dorian shares to shareholders	0
Purchase of conversion option in convertible debt, net of tax	(115)		(115)
Purchase of treasury shares	(525)				(525)
Amortization of share awards	5,134		5,134
Cancellation of restricted stock	0		189		(189)
Purchase of subsidiary shares from noncontrolling interests, net of tax	(106,989)	(15)	(53,814)				160,818
Distributions to noncontrolling interests	(5,162)						(5,162)
Net Income	34,018			26,774			7,244
Other comprehensive income (loss)	(84)					(84)
Total equity, ending balance at Dec. 31, 2019	$ 812,514	$ 408	$ 1,661,002	$ 517,106	$ (1,365,792)	$ (998)	$ 788

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities of Continuing Operations:
Income from Continuing Operations	$ 34,018,000	$ 83,202,000	$ 105,346,000
Adjustments to reconcile income from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation and amortization	68,571,000	74,579,000	75,058,000
Amortization of operating lease right-of-use assets	42,863,000
Amortization of deferred gains on sale leaseback transactions	0	(12,774,000)	(15,035,000)
Debt discount and issuance cost amortization, net	6,484,000	7,829,000	12,997,000
Amortization of share awards	5,134,000	3,907,000	32,419,000
Director stock awards	97,000	140,000	83,000
Bad debt expense (income)	2,021,000	2,067,000	(175,000)
Gains on asset dispositions and impairments, net	(2,910,000)	(19,583,000)	(11,637,000)
Debt extinguishment losses, net	2,244,000	11,626,000	819,000
Marketable security (gains) losses, net	(18,394,000)	12,431,000	1,782,000
Purchases of marketable securities	(5,752,000)	0	(1,720,000)
Proceeds from sale of marketable securities	46,526,000	14,000	674,000
Derivative gains	0	0	(19,727,000)
Cash settlements on derivative transactions, net	0	0	255,000
Foreign currency (gains) losses, net	312,000	2,264,000	(323,000)
Deferred income tax expense (benefit)	8,169,000	(15,513,000)	(51,477,000)
Equity in (earnings) losses of 50% or less owned companies, net of tax	5,250,000	72,000	(2,952,000)
Dividends received from 50% or less owned companies	100,000	5,907,000	12,891,000
Other, net	0	(53,902,000)	0
Changes in operating assets and liabilities:
(Increase) decrease in receivables	(30,385,000)	(63,764,000)	2,195,000
Increase in prepaid expenses and other assets	(6,698,000)	(1,577,000)	(8,174,000)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(38,377,000)	12,503,000	(25,724,000)
Net cash provided by operating activities of continuing operations	119,273,000	49,428,000	107,575,000
Cash Flows from Investing Activities of Continuing Operations:
Purchases of property and equipment	(37,786,000)	(50,272,000)	(114,595,000)
Proceeds from disposition of property and equipment	2,452,000	16,100,000	164,789,000
Investments in and advances to 50% or less owned companies	(5,960,000)	(20,586,000)	(9,663,000)
Return of investments and advances from 50% or less owned companies	3,677,000	8,988,000	15,568,000
Proceeds on sale of 50% or less owned companies	0	78,015,000	0
Proceeds on sale of a controlling interest in a subsidiary	0	0	5,000,000
Payments received on third party leases and notes receivable, net	1,141,000	506,000	24,485,000
Deposits into construction reserve funds	0	0	(13,807,000)
Withdrawals from construction reserve funds	3,908,000	47,431,000	38,221,000
Business acquisitions, net of cash acquired	0	310,000	5,868,000
Net cash provided by (used in) investing activities of continuing operations	(32,568,000)	80,492,000	115,866,000
Cash Flows from Financing Activities of Continuing Operations:
Payments on long-term debt	169,625,000	225,541,000
Repayments of Debt and Capital Lease Obligations			303,485,000
Proceeds from issuance of long-term debt, net of offering costs	120,740,000	(2,495,000)	44,900,000
Purchase of conversion option in convertible debt	(146,000)	(33,000)	(1,354,000)
Common stock acquired for treasury	(525,000)	0	(12,300,000)
Proceeds and tax benefits from share award plans	6,939,000	8,410,000	22,597,000
Purchase of subsidiary shares from noncontrolling interests	(107,692,000)	(29,000)	0
Distributions to noncontrolling interests	5,162,000	5,111,000	4,000
Net cash used in financing activities of continuing operations	(155,471,000)	(224,799,000)	(249,646,000)
Effects of Exchange Rate Changes on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(2,000)	(137,000)	956,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Period Increase (Decrease), Including Exchange Rate Effect, Continuing Operations	(68,768,000)	(95,016,000)	(25,249,000)
Cash Flows from Discontinued Operations:
Operating Activities	0	0	12,811,000
Investing Activities	0	0	2,720,000
Financing Activities	0	0	(7,149,000)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	0	0	208,000
Net Increase in Cash and Cash Equivalents from Discontinued Operations	0	0	8,590,000
Net Decrease in Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(68,768,000)	(95,016,000)	(16,659,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Year	147,212,000	242,228,000	258,887,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Year	78,444,000	147,212,000	242,228,000
Restricted Cash and Restricted Cash Equivalents, End of Year	1,222,000	2,991,000	2,982,000
Cash and Cash Equivalents, End of Year	$ 77,222,000	$ 144,221,000	$ 239,246,000

Supplemental Information For St

Supplemental Information For Statements Of Cash Flows	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Supplemental Information For Statements Of Cash Flows	20. SUPPLEMENTAL INFORMATION FOR STATEMENTS OF CASH FLOWS Supplemental information for the years ended December 31, was as follows (in thousands): 2019 2018 2017 Income taxes paid $ 7,708 $ 27,465 $ 6,152 Income taxes refunded 11,156 299 14,347 Interest paid, excluding capitalized interest 12,903 26,880 32,341 Schedule of Non-Cash Investing and Financing Activities: Right-of-use assets obtained in exchange for operating lease liabilities 179,944 — — Net issuance of conversion option on exchange of convertible debt — 16,120 — Distribution of Dorian shares to shareholders — — 31,379 Reclassification of deferred gains to property and equipment — 3,052 5,954 Equipment received as a dividend from 50% or less owned companies 589 — —

Supplemental Information For _2

Supplemental Information For Statements Of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash Flow Supplemental Information	Supplemental information for the years ended December 31, was as follows (in thousands): 2019 2018 2017 Income taxes paid $ 7,708 $ 27,465 $ 6,152 Income taxes refunded 11,156 299 14,347 Interest paid, excluding capitalized interest 12,903 26,880 32,341 Schedule of Non-Cash Investing and Financing Activities: Right-of-use assets obtained in exchange for operating lease liabilities 179,944 — — Net issuance of conversion option on exchange of convertible debt — 16,120 — Distribution of Dorian shares to shareholders — — 31,379 Reclassification of deferred gains to property and equipment — 3,052 5,954 Equipment received as a dividend from 50% or less owned companies 589 — —

Supplemental Information For _3

Supplemental Information For Statements Of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Income taxes paid	$ 7,708	$ 27,465	$ 6,152
Income taxes refunded	11,156	299	14,347
Interest paid, excluding capitalized interest	12,903	26,880	32,341
Schedule of Non-Cash Investing and Financing Activities:
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	179,944
Net issuance of conversion option on exchange of convertible debt	0	16,120	0
Distribution of Dorian shares to shareholders	0	0	31,379
Reclassification of deferred gains to property and equipment	0	3,052	5,954
Equipment received as a dividend from 50% or less owned companies	$ 589	$ 0	$ 0

Nature Of Operations And Accoun

Nature Of Operations And Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Nature Of Operations And Accounting Policies	1. NATURE OF OPERATIONS AND ACCOUNTING POLICIES Nature of Operations and Segmentation. SEACOR Holdings Inc. (“SEACOR”) and its subsidiaries (collectively referred to as the “Company”) are a diversified holding company with interests in domestic and international transportation and logistics, risk management consultancy and other businesses. Accounting standards require public business enterprises to report information about each of their operating business segments that exceed certain quantitative thresholds or meet certain other reporting requirements. Operating business segments have been defined as a component of an enterprise about which separate financial information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company has identified the following reporting segments: Ocean Transportation & Logistics Services (“Ocean Services”). Ocean Services owns and operates a diversified fleet of bulk transportation, port and infrastructure, and logistics assets, including U.S. coastwise eligible vessels and vessels trading internationally. Ocean Services owns and operates U.S.-flag petroleum and chemical carriers servicing the U.S. coastwise crude oil, petroleum products and chemical trades. Ocean Services’ dry bulk vessels also operate in the U.S. coastwise trade. Ocean Services’ port and infrastructure services assist deep-sea vessels docking in U.S. Gulf and East Coast ports, providing ocean towing services between U.S. ports and providing oil terminal support and bunkering operations in St. Eustatius and the Bahamas. Ocean Services’ logis tics services include U.S.-flag Pure Car/Truck Carriers (“PCTCs”) operating globally under the U.S. Maritime Security Program (“MSP”) and liner, short-sea, rail car and project cargo transportation and logistics solutions to and from ports in the Southeastern United States, the Caribbean (including Puerto Rico), the Bahamas and Mexico. Ocean Services also provides technical ship management services for third-party vessel owners. Ocean Services contributed 53%, 50% and 54% of the Company's consolidated operating revenues during the years ended December 31, 2019, 2018 and 2017, respectively. During the year ended December 31, 2019, one Ocean Services (U.S. Federal Government) customer accounted for $79.6 million, or 10%, of the Company's consolidated operating revenues. Inland Transportation & Logistics Services (“Inland Services”). Inland Services markets and operates domestic river transportation equipment, and owns fleeting and high-speed multi-modal terminal locations adjacent to and along the U.S. Inland Waterways, primarily in the St. Louis, Memphis and Baton Rouge areas. Inland Services’ barges are primarily used for moving agricultural and industrial commodities and containers on the U.S. Inland Waterways, the Mississippi River, Illinois River, Tennessee River, Ohio River and their tributaries and the Gulf Intracoastal Waterways. Internationally, Inland Services also owns inland river liquid tank barges that operate on the Magdalena River in Colombia. These barges primarily transport petroleum products. Inland Services also has a 50% interest in dry-cargo barge operations on the Parana-Paraguay Waterway in Brazil, Bolivia, Paraguay, Argentina and Uruguay primarily transporting agricultural and industrial commodities, a 63% interest in towboat operations on the U.S. Inland Waterways and a 50% interest in grain terminals/elevators along the U.S. Inland waterways. Inland Services contributed 33%, 34% and 38% of the Company's consolidated operating revenues during the years ended December 31, 2019, 2018 and 2017, respectively. Witt O’Brien’s. Witt O’Brien’s provides crisis and emergency management services for both the public and private sectors. These services strengthen clients’ resilience and assist their response to natural and man-made disasters by enhancing their ability to prepare for, respond to and recover from such disasters, while mitigating the impact of future disruptions on operations and helping communities build back stronger. Witt O’Brien’s contributed 13%, 16% and 8% of the Company's consolidated operating revenues during the years ended December 31, 2019, 2018 and 2017, respectively. Other. The Company’s Other business segment includes CLEANCOR Energy Solutions LLC (“Cleancor”), a full service provider that designs, develops and maintains alternative energy and power solutions for end users looking to displace legacy petroleum-based fuels and adopt energy supplies that have a favorable environmental footprint. Cleancor provides liquefied natural gas (“LNG”) and compressed natural gas (“CNG”) fuel supply and logistics to commercial, industrial, agricultural and transportation customers and provides natural gas during pipeline supply interruptions due to planned maintenance or other curtailments (see Note 2). Other also has activities that primarily include noncontrolling investments in various other businesses, primarily sales, storage, and maintenance support for general aviation in Asia and an agricultural commodity trading and logistics business that is primarily focused on the global origination, and trading and merchandising of sugar and other commodities. Discontinued Operations. The Company reports the historical financial position, results of operations and cash flows of disposed businesses as discontinued operations when it has no continuing interest in the business. On June 1, 2017, the Company completed the spin-off of SEACOR Marine Holdings Inc. (“SEACOR Marine”), the company that operated SEACOR’s Offshore Marine Services business segment, by means of a dividend of all the issued and outstanding common stock of SEACOR Marine to SEACOR’s shareholders (the “Spin-off”). SEACOR Marine is now an independent company whose common stock is listed on the New York Stock Exchange under the symbol “SMHI.” For all periods presented herein, the Company has reported the historical results of operations and cash flows of SEACOR Marine as discontinued operations (see Note 19). On July 3, 2017, the Company completed the sale of its 70% interest in Illinois Corn Processing LLC (“ICP”), the company that operated SEACOR’s Illinois Corn Processing business segment. The Company received $21.0 million in cash and a note from the buyer for $32.8 million, after working capital adjustments, resulting in a gain of $10.9 million, net of tax. On September 15, 2017, the Company received payment of the outstanding balance of the note, including accrued and unpaid interest. For all periods presented herein, the Company has reported the historical results of operations and cash flows of ICP as discontinued operations (see Note 19). Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50% of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolled equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income based on such fair value. If a subsidiary is consolidated upon a change in control, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20% and 50% of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings or losses from investments in 50% or less owned companies in the accompanying consolidated statements of income as equity in earnings (losses) of 50% or less owned companies, net of tax. The Company employs the cost method of accounting for investments in 50% or less owned companies it does not control or exercise significant influence. These investments in private companies are carried at cost and are adjusted only for capital distributions and other-than-temporary declines in fair value. Acquisition of Noncontrolling Interest. On August 2, 2019, the Company, through certain subsidiaries, became the sole owner of the SEA-Vista joint venture by acquiring the 49% interest (the “Remaining SEA-Vista Interest”) that had been owned by ACP III Tankers, LLC (the "Seller"), an affiliate of Avista Capital Partners. As consideration for the Remaining SEA-Vista Interest, SEACOR issued 1,500,000 shares of Common Stock to the Seller (the "Consideration Shares"), in a noncash transaction, and the Company paid $107.7 million in cash, inclusive of expenses related to the transaction (see Notes 12 and 13). Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include those related to allowance for doubtful accounts, useful lives of property and equipment, impairments, income tax provisions and certain accrued liabilities. Actual results could differ from those estimates and those differences may be material. Adoption of New Accounting Standards. On January 1, 2019, the Company adopted Financial Accounting Standards Board (“FASB”) Topic 842, Leases (“Topic 842”) using a modified prospective approach and implemented internal controls and systems to enable the preparation of financial information upon adoption. The Company elected the available practical expedients permitted under the guidance including the option to not separate lease and nonlease components in calculating the right-of-use assets and corresponding lease liabilities and to not apply the recognition requirements of Topic 842 to short-term leases (leases that have a duration of twelve months or less at lease inception). Generally, it was not possible for the Company to determine the interest rate implicit in each of its operating leases and therefore used its incremental borrowing rate in calculating operating lease right-of-use assets and lease liabilities. The Company assigned its leases to portfolios based on the remaining term at the time of adoption and applied a single rate to each portfolio of leases as the result was not materially different than using a specific discount rate for each individual lease. The Company included renewal options that were reasonably certain of being exercised in determining the lease term. Upon adoption, the Company recorded operating lease right-of-use assets and lease liabilities of $175.0 million for certain of its equipment, offices, real property and land leases (see Note 8). In addition, the Company recognized a cumulative-effect adjustment of $25.4 million, net of tax, to the opening balance of retained earnings primarily for previously deferred gains related to sale-leaseback transactions. On January 1, 2018, the Company adopted Financial Accounting Standard Board (“FASB”) Topic 606, Revenue from Contracts with Customers (“Topic 606”). As a consequence of adopting Topic 606, the Company now recognizes all of the operating revenues and expenses associated with the dry-cargo barge pools it manages along with additional operating expenses reflective of barge pool earnings attributable to third-party barge owners and not the Company in its capacity as manager. Under Topic 606, the Company determined it was a principal with respect to the third-party barge owners. Previously, the Company recognized operating revenues and expenses only for its proportionate share of the barge pools in which it participated, as it acted as an agent. All prior periods have been adjusted to reflect the retrospective adoption of Topic 606, which resulted in additional revenues and operating expenses of $73.0 million for the year ended December 31, 2017. The adoption of Topic 606 had no impact on previously reported balance sheets, operating income, net income or earnings (loss) per share. On January 1, 2018, the Company adopted ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory , which eliminates the deferral of the tax effects of intercompany asset sales other than inventory until the transferred assets are sold to a third party or recovered through use. As a result of the adoption of the standard, the deferred tax charges previously recognized from those sales resulted in a decrease in deferred tax assets and a cumulative adjustment to retained earnings of $2.5 million in the consolidated balance sheets and statements of changes in equity as of January 1, 2018. Revenue Recognition. The Company earns revenues from contracts with customers and from lease contracts. Revenue from Contracts with Customers. Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled to in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers control of the promised goods or services to its customers. Costs to obtain or fulfill a contract are expensed as incurred. Ocean Services' revenues from contracts with customers primarily arise from voyage charters, contracts of affreightment, tariff based port and infrastructure services, unit freight logistics services, and technical ship management agreements with vessel owners (see Note 18). Ocean Services transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Voyage charters are contracts to carry cargoes on a single voyage basis for a predetermined price, regardless of time to complete. Contracts of affreightment are contracts for cargoes that are committed on a multi-voyage basis for various periods of time, with minimum and maximum cargo tonnages specified over the period at a fixed or escalating rate per ton. Tariff based port and infrastructure services typically include operating harbor tugs alongside oceangoing vessels to escort them to their berth, assisting with the docking and undocking of these oceangoing vessels and escorting them back out to sea. They are contracted using prevailing port tariff terms on a per-use basis. In the unit freight logistics trade, transportation services typically include transporting shipping containers, rail cars, project cargoes, automobiles and U.S. military vehicles and are generally contracted on a per unit basis for the specified cargo and destination, typically in accordance with a publicly available tariff rate or based on a negotiated rate when moving larger volumes over an extended period. Managed services include technical ship and crew management agreements whereby Ocean Services provides technical ship and crew management services to third-party customers for a predetermined price over a specified period of time, typically a year or more. Inland Services' revenues from contracts with customers primarily arise from contracts of affreightment, terminal operations, fleeting operations and repair and maintenance services (see Note 18). Inland Services transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Contracts of affreightment are contracts whereby customers are charged an established rate per ton to transport cargo from point-to-point. Terminal operations includes tank farms and dry bulk and container handling facilities that are marketed under contractual rates and terms driven by throughput volume. Fleeting operations includes fleeting services whereby barges are held in fleeting areas for an agreed-upon day rate and shifting services whereby harbor boats are used to pick up and drop off barges to assist in assembling tows and to move barges to and from the dock for loading and unloading at predetermined per-shift fees. Other operations primarily include a machine shop specializing in towboat and barge cleaning, repair and maintenance services that are charged on an hourly or a fixed fee basis depending on the scope and nature of the work. Witt O’Brien’s revenues from contracts with customers primarily arise from time and material and retainer contracts (see Note 18). Witt O’Brien’s transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Time and material contracts primarily relate to emergency response, debris management or consulting services that Witt O’Brien’s performs for a predetermined fee. Retainer contracts, which are nearly all with vessel services operators and oil companies, are contracted based on agreed-upon rates. The Company’s Other business segment includes Cleancor, which primarily earns revenues from the sale of liquefied natural gas (see Note 18). Under these arrangements, control of the goods are transferred to the customer and performance obligations are satisfied at a point in time, and therefore revenue is recognized upon delivery while any related costs are expensed as incurred. Contract liabilities from contracts with customers arise when the Company has received consideration prior to performance and are included in other current liabilities in the accompanying consolidated balance sheets. The Company’s contract liability activity for the years ended December 31, were as follows (in thousands): 2019 2018 Balance at beginning of period $ 968 $ 983 Previously deferred revenues recognized upon completion of performance obligations during the period (968) (983) Net contract liabilities arising during the period 794 968 Balance at end of period $ 794 $ 968 Lease Revenues. The Company’s lease revenues are primarily from time charters, bareboat charters and non-vessel rental agreements that are recognized ratably over the lease term as services are provided, typically on a per day basis. Under a time charter, the Company provides a vessel to a customer for a set term and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer for a set term and the customer assumes responsibility for all operating expenses and risks of operation. Under a non-vessel rental agreement, the Company provides non-vessel property or equipment to a customer for a set term and the customer assumes responsibility for all operating expenses and risks of operation. Cash Equivalents. The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash equivalents consist of U.S. treasury securities, money market instruments, time deposits and overnight investments. Restricted Cash and Restricted Cash Equivalents. Restricted cash and restricted cash equivalents primarily relates to cash collateral for letters of credit and banking facility requirements. Marketable Securities. Marketable equity securities and debt securities with readily determinable fair values are reported in the accompanying consolidated balance sheets as marketable securities. These investments are stated at fair value, as determined by their observable market prices, with both realized and unrealized gains and losses reported in the accompanying consolidated statements of income as marketable security gains (losses), net. Short sales of marketable securities are stated at fair value in the accompanying consolidated balance sheets with both realized and unrealized gains and losses reported in the accompanying consolidated statements of income as marketable security gains (losses), net. Long and short marketable security positions are primarily in energy, marine, transportation and other related businesses. Marketable securities are classified as trading securities for financial reporting purposes with gains and losses reported as operating activities in the accompanying consolidated statements of cash flows. Trade Receivables. Customers of Ocean Services are primarily multinational oil companies, refining companies, oil trading companies, major gasoline retailers, large industrial consumers of crude, petroleum and chemicals, trading houses, pools, major automobile manufacturers and shippers, the U.S. government and regional power utilities. Customers of Inland Services are primarily major agricultural companies, fertilizer companies, trading companies and industrial companies. Customers of Witt O’Brien’s are primarily governments, energy companies, ship managers and owners, healthcare providers, universities and school systems. Customers of the Company’s other business activities primarily include agricultural and feed companies, asphalt producers and municipalities and government agencies. All customers are granted credit on a short-term basis and related credit risks are considered minimal. The Company routinely reviews its trade receivables and makes provisions for probable doubtful accounts; however, those provisions are estimates and actual results could differ from those estimates and those differences may be material. Trade receivables are deemed uncollectible and removed from accounts receivable and the allowance for doubtful accounts when collection efforts have been exhausted. Other Receivables. Other receivables primarily consists of income tax and insurance claim receivables. Other receivables also includes amounts due from certain of the Company’s 50% or less owned companies for working capital in excess of working capital advances, which are typically settled monthly in arrears. Derivative Instruments. The Company accounts for derivatives through the use of a fair value concept whereby all of the Company’s derivative positions are stated at fair value in the accompanying consolidated balance sheets. Realized and unrealized gains and losses on derivatives not designated as hedges are reported in the accompanying consolidated statements of income as derivative gains. Realized and unrealized gains and losses on derivatives designated as fair value hedges are recognized as corresponding increases or decreases in the fair value of the underlying hedged item to the extent they are effective, with any ineffective portion reported in the accompanying consolidated statements of income as derivative gains. Realized and unrealized gains and losses on derivatives designated as cash flow hedges are reported as a component of other comprehensive income (loss) in the accompanying consolidated statements of comprehensive income to the extent they are effective and reclassified into earnings on the same line item associated with the hedged transaction and in the same period the hedged transaction affects earnings. Any ineffective portions of cash flow hedges are reported in the accompanying consolidated statements of income as derivative gains. Realized and unrealized gains and losses on derivatives designated as cash flow hedges that are entered into by the Company’s 50% or less owned companies are also reported as a component of the Company’s other comprehensive income (loss) in proportion to the Company’s ownership percentage, with reclassifications and ineffective portions being included in equity in earnings (losses) of 50% or less owned companies, net of tax, in the accompanying consolidated statements of income. Concentrations of Credit Risk. The Company is exposed to concentrations of credit risk associated with its cash, cash equivalents, restricted cash and restricted cash equivalents, construction reserve funds and derivative instruments. The Company minimizes its credit risk relating to these positions by monitoring the financial condition of the financial institutions and counterparties involved and by primarily conducting business with large, well-established financial institutions and diversifying its counterparties. The Company does not currently anticipate nonperformance of its significant counterparties. The Company is also exposed to concentrations of credit risk relating to its receivables due from customers in the industries described above. The Company does not generally require collateral or other security to support its outstanding receivables. The Company minimizes its credit risk relating to receivables by performing ongoing credit evaluations and, to date, credit losses have not been material. Inventories. Inventories are stated at the lower of cost (using the first-in, first-out method) or market. Inventories consist primarily of fuel and fuel oil consumed by the Company’s vessels in its Ocean Services and Inland Services business segments. The Company records write-downs, as needed, to adjust the carrying amount of inventories to the lower of cost or market. During the years ended December 31, 2019, 2018 and 2017, the Company had no market write-downs of inventory. Property and Equipment. Equipment, stated at cost, is depreciated using the straight line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is typically based upon a newly built asset being placed into service and represents the point at which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older assets that have already exceeded their useful life as set forth in the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date. As of December 31, 2019, the estimated useful life (in years) of each of the Company’s major classes of new equipment was as follows: Petroleum and chemical carriers - U.S.-flag 25 Bulk carriers - U.S.-flag 25 Harbor and offshore tugs 25 Ocean liquid tank barges 25 Short-sea container/RORO (1) vessels 20 Inland river dry-cargo and specialty barges 20 Inland river liquid tank barges 25 Inland river towboats and harbor boats 25 Terminal and fleeting facilities 20 ______________________ (1) Roll On/Roll Off. The Company’s major classes of property and equipment as of December 31, were as follows (in thousands): Historical Cost (1) Accumulated Net Book 2019 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 649,795 $ (267,894) $ 381,901 Harbor and offshore tugs - U.S.-flag 133,419 (47,637) 85,782 Harbor tugs - Foreign-flag 45,379 (16,067) 29,312 Ocean liquid tank barges - U.S.-flag 39,238 (16,171) 23,067 Short-sea container/RORO - Foreign-flag 27,073 (11,990) 15,083 Bulk carriers - U.S.-flag 13,000 (9,800) 3,200 Other (2) 21,516 (10,994) 10,522 Construction in Progress 2,847 — 2,847 932,267 (380,553) 551,714 Inland Services: Dry-cargo barges 225,278 (118,615) 106,663 Specialty barges 3,828 (2,344) 1,484 Liquid tank barges 19,784 (3,684) 16,100 Towboats 62,207 (4,981) 57,226 Harbor boats 19,296 (9,324) 9,972 Terminal and fleeting facilities 103,455 (65,960) 37,495 Other (2) 27,536 (11,388) 16,148 Construction in Progress 7,736 — 7,736 469,120 (216,296) 252,824 Witt O’Brien’s: Other (2) 1,134 (993) 141 Other: Other (3) 8,897 (2,450) 6,447 Corporate and Eliminations: Other (2) 30,964 (23,732) 7,232 $ 1,442,382 $ (624,024) $ 818,358 ______________________ (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value. (2) Includes land and buildings, leasehold improvements, fixed-wing aircraft, vehicles and other property and equipment. (3) Includes LNG Equipment and other property and equipment. Historical Cost (1) Accumulated Net Book 2018 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 649,795 $ (241,604) $ 408,191 Harbor and offshore tugs - U.S.-flag 132,697 (41,764) 90,933 Harbor tugs - Foreign-flag 45,379 (13,822) 31,557 Ocean liquid tank barges - U.S.-flag 39,238 (14,649) 24,589 Short-sea container/RORO - Foreign-flag 29,846 (10,644) 19,202 Bulk carriers - U.S.-flag 13,000 (9,800) 3,200 Other (2) 20,073 (9,716) 10,357 Construction in Progress 202 — 202 930,230 (341,999) 588,231 Inland Services: Dry-cargo barges 222,539 (106,157) 116,382 Specialty barges 3,828 (1,904) 1,924 Liquid tank barges 20,011 (3,054) 16,957 Towboats 43,998 (3,294) 40,704 Harbor boats 18,695 (8,047) 10,648 Terminal and fleeting facilities 99,696 (62,274) 37,422 Other (2) 22,213 (10,364) 11,849 Construction in Progress 7,868 — 7,868 438,848 (195,094) 243,754 Witt O’Brien’s: Other (2) 1,227 (1,031) 196 Other: Other (3) 6,892 (490) 6,402 Corporate and Eliminations: Other (2) 30,132 (22,205) 7,927 $ 1,407,329 $ (560,819) $ 846,510 ______________________ (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value. (2) Includes land and buildings, leasehold improvements, fixed-wing aircraft, vehicles and other property and equipment. (3) Includes LNG Equipment and other property and equipment. During the years ended December 31, 2019, 2018 and 2017, depreciation expense totaled $65.0 million, $69.9 million and $72.1 million, respectively. Equipment maintenance and repair costs and the costs of routine overhauls, dry-dockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized. Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. During the years ended December 31, 2019, 2018 and 2017, capitalized interest totaled $0.1 million, $0.2 million and $2.7 million, respectively. As of December 31, 2019, the Company’s construction in progress totaling $12.5 million primarily consisted of the construction of harbor tugs, inland river towboats and other Inland Services equipment, and is included in historical cost in the accompanying consolidated balance sheets. Intangible Assets. The Company’s intangible assets primarily arose from business acquisitions (see Note 2) and consist of trademarks and tradenames, customer relationships and acquired contractual rights. These intangible assets are amortized over their estimated useful lives generally ranging from one The Company’s intangible assets by type were as follows (in thousands): Trademark/ Customer Acquired Total Gross Carrying Value Year Ended December 31, 2017 $ 3,324 $ 15,365 $ 18,358 $ 37,047 Acquired intangible assets — 1,120 — 1,120 Fully amortized intangible assets — (1,120) — (1,120) Year Ended December 31, 2018 3,324 15,365 18,358 37,047 Acquired intangible assets — — — — Year Ended December 31, 2019 $ 3,324 $ 15,365 $ 18,358 $ 37,047 Accumulated Amortization Year Ended December 31, 2017 $ (1,980) $ (5,146) $ (1,815) $ (8,941) Amortization expense (33

Business Acquisitions

Business Acquisitions	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Acquisitions	2. BUSINESS ACQUISITIONS Cleancor . On June 1, 2018, the Company acquired a controlling interest in Cleancor, a full service solution provider that delivers clean fuel to end users displacing legacy petroleum-based fuels, through the acquisition of its partners’ 50% equity interest for $3.2 million in cash. In addition, immediately prior to consolidation, the Company contributed as capital $1.9 million of notes receivable due from Cleancor. The Company performed a fair value analysis and the purchase price was allocated to the acquired assets and liabilities based on their fair value resulting in no goodwill being recorded. SCA. On March 1, 2018, the Company acquired Strategic Crisis Advisors LLC (“SCA”) for $1.5 million to be paid in two installments. The purchase price includes $0.9 million in contingent consideration that is dependent upon SCA meeting predetermined revenue targets for the twelve months following the acquisition date. The Company performed a fair value analysis and the purchase price was allocated to the acquired assets and liabilities based on their fair value resulting in no goodwill being recorded. ISH. On July 3, 2017, International Shipholding Corporation (“ISH”) emerged from bankruptcy pursuant to its chapter 11 plan of reorganization (the “Plan”) confirmed by the U.S. Bankruptcy Court for the Southern District of New York (the “ISH Acquisition”). Pursuant to the Plan, SEACOR Ocean Transport Inc., a wholly-owned subsidiary of SEACOR, acquired all of the equity of the reorganized ISH. Under the terms of the Plan, the Company paid consideration consisting of $10.5 million in cash, converted $18.1 million of debtor-in-possession financing into equity and assumed $28.7 million of debt primarily from a new credit facility that was secured by the assets and equity of ISH and was non-recourse to SEACOR and its subsidiaries other than ISH (see Note 7). ISH was renamed Waterman Logistics, Inc. in 2019 ("Waterman"). Waterman, through its subsidiaries, operates a diversified fleet of U.S. and foreign-flag vessels including four leased-in PCTCs and two owned U.S.-flag bulk carriers that provide worldwide and domestic maritime transportation services to commercial and governmental customers. In addition, Waterman has investments in two 50% or less owned companies that operate two foreign-flag rail ferries and a railcar repair and maintenance facility. The Company performed a fair value analysis and the purchase price was allocated to the acquired assets and liabilities based on their fair value resulting in no goodwill being recorded. Purchase Price Allocation. The allocation of the purchase price for the Company’s acquisitions for the years ended December 31, was as follows (in thousands): 2018 2017 Restricted cash and restricted cash equivalents $ — $ 13 Trade and other receivables 1,264 15,823 Other current assets 170 2,054 Investments, at Equity, and Advances to 50% or Less Owned Companies (5,123) 10,000 Property and Equipment 4,382 15,190 Intangible Assets 1,120 10,957 Other Assets (1) 7 (17,863) Accounts payable and other accrued liabilities (2) (1,609) — Other current liabilities (439) (17,214) Long-Term Debt — (28,725) Deferred Income Taxes — 3,939 Other Liabilities — (42) Noncontrolling interests in subsidiaries (82) — Purchase price (3) $ (310) $ (5,868) ______________________ (1) Net of debtor-in-possession financing converted into equity of $18.1 million, in 2017. (2) Includes $1.5 million of consideration to be paid in two installments. (3) Purchase price is net of cash acquired totaling $3.6 million and $16.4 million in 2018 and 2017, respectively.

Equipment Acquisitions And Disp

Equipment Acquisitions And Dispositions	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Equipment Acquisitions And Dispositions	3. EQUIPMENT ACQUISITIONS AND DISPOSITIONS Equipment Additions. The Company’s capital expenditures were $37.8 million, $50.3 million and $114.6 million during the years ended December 31, 2019, 2018, and 2017, respectively. Major owned equipment placed in service for the years ended December 31, were as follows: 2019 2018 2017 (1) Petroleum and chemical carriers - U.S.-flag — — 3 Harbor tugs - U.S.-flag 1 5 1 Harbor tugs - Foreign-flag — — 2 Short-sea container/RORO - Foreign-flag — 2 — Inland river liquid tank barges — — 2 Inland river towboats 2 — 3 ______________________ (1) Excludes two U.S.-flag bulk carriers acquired in the ISH acquisition (see Note 2). Equipment Dispositions. During the year ended December 31, 2019, the Company sold property and equipment for net proceeds of $2.5 million and gains of $0.5 million. In addition, the Company recognized previously deferred gains of $2.4 million. During the year ended December 31, 2018, the Company sold property and equipment for net proceeds of $16.1 million and gains of $6.6 million. In addition, the Company recognized previously deferred gains of $13.0 million. During the year ended December 31, 2017, the Company sold property and equipment for net proceeds of $164.8 million and gains of $23.3 million, of which $10.0 million were recognized currently and $13.3 million were deferred (see Note 1). Equipment dispositions included the sale-leaseback of one U.S.-flag petroleum and chemical carrier for $134.9 million, with leaseback terms of 104 months and 50 dry-cargo barges for $12.5 million with leaseback terms of 84 months. Gains of $13.3 million related to the sale-leasebacks were deferred and were being amortized over the respective minimum lease periods until January 1, 2019, when the Company adopted Topic 842 (see Note 1). In addition, the Company recognized previously deferred gains of $2.3 million. The Company also recognized a loss of $0.3 million related to the total loss of one inland river specialty barge. Major equipment dispositions for the years ended December 31, were as follows: 2019 2018 2017 Petroleum and chemical carriers - U.S.-flag — 1 1 Harbor tugs - U.S.-flag — 1 — Short-sea container/RORO - Foreign-flag 1 — — Inland river dry-cargo barges — 32 50 Inland river specialty barges — 2 2 Inland river towboats — — 2

Investments, At Equity, And Adv

Investments, At Equity, And Advances To 50% Or Less Owned Companies	12 Months Ended
	Dec. 31, 2019
Equity Method Investment, Summarized Financial Information [Abstract]
Investments, At Equity, And Advances To 50% Or Less Owned Companies	4. INVESTMENTS, AT EQUITY, AND ADVANCES TO 50% OR LESS OWNED COMPANIES Investments, at equity, and advances to 50% or less owned companies as of December 31, were as follows (in thousands): Ownership 2019 2018 Ocean Services: Trailer Bridge (1) 55.3% $ 56,770 $ 56,364 RF Vessel Holdings 50.0% 15,878 10,826 Golfo de Mexico 50.0% 3,485 5,272 KSM 50.0% 1,916 1,478 78,049 73,940 Inland Services: SCFCo 50.0% 33,705 37,219 Bunge-SCF Grain 50.0% 15,112 14,738 SCF Bunge Marine (1) 62.5% 3,990 3,144 Other 50.0% 2,285 2,796 55,092 57,897 Witt O’Brien’s: O’Brien’s do Brazil 50.0% 1,274 472 Other: VA&E 23.8% 10,448 13,073 Avion 39.1% 10,706 10,290 Other 40.0% – 47.5% 1,539 1,214 22,693 24,577 $ 157,108 $ 156,886 ______________________ (1) The Company’s ownership percentage represents its economic interest in the 50% or less owned company. Combined Condensed Financial Information. Summarized financial information for the Company’s investments, at equity, excluding SCFCo and Trailer Bridge, as of and for the years ended December 31, was as follows (in thousands): 2019 2018 Current assets $ 228,420 $ 184,704 Noncurrent assets 101,292 77,929 Current liabilities 160,688 113,784 Noncurrent liabilities 58,413 46,503 2019 2018 2017 Operating Revenues $ 1,015,627 $ 786,717 $ 1,068,190 Costs and Expenses: Operating and administrative 1,005,757 771,324 1,035,952 Depreciation 4,968 7,216 11,810 1,010,725 778,540 1,047,762 Gains on Asset Dispositions and Impairments, Net — 38 16,115 Operating Income $ 4,902 $ 8,215 $ 36,543 Net Income $ 2,922 $ 3,967 $ 23,383 As of December 31, 2019 and 2018, cumulative undistributed net losses of 50% or less owned companies accounted for by the equity method and included in the Company’s consolidated retained earnings were $69.8 million and $65.0 million, respectively. Trailer Bridge. Trailer Bridge, Inc. (“Trailer Bridge”), an operator of U.S.-flag RORO and deck barges, provides marine transportation services between Jacksonville, Florida, San Juan, Puerto Rico and Puerto Plata, Dominican Republic. The Company provided secured financing to Trailer Bridge and during the year ended December 31, 2017, the Company provided advances of $2.0 million and received repayments of $6.0 million on the secured financing. As of December 31, 2017, there was no outstanding balance on the secured financing. During the years ended December 31, 2019, 2018 and 2017, the Company earned revenues of $4.0 million, $3.5 million and $3.1 million, respectively, from the time charter of one U.S.-flag offshore tug to Trailer Bridge. RF Vessel Holdings. On July 3, 2017, as part of the ISH Acquisition (see Note 2), the Company acquired a 100% interest in Rail Ferry Vessel Holdings LLC (“RF Vessel Holdings”), which owns two foreign-flag rail ferries. On September 1, 2017, the Company sold a 50% interest in RF Vessel Holdings to G&W Agave Holdings (MI) Inc. for $1.9 million and retained a 50% ownership interest in the newly-formed joint venture. During the years ended December 31, 2019 and 2018, the Company and its partner each contributed capital of $4.7 million and $9.1 million, respectively, to RF Vessel Holdings primarily related to the construction of two new foreign-flag rail ferries with scheduled deliveries during 2021. Golfo de Mexico. On July 3, 2017, as part of the ISH Acquisition (see Note 2), the Company acquired a 100% interest in Golfo de Mexico Rail Ferry Holdings LLC (“Golfo de Mexico”), which operates the two foreign-flag rail ferries owned by RF Vessel Holdings. On September 1, 2017, the Company sold a 50% interest in Golfo de Mexico to G&W Agave Holdings (MI) Inc. for $3.1 million and retained a 50% ownership interest in the newly-formed joint venture. During the years ended December 31, 2019 and 2018, the Company and its partner each contributed capital of $0.5 million and $4.6 million, respectively, to Golfo de Mexico. During the year ended December 31, 2017, the Company received dividends of $0.3 million from Golfo de Mexico. The Company provides Golfo de Mexico with technical, commercial, administrative and construction management services, and during the years ended December 31, 2019, 2018 and 2017, the Company received $1.8 million, $1.1 million and $0.3 million, respectively, for these services. KSM. On April 1, 2017, the Company and Kotug Caribbean Holdings LLC formed Kotug Seabulk Maritime LLC (“KSM”). KSM operates four foreign-flag harbor tugs, two foreign-flag specialty vessels and one foreign-flag ocean liquid tank barge in Freeport, Grand Bahama, supporting terminal operations. During the years ended December 31, 2018 and 2017, the Company and its partner each contributed capital of $1.0 million and $0.3 million, respectively, to KSM. The Company provides KSM with technical, commercial and administrative management services and during the years ended December 31, 2019, 2018 and 2017, received $0.4 million, $0.4 million and $0.3 million, respectively, for these services. During the years ended December 31, 2019, 2018 and 2017, the Company earned revenues of $1.4 million, $1.3 million and $1.1 million, respectively, from the bareboat charter of two foreign-flag harbor tugs to KSM. SeaJon. SeaJon LLC (“SeaJon”) owned an articulated tug-barge operating in the Great Lakes trade that was sold to a third party in June 2017 and, as of December 31, 2017, SeaJon had been liquidated. During the year ended December 31, 2017, the Company received capital distributions of $3.5 million and dividends of $12.5 million from SeaJon. SCFCo. SCFCo Holdings LLC (“SCFCo”) was established to operate inland river dry-cargo barges and inland river towboats on the Parana-Paraguay Waterway and a terminal facility at Port Ibicuy, Argentina. During the year ended December 31, 2017, the Company contributed capital of $0.4 million to SCFCo. During the year ended December 31, 2017, the Company provided working capital advances and loans of $2.5 million to SCFCo and received repayments on working capital advances and loans of $1.7 million from SCFCo. During the year ended December 31, 2018, the Company received repayments on working capital advances and loans of $2.6 million from SCFCo. As of December 31, 2019, $34.3 million of working capital advances and loans remained outstanding. The Company also provides SCFCo with certain information technology services and received $0.1 million, $0.1 million and $0.1 million, respectively, for these services during the years ended December 31, 2019, 2018 and 2017. As of December 31, 2019, the Company’s carrying value of its investment in SCFCo was $20.2 million lower than its proportionate share of the underlying equity in SCFCo. Summarized financial information for SCFCo as of and for the years ended December 31, was as follows (in thousands): 2019 2018 Current assets $ 5,878 $ 8,322 Noncurrent assets 113,638 121,001 Current liabilities 11,077 12,958 Noncurrent liabilities 59,717 56,078 2019 2018 2017 Operating Revenues $ 45,049 $ 54,486 $ 44,177 Costs and Expenses: Operating and administrative 39,375 45,911 40,106 Depreciation 10,027 17,901 17,803 49,402 63,812 57,909 Operating Loss (4,353) (9,326) (13,732) Interest expense (6,971) (6,573) (6,120) Other expense, net (241) (2,229) (961) Net Loss $ (11,565) $ (18,128) $ (20,813) Bunge-SCF Grain. Bunge-SCF Grain LLC (“Bunge-SCF Grain”) operates terminal grain elevators in Illinois. The Company has provided Bunge-SCF Grain with working capital advances. As of December 31, 2019, the total outstanding balance of working capital advances was $7.0 million. Bunge-SCF Grain also operates and manages the Company’s grain storage and handling facility in McLeansboro, Illinois. During the years ended December 31, 2019, 2018 and 2017, the Company earned revenues of $0.7 million, $0.9 million and $1.1 million, respectively, from the lease of this terminal facility to Bunge-SCF Grain. Certain dry-cargo barge pools managed by the Company provide freight transportation to Bunge-SCF Grain and those pools received $24.9 million, $10.7 million and $7.2 million for these services during the years ended December 31, 2019, 2018 and 2017, respectively. SCF Bunge Marine. SCF Bunge Marine LLC (“SCF Bunge Marine”) provides towing services on the U.S. Inland Waterways, primarily the Mississippi River, Illinois River, Tennessee River and Ohio River. The Company time charters eight inland river towboats to SCF Bunge Marine, of which four are bareboat chartered-in by the Company from a third-party leasing entity. The Company and its partner are required to fund SCF Bunge Marine, if necessary, to support the payment of its time charter obligations to the Company. During the years ended December 31, 2019, 2018 and 2017, the Company earned revenues of $6.8 million, $3.3 million, and $2.1 million, respectively, from the time charter of these inland river towboats to SCF Bunge Marine. During the years ended December 31, 2019 and 2018, the Company contributed capital of $0.3 million and $0.5 million, respectively, to SCF Bunge Marine. During the years ended December 31, 2018 and 2017, the Company received dividends of $4.6 million and $0.1 million, respectively, from SCF Bunge Marine. Certain dry-cargo barge pools managed by the Company obtain towing services from SCF Bunge Marine and those pools paid $53.3 million, $54.5 million and $41.4 million to SCF Bunge Marine for these services during the years ended December 31, 2019, 2018 and 2017, respectively. Other Inland Services. The Company’s other Inland Services 50% or less owned company operates a fabrication facility. During the year ended December 31, 2019, the Company and its partner each received a noncash dividend of one specialty barge valued at $0.6 million. O’Brien’s do Brazil. O’Brien’s do Brasil Consultoria em Emergencias e Meio Ambiente A/A (“O’Brien’s do Brazil”) is an emergency consulting organization providing preparedness, response and recovery services in Brazil. During the years ended December 31, 2019, 2018 and 2017, the Company received dividends of $0.1 million $0.2 million and $0.1 million, respectively from O’Brien’s do Brazil. Hawker Pacific. Hawker Pacific Airservices Limited (“Hawker Pacific”) is an aviation sales and support organization and a distributor of aviation components from leading manufacturers. On April 30, 2018, the Company sold its 34.2% interest in Hawker Pacific for $78.0 million in cash and recognized a gain of $53.9 million, which is included in other, net in the accompanying consolidated statements of income. During the years ended December 31, 2018 and 2017, the Company received management fees of $0.1 million and $0.3 million respectively, from Hawker Pacific. VA&E. VA&E Trading LLP (“VA&E”), was formed to focus on the global origination, trading and merchandising of sugar and other commodities, pairing producers and buyers and arranging for the transportation and logistics of the product. During the year ended December 31, 2019, the Company received capital distributions of $3.7 million from VA&E, which reduced the Company’s noncontrolling interest in VA&E to 23.8%. The Company provides VA&E an uncommitted credit facility of up to $3.5 million and a subordinated loan of $4.4 million. During the year ended December 31, 2017, the Company advanced $3.5 million on the uncommitted credit facility. During the year ended December 31, 2018, the Company received repayments of $5.4 million and advanced $5.4 million on the uncommitted credit facility. During the year ended December 31, 2019, the Company advanced $0.5 million to VA&E on the subordinated loan. As of December 31, 2019, outstanding advances to VA&E were $8.3 million, inclusive of accrued and unpaid interest. During the year ended December 31, 2018, the Company received dividends of $0.4 million from VA&E. Avion. Avion Pacific Limited (“Avion”) is a distributor of aircraft and aircraft related parts. During the year ended December 31, 2017, the Company made advances of $1.0 million and received repayments on advances of $4.0 million from Avion. As of December 31, 2019 and 2018, the Company had no outstanding advances to Avion. During the year ended December 31, 2018, the Company received dividends of $0.8 million from Avion. Other. The Company’s other 50% or less owned companies are primarily industrial aviation businesses in Asia. During the year ended December 31, 2018, the Company received repayments on working capital advances of $0.4 million and received capital distributions of $0.6 million from these 50% or less owned companies. During the year ended December 31, 2017, the Company received repayments on working capital advances of $0.4 million from these 50% or less owned companies. As of December 31, 2019, total advances outstanding to these 50% or less owned companies were $2.0 million.

Construction Reserve Funds

Construction Reserve Funds	12 Months Ended
	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Construction Reserve Funds	5. CONSTRUCTION RESERVE FUNDS The Company has established, pursuant to Section 511 of the Merchant Marine Act, 1936, as amended, construction reserve fund accounts subject to agreements with the Maritime Administration. In accordance with this statute, the Company is permitted to deposit proceeds from the sale of certain vessels into the construction reserve fund accounts and defer the taxable gains realized from the sale of those vessels. Qualified withdrawals from the construction reserve fund accounts are only permitted for the purpose of acquiring qualified U.S.-flag vessels as defined in the statute and approved by the Maritime Administration. To the extent that sales proceeds are reinvested in replacement vessels, the carryover depreciable tax basis of the vessels originally sold is attributed to the U.S.-flag vessels acquired using such qualified withdrawals. The construction reserve funds must be committed for expenditure within three years of the date of sale of the equipment, subject to two one-year extensions that can be granted at the discretion of the Maritime Administration, or be released for the Company’s general use as nonqualified withdrawals. For nonqualified withdrawals, the Company is obligated to pay taxes on the previously deferred gains at the prevailing statutory tax rate plus penalties and interest thereon for the period such taxes were deferred.

Notes Receivables From Third Pa

Notes Receivables From Third Parties	12 Months Ended
	Dec. 31, 2019
Notes, Loans and Financing Receivable, Net, Noncurrent [Abstract]
Notes Receivables From Third Parties	6. NOTES RECEIVABLE FROM THIRD PARTIES From time to time, the Company engages in lending activities involving various types of businesses or equipment. The Company recognizes interest income as payments are due, typically monthly, and expenses all costs associated with its lending activities as incurred. These notes receivable are typically collateralized by the underlying equity or equipment and require scheduled or periodic principal and interest payments. As of December 31, 2019 and 2018, the outstanding balance of notes receivable from third parties was $1.1 million and $2.2 million, respectively, and is included in other long-term assets in the accompanying consolidated balance sheets. During the years ended December 31, 2019, 2018 and 2017, the Company made advances on notes receivable from third parties of $1.0 million, $0.1 million and $10.1 million, respectively, and received repayments on notes receivable from third parties of $2.1 million, $0.6 million and $34.5 million, respectively.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2019
Long-term Debt, Unclassified [Abstract]
Long-Term Debt	7. LONG-TERM DEBT The Company’s borrowings as of December 31, were as follows (in thousands): 2019 2018 3.0% Convertible Senior Notes (1) $ 50,041 $ 107,284 2.5% Convertible Senior Notes 64,455 64,455 3.25% Convertible Senior Notes (2) 117,782 117,782 SEA-Vista 2015 Credit Facility (3) — 87,977 SEA-Vista 2019 Credit Facility (4) 100,000 — Other (5) 7,957 8,561 340,235 386,059 Portion due within one year, net of unamortized discount and issue costs (58,854) (8,497) Debt discount included in long-term debt (19,990) (28,334) Debt issuance costs included in long-term debt (5,779) (3,100) $ 255,612 $ 346,128 ______________________ (1) Excludes unamortized discount and unamortized issue costs of $1.6 million and $0.2 million, respectively, as of December 31, 2019 and $7.2 million and $0.7 million, respectively, as of December 31, 2018. (2) Excludes unamortized discount and unamortized issue costs of $18.4 million and $1.6 million, respectively, as of December 31, 2019 and $21.1 million and $1.9 million, respectively, as of December 31, 2018. (3) Excludes unamortized issue costs of $0.4 million as of December 31, 2018. (4) Excludes unamortized issue costs of $2.1 million as of December 31, 2019. (5) Excludes unamortized issue costs of $0.1 million and $0.1 million as of December 31, 2019 and December 31, 2018, respectively. The Company’s contractual long-term debt maturities for the years ended December 31, are as follows (in thousands): 2020 (1) $ 60,630 2021 10,499 2022 10,503 2023 10,368 2024 60,244 Years subsequent to 2024 187,991 $ 340,235 ______________________ (1) Includes the aggregate principal amount outstanding of the Company's 3.0% Convertible Senior Notes with a contractual maturity date of November 15, 2028 as the holders may require the Company to repurchase the notes on November 19, 2020. 3.0% Convertible Senior Notes. On November 13, 2013, SEACOR issued $230.0 million aggregate principal amount of its 3.0% Convertible Senior Notes due November 15, 2028 (the “3.0% Convertible Senior Notes”). Interest on the 3.0% Convertible Senior Notes is payable semi-annually on May 15 and November 15 of each year. Beginning November 15, 2020, contingent interest is payable during any subsequent semi-annual interest period if the average trading price of the 3.0% Convertible Senior Notes for a defined period is greater than or equal to $1,200 per bond ($1,000 face value). The amount of contingent interest payable for any such period will be equal to 0.45% per annum of such average trading price of the 3.0% Convertible Senior Notes. Prior to August 15, 2028, the 3.0% Convertible Senior Notes are convertible into shares of SEACOR common stock, par value $0.01 per share (“Common Stock”), at a conversion rate (“Conversion Rate”) of 12.5892 shares per bond ($1,000 face value) only if certain conditions are met, as more fully described in the indenture. After August 15, 2028, holders may elect to convert at any time. The Company has reserved the maximum number of shares of Common Stock needed upon conversion, or 629,976 shares as of December 31, 2019. Subsequent to November 19, 2018, the 3.0% Convertible Senior Notes may be redeemed at the Company's option, in whole or in part, at a price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of redemption. On November 19, 2020, November 20, 2023 or if the Company undergoes a fundamental change, as more fully described in the indenture, the holders of the 3.0% Convertible Senior Notes may require SEACOR to purchase for cash all or part of the notes at a price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of purchase. The Company accounts separately for the liability and equity components of the 3.0% Convertible Senior Notes and the associated underwriting fees in a manner that reflects the Company’s non-convertible borrowing rate. The resulting debt discount and offering costs associated with the liability component are amortized as additional non-cash interest expense over the seven On May 15, 2018, the Company exchanged $117.8 million aggregate principal amount of its outstanding 3.0% Convertible Senior Notes for a like principal amount of new 3.25% Convertible Senior Notes (see "—3.25% Convertible Senior Notes"). During the year ended December 31, 2018, the Company purchased $4.9 million in principal amount of its 3.0% Convertible Senior Notes for total consideration of $4.7 million. These transactions resulted in debt extinguishment losses of $5.4 million included in the accompanying consolidated statements of income. During the year ended December 31, 2019, the Company purchased $57.2 million in principal amount of its 3.0% Convertible Senior Notes for total consideration of $56.2 million resulting in losses on debt extinguishment of $2.1 million included in the accompanying consolidated statements of income. Subsequent to December 31, 2019, the Company purchased $2.2 million in principal amount of its 3.0% Convertible Senior Notes for total consideration of $2.2 million. 2.5% Convertible Senior Notes. On December 11, 2012, SEACOR issued $350.0 million aggregate principal amount of its 2.5% Convertible Senior Notes due December 15, 2027 (the “2.5% Convertible Senior Notes”). Interest on the 2.5% Convertible Senior Notes is payable semi-annually on June 15 and December 15 of each year. Beginning December 15, 2017, contingent interest is payable during any subsequent semi-annual interest period if the average trading price of the 2.5% Convertible Senior Notes for a defined period is greater than or equal to $1,200 per bond ($1,000 face value). The amount of contingent interest payable for any such period will be equal to 0.25% per annum of such average trading price of the 2.5% Convertible Senior Notes. Prior to September 15, 2027, the 2.5% Convertible Senior Notes are convertible into shares of Common Stock at a conversion rate of 19.0381 shares per bond ($1,000 face value) only if certain conditions are met, as more fully described in the indenture. After September 15, 2027, holders may elect to convert at any time. The Company has reserved the maximum number of shares of Common Stock needed upon conversion, or 1,227,101 shares as of December 31, 2019. On December 12, 2017, the Company entered into a supplemental indenture, which amended the indenture to provide holders with an additional put right for their Notes on May 31, 2018. In addition, the Company surrendered and waived its right to redeem the Notes until May 31, 2018. Subsequent to May 31, 2018, the 2.5% Convertible Senior Notes may be redeemed at the Company's option, in whole or in part, at a price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of redemption. On December 19, 2022, or if the Company undergoes a fundamental change, as more fully described in the indenture as amended by the first supplemental indenture dated as of December 12, 2017, the holders of the 2.5% Convertible Senior Notes may require SEACOR to purchase for cash all or part of the notes at a price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of purchase. The Company accounts separately for the liability and equity components of the 2.5% Convertible Senior Notes and the associated underwriting fees in a manner that reflects the Company’s non-convertible borrowing rate. The resulting debt discount and offering costs associated with the liability component was amortized as additional non-cash interest expense over the five During the year ended December 31, 2017, the Company purchased $61.7 million in principal amount of its 2.5% Convertible Senior Notes for total consideration of $61.9 million. Consideration of $60.5 million was allocated to the settlement of the long-term debt resulting in gains on debt extinguishment of $0.1 million included in the accompanying consolidated statements of income. Consideration of $1.4 million was allocated to the purchase of the conversion option embedded in the 2.5% Convertible Senior Notes as included in the accompanying consolidated statements of changes in equity. Pursuant to the put option set forth in the indenture and governing the 2.5% Convertible Senior Notes, the Company completed a tender offer for the 2.5% Convertible Senior Notes in which, on December 19, 2017, the Company purchased $31.0 million in principal amount of its 2.5% Convertible Senior Notes that were validly surrendered for purchase for total consideration of $31.0 million. 3.25% Convertible Senior Notes. On May 15, 2018, SEACOR issued $117.8 million aggregate principal amount of its 3.25% Convertible Senior Notes due May 15, 2030 (the “3.25% Convertible Senior Notes”). Interest on the 3.25% Convertible Senior Notes is payable semi-annually on May 15 and November 15 of each year. Beginning May 15, 2025, contingent interest is payable during any subsequent semi-annual interest period if the average trading price of the 3.25% Convertible Senior Notes for a defined period is greater than or equal to $1,200 per bond ($1,000 face value). The amount of contingent interest payable for any such period will be equal to 0.45% per annum of such average trading price of the 3.25% Convertible Senior Notes. Prior to February 15, 2030, the 3.25% Convertible Senior Notes are convertible into shares of Common Stock, at a Conversion Rate of 13.1920 shares per bond ($1,000 face value) only if certain conditions are met, as more fully described in the indenture. After February 15, 2030, holders may elect to convert at any time. The Company has reserved the maximum number of shares of Common Stock needed upon conversion, or 1,553,780 shares as of December 31, 2019. On or after May 15, 2022, the 3.25% Convertible Senior Notes may be redeemed at the Company's option, in whole or in part, at a price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of redemption. On May 15, 2025, or if the Company undergoes a fundamental change, as more fully described in the indenture, the holders of the 3.25% Convertible Senior Notes may require SEACOR to purchase for cash all or part of the notes at a price equal to 100% of the principal amount, plus accrued and unpaid interest to the date of purchase. The Company accounts separately for the liability and equity components of the 3.25% Convertible Senior Notes and the associated underwriting fees in a manner that reflects the Company’s non-convertible borrowing rate. Of the total issued amount of $117.8 million and offering costs of $2.5 million, the Company allocated $95.1 million and $2.0 million, respectively, to the liability component and $22.7 million and $0.5 million, respectively, to the equity component. The resulting debt discount and offering costs associated with the liability component are amortized as additional non-cash interest expense over the seven 7.375% Senior Notes. On September 24, 2009, SEACOR issued $250.0 million aggregate principal amount of its 7.375% Senior Notes due October 1, 2019 (the “7.375% Senior Notes”). The 7.375% Senior Notes were issued under a supplemental indenture dated as of September 24, 2009 (the “2009 Supplemental Indenture”) to the base indenture relating to SEACOR’s senior debt securities, dated as of January 10, 2001, between SEACOR and U.S. Bank National Association, as trustee. Interest on the 7.375% Senior Notes was payable semi-annually on April 1 and October 1 of each year. The 7.375% Senior Notes were redeemed at a price equal to the principal amount, plus accrued and unpaid interest to the date of redemption, plus a specified “make-whole” premium in October of 2018. During the year ended December 31, 2017, the Company purchased $7.6 million in principal amount of its 7.375% Senior Notes for $7.7 million resulting in losses on debt extinguishment of $0.2 million included in the accompanying consolidated statements of income. During the year ended December 31, 2018, and prior to their redemption, the Company purchased $5.7 million in principal amount of its 7.375% Senior Notes for $5.9 million. On October 31, 2018, the Company redeemed the remaining $147.4 million in principal amount of its 7.375% Senior Notes for $153.0 million including a make-whole premium of $5.6 million calculated in accordance with the terms of the indenture. These transactions resulted in losses on debt extinguishment of $6.1 million included in the accompanying consolidated statements of income. SEACOR Revolving Credit Facility. On March 19, 2019, the Company entered into a $125.0 million credit agreement with a syndicate of lenders (the “SEACOR Revolving Credit Facility”) that matures March 19, 2024 and is secured by a pledge over all of SEACOR’s assets and certain of its subsidiaries’ assets, subject to certain exceptions. The SEACOR Revolving Credit Facility permits the Company to borrow up to $125.0 million, from time to time as revolving loans, as such amounts may increase or decrease in accordance with the terms of the Credit Agreement. The loans will bear interest at either (i) a Base Rate plus a margin ranging from 0.75% to 2.00% depending on the Company’s maximum net funded debt ratio, as determined in accordance with the SEACOR Revolving Credit Facility, or (ii) interest periods of one, two, three or six months at an annual rate equal to London Interbank Offered Rate (“LIBOR”) for the corresponding deposits of U.S. dollars, plus a margin ranging from 1.75% to 3.00% based on the Company’s maximum net funded debt ratio, as determined in accordance with the SEACOR Revolving Credit Facility. A fee of 0.5% is payable on the unused commitment quarterly. The Company incurred $2.2 million of issuance costs related to the SEACOR Revolving Credit Facility. The SEACOR Revolving Credit Facility contains various financial and restrictive covenants including fixed charge coverage ratio, a net funded debt ratio, a collateral coverage ratio and restrictions limiting the Company’s ability to pay dividends or make certain investments, as well as other customary covenants, representations and warranties, and events of default as set forth in the agreement. During the year ended December 31, 2019, the Company drew $25.0 million and repaid $25.0 million under the SEACOR Revolving Credit Facility. As of December 31, 2019, the Company had $125.0 million of borrowing capacity. SEA-Vista 2015 Credit Facility. On April 15, 2015, SEA-Vista entered into a $300.0 million credit agreement with a syndicate of lenders that was scheduled to mature in 2020 (the “SEA-Vista 2015 Credit Facility”) and was secured by substantially all of SEA-Vista’s tangible and intangible assets, including its fleet of U.S.-flag petroleum and chemical carriers (See Note 1), with no recourse to SEACOR or its other subsidiaries. The SEA-Vista 2015 Credit Facility was comprised of three tranches: (i) a $100.0 million revolving credit facility (the “Revolving Loan”); (ii) an $80.0 million term loan (the “Term A-1 Loan”); and (iii) a $120.0 million delayed draw term loan (the “Term A-2 Loan”). The proceeds from the SEA-Vista 2015 Credit Facility were used to fund SEA-Vista’s working capital, general corporate purposes, capital commitments and the redemption of its Title XI Bonds. All three loans bore interest at a variable rate determined by reference to the London Interbank Offered Rate (“LIBOR”) plus a margin of between 2.00% and 2.75% as determined in accordance with the SEA-Vista 2015 Credit Facility or, at the election of SEA-Vista, a Base Rate plus a margin of between 1.25% and 1.75% as determined in accordance with the SEA-Vista 2015 Credit Facility. A quarterly fee was payable on the unused commitments of all three tranches. SEA-Vista incurred $3.1 million of issuance costs related to the SEA-Vista 2015 Credit Facility. During the year ended December 31, 2017, SEA-Vista drew $44.9 million and repaid $85.9 million on the Revolving Loan, $39.4 million on the Term A-1 Loan and $63.1 million on the Term A-2 Loan resulting in debt extinguishment losses of $0.7 million. During the year ended December 31, 2018, SEA-Vista repaid $39.0 million on the Revolving Loan, $3.3 million on the Term A-1 Loan and $5.5 million on the Term A-2 Loan. On December 20, 2019, SEA-Vista entered into an amended and restated $200.0 million credit agreement (see "—SEA-Vista 2019 Credit Facility"). Proceeds of $76.0 million from the SEA-Vista 2019 Credit Facility were used to repay the remaining balances on that date under the SEA-Vista 2015 Credit Facility, resulting in losses on debt extinguishment of $0.1 million included in the accompanying consolidated statements of income. During the year ended December 31, 2019, including the final repayment, SEA-Vista repaid $6.0 million on the Revolving Loan, $30.6 million on the Term A-1 Loan and $51.4 million on the Term A-2 Loan. SEA-Vista 2019 Credit Facility. On December 20, 2019, SEA-Vista entered into an amended and restated $200.0 million credit agreement with a syndicate of lenders (the “SEA-Vista 2019 Credit Facility”) and is secured by substantially all of SEA-Vista’s tangible and intangible assets, including its fleet of U.S.-flag petroleum and chemical carriers (See Note 1), with no recourse to SEACOR or its other subsidiaries. The agreement provides for a $100.0 million revolving credit facility (the "SEA-Vista Revolving Loan") and a $100.0 million term loan facility (the "Term Loan") both of which mature in December 2024. Each of the SEA-Vista Revolving Loan and the Term Loan has an accordion feature allowing for potential increases in principal amount. The SEA-Vista Revolving Loan allows for borrowings and reborrowings from time to time until maturity. The Term Loan is a single draw facility that was drawn in full on December 20, 2019. The proceeds of the Term Loan were used to repay $76.0 million outstanding under the SEA-Vista 2015 Credit Facility (see "—SEA-Vista 2015 Credit Facility") and $24.0 million was used by SEA-Vista for working capital needs and general corporate purposes. As of December 31, 2019, SEA-Vista had $100.0 million of borrowing capacity under the SEA-Vista 2019 Credit Facility. Both the SEA-Vista Revolving Loan and the Term Loan bear interest at a variable rate determined by reference to the London Interbank Offered Rate (“LIBOR”) plus a margin of between 2.00% and 2.75% or, at the election of SEA-Vista, a Base Rate plus a margin of between 1.00% and 1.75% each as determined in accordance with the SEA-Vista 2019 Credit Facility. A fee of 0.5% is payable on the unused SEA-Vista Revolving Loan commitment. SEA-Vista incurred $2.1 million of issuance costs related to the SEA-Vista 2019 Credit Facility. The principal of the Term Loan is repayable in quarterly installments of 2.50%, with the remaining principal balance, interest and all other amounts outstanding for all loans, including the SEA-Vista Revolving Loan, due and payable on the Maturity Date, December 20, 2024. In addition, SEA-Vista has the right to make optional prepayments on each of the loans without penalty in minimum amounts of $1.0 million. The SEA-Vista Credit Facility contains various financial maintenance and restrictive covenants including: funded debt to adjusted EBITDA; adjusted EBITDA to interest expense plus amortization; and aggregate collateral vessel value to the sum of funded debt and unused and unexpired commitments. ISH Credit Facility. On July 3, 2017, ISH emerged from bankruptcy pursuant to the Plan (see Note 2). In conjunction with the emergence under the Plan, ISH assumed debt of $25.0 million under a credit facility with a maturity date of July 2020. The facility consisted of two tranches: (i) a $5.0 million revolving credit facility (the “ISH Revolving Loan”) and (ii) a $20.0 million term loan (the “ISH Term Loan”) (collectively the “ISH Credit Facility”). ISH incurred $0.1 million of issuance costs in connection with the ISH Credit Facility. The proceeds from this facility were used for general working capital purposes and payments to ISH’s creditors in accordance with the Plan. Interest on both loans were based on a variable rate of either LIBOR multiplied by the Statutory Reserve Rate or Prime Rate plus an applicable margin, as defined in the ISH Credit Facility. A quarterly fee of 0.5% was payable on the unused commitment of the ISH Revolving Loan. Beginning September 30, 2017, ISH was required to make quarterly prepayments on the ISH Term Loan of $0.7 million. Commencing with the calendar year ending December 31, 2018, ISH was required to make annual prepayments on the ISH Term Loan in an amount equal to 50% of excess cash flow as defined in the credit agreement. The ISH Credit Facility contained various financial and restrictive covenants applicable to ISH and its subsidiaries including indebtedness to EBITDA and adjusted EBITDA to interest expense maintenance, as defined in the ISH Credit Facility. The ISH Credit Facility was non-recourse to SEACOR and its subsidiaries other than ISH. The ISH Credit Facility was secured by substantially all of ISH’s assets, including its fleet of U.S.-flag bulk carriers (See Notes 1 and 2). During the year ended December 31, 2017, ISH repaid $7.8 million on the ISH Term Loan and $5.0 million on the ISH Revolving Loan. During the year ended December 31, 2018, ISH repaid the outstanding balance of $12.2 million on the ISH Term Loan and terminated the credit facility resulting in debt extinguishment losses of $0.1 million included in the accompanying consolidated statements of income. Other. During 2017, the Company acquired $3.9 million of other debt related to the ISH acquisition (see Note 2). This debt bore interest at 7.0% and was collateralized by certain acquired assets. As of December 31, 2018, this debt was fully repaid. In addition, the Company has various other obligations including equipment and facility mortgages. As of December 31, 2019, these obligations have maturities ranging from 2020 through 2026, have interest rates ranging from 3.4% to 6.0% and require periodic payments of interest and principal. During the years ended December 31, 2019, 2018 and 2017, repayments on other debt was $0.6 million, $2.1 million (including the repayment and termination of the debt related to the ISH acquisition) and $3.0 million, respectively. Letters of Credit. As of December 31, 2019, the Company had outstanding letters of credit totaling $1.2 million with various expiration dates through 2027. Guarantees. The Company has guaranteed the payments of amounts owned under certain sale-leaseback transactions, equipment financing and multi-employer pension obligations on behalf of SEACOR Marine. As of December 31, 2019, these guarantees on behalf of SEACOR Marine totaled $22.9 million and the amount declines as payments are made on the outstanding obligations through 2023. The Company earns a fee from SEACOR Marine of 0.5% per annum on these guarantees. For the years ended December 31, 2019, 2018, and 2017 the Company earned $0.2 million, $0.3 million and $0.6 million, respectively, in guarantee fees from SEACOR Marine. Repurchase Authority. SEACOR’s Board of Directors previously approved a securities repurchase plan that authorizes the Company to acquire SEACOR Common Stock, par value $0.01 per share ("Common stock") 3.0% Convertible Senior Notes, 2.5% Convertible Senior Notes and 3.25% Convertible Senior Notes (collectively the “Securities”), through open market purchases, privately negotiated transactions or otherwise, depending on market conditions. On June 5, 2019, SEACOR's Board of Directors increased the Company's repurchase authority for the Securities to $150.0 million. As of December 31, 2019, SEACOR had remaining authorization for Securities repurchases of $129.9 million.

Operating Leases (Notes)

Operating Leases (Notes)	12 Months Ended
	Dec. 31, 2019
Operating Leases [Abstract]
Operating Leases	8. OPERATING LEASES Lessee. As of December 31, 2019, the Company leased in two U.S.-flag petroleum and chemical carriers, four U.S.-flag harbor tugs, four U.S.-flag PCTCs, 50 inland river dry-cargo barges, four inland river towboats, six inland river harbor boats and certain facilities and other equipment. The leases generally contain purchase and renewal options or rights of first refusal with respect to the sale or lease of the equipment. As of December 31, 2019, the lease terms of the U.S.-flag petroleum and chemical carriers, which are subject to subleases, have remaining durations of 33 and 80 months. The lease terms of the other vessels, facilities and equipment range in duration from 4 to 195 months. For operating leases as of December 31, 2019, the future minimum payments in the years ended December 31, were as follows (in thousands): 2020 $ 41,914 2021 37,711 2022 27,460 2023 15,531 2024 13,603 Years subsequent to 2024 27,066 163,285 Interest component (18,979) 144,306 Current portion of long-term operating lease liabilities (36,011) Long-term operating lease liabilities $ 108,295 The components of lease expense for the year ended December 31, were as follows (in thousands): 2019 Operating lease expense $ 42,863 Short-term lease expense (lease duration of twelve months or less at lease commencement) 22,992 Sublease income (33,428) $ 32,427 Other information related to operating leases for the year ended December 31, was as follows (in thousands except weighted average data): 2019 Operating cash outflows from operating leases $ 43,096 Right-of-use assets obtained in exchange for operating lease liabilities $ 179,944 Weighted average remaining lease term, in years 5.2 Weighted average discount rate 4.9 % Lessor. As of December 31, 2019, arrangements in which the Company acted as a lessor with remaining terms in excess of one year included the bareboat charter of four U.S.-flag petroleum and chemical carriers, five U.S.-flag ocean liquid tank barges and six foreign-flag harbor tugs, the time charter of four U.S.-flag petroleum and chemical carriers, four U.S.-flag PCTCs, eight inland river towboats and one U.S.-flag offshore tug, and other non-vessel rental arrangements of certain property and equipment. Future minimum lease revenues from these arrangements for the years ended December 31, were as follows (in thousands): Total Minimum Lease Revenues Leased-in Obligations (1) Net Minimum Lease Income 2020 $ 160,324 $ (31,572) $ 128,752 2021 114,395 (29,683) 84,712 2022 55,990 (22,942) 33,048 2023 34,701 (11,315) 23,386 2024 27,205 (11,346) 15,859 Years subsequent to 2024 55,102 (18,662) 36,440 ____________________ (1) The total payments to be made under existing non-cancelable leases for the property and equipment subject to these future minimum lease revenues. The major classes of owned property and equipment earning lease revenues as of December 31, were as follows (in thousands): Historical Accumulated Net Book 2019 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 544,549 $ (258,153) $ 286,396 Harbor and offshore tugs - U.S.-flag & foreign-flag 51,129 (17,363) 33,766 Ocean liquid tank barges - U.S.-flag 39,238 (16,171) 23,067 634,916 (291,687) 343,229 Inland Services: Towboats 50,615 (3,498) 47,117 $ 685,531 $ (295,185) $ 390,346

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	9. INCOME TAXES Income before income tax expense (benefit) and equity in earnings (losses) of 50% or less owned companies derived from U.S. and foreign companies for the years ended December 31, were as follows (in thousands): 2019 2018 2017 United States $ 41,398 $ 33,563 $ 28,546 Foreign 6,182 56,558 4,748 Eliminations and other 1,517 1,568 1,911 $ 49,097 $ 91,689 $ 35,205 The Company files a consolidated U.S. federal tax return. The components of income tax expense (benefit) for the years ended December 31, were as follows (in thousands): 2019 2018 2017 Current: State $ 739 $ 253 $ 1,136 Federal (244) 20,776 (17,181) Foreign 1,165 2,899 333 1,660 23,928 (15,712) Deferred: State 404 (3,001) 12 Federal 7,765 (12,512) (51,489) 8,169 (15,513) (51,477) $ 9,829 $ 8,415 $ (67,189) The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the years ended December 31,: 2019 2018 2017 Statutory rate 21.0 % 21.0 % 35.0 % Income subject to tonnage tax (2.3) % (1.3) % (5.9) % Dorian distribution — % — % 22.8 % Reversal of uncertain tax position — % — % (28.7) % U.S. federal income tax statutory changes — % — % (190.2) % Non-deductible expenses 1.6 % 0.2 % 0.8 % Noncontrolling interests (3.1) % (5.7) % (22.4) % Foreign earnings not subject to U.S. income tax (4.1) % (16.2) % — % Foreign taxes not creditable against U.S. income tax 1.4 % 3.2 % — % Losses of foreign subsidiaries not benefited — % — % (6.6) % Subpart F income 1.5 % 12.1 % — % State taxes 2.0 % (3.1) % 1.2 % Share award plans 0.6 % (0.3) % 2.0 % Other 1.4 % (0.7) % 1.1 % 20.0 % 9.2 % (190.9) % On December 22, 2017, the U.S. enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code, including, but not limited to, reducing the U.S. federal corporate tax rate from 35% to 21%, eliminating or capping certain deductions, imposing a mandatory one-time tax on accumulated earnings in foreign subsidiaries, introducing new tax regimes and changing how foreign earnings are subject to U.S. taxation. The statutory corporate tax rate reduction is effective for tax years beginning on or after January 1, 2018. During the year ended December 31, 2017, the Company recorded a net income tax benefit of $66.9 million as a consequence of reducing its net deferred tax liabilities to reflect the change in the statutory tax rate. During the year ended December 31, 2013, the Company provided for income taxes of $10.1 million relating to potential tax exposures surrounding the spin-off of Era Group Inc. (“Era Group”) by means of a dividend to SEACOR’s shareholders of all the issued and outstanding common stock of Era Group. During the year ended December 31, 2017, the Company reversed this provision as the statute of limitations expired. In addition, the Company reversed accumulated accrued interest of $2.0 million related to this provision, included as a reduction in interest expense in the accompanying consolidated statements of income. The components of the net deferred income tax liabilities for the years ended December 31, were as follows (in thousands): 2019 2018 Deferred tax liabilities: Property and equipment $ 121,840 $ 93,049 Long-term debt 15,395 18,355 Gains on marketable securities 459 — Investments in 50% or less owned companies 1,541 1,934 Intangible assets 706 614 Deductible goodwill 1,002 344 Other — 31 Total deferred tax liabilities 140,943 114,327 Deferred tax assets: Net operating loss carryforwards 21,385 — Capital loss carryforwards 5,192 — Share award plans 3,686 3,711 Losses on marketable securities — 8,596 Debt and equity issuance costs 515 379 Other 8,721 11,178 Total deferred tax assets 39,499 23,864 Valuation allowance (4,217) (3,957) Net deferred tax assets 35,282 19,907 Net deferred tax liabilities $ 105,661 $ 94,420 During the year ended December 31, 2019, the Company increased its valuation allowance for state net operating loss carryforwards from $4.0 million to $4.2 million. The Company's capital loss carryforwards expire in 2024.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Strategies	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments And Hedging Strategies	10. DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES Cash Flow Hedges. One of the Company’s 50% or less owned companies has subsidiaries with interest rate swap agreements designated as cash flow hedges, with an aggregate amortizing notional value of $48.0 million that mature in March 2028. These interest rate swaps call for the subsidiaries to pay a fixed rate of 1.74% on the aggregate amortizing notional value and receive a variable interest rate based on LIBOR. Another one of the Company’s 50% or less owned companies, had an interest rate swap agreement designated as a cash flow hedge that matured in April 2017. This interest rate swap called for this company to pay a fixed interest rate of 2.79% on the amortized notional value and receive a variable interest rate based on LIBOR. By entering into these interest rate swap agreements, the Company's 50% or less owned companies converted the variable LIBOR component of certain of its outstanding borrowings to a fixed interest rate. During the year ended December 31, 2019, the Company recognized gains on the fair value of these contracts of $0.1 million which is included as a component of other comprehensive income (loss). Other Derivative Instruments. The Company recognized gains on derivative instruments not designated as hedging instruments for the years ended December 31, as follows (in thousands): Derivative gains 2017 Exchange option liability on subsidiary convertible senior notes $ 19,436 Forward currency exchange, option and future contracts 291 $ 19,727 The exchange option liability on subsidiary convertible senior notes terminated on June 1, 2017 as a consequence of the Spin-Off. The Company enters and settles forward currency exchange, option and future contracts with respect to various foreign currencies. These contracts enable the Company to buy currencies in the future at fixed exchange rates, which could offset possible consequences of changes in currency exchange rates with respect to the Company’s business conducted outside of the United States. As of December 31, 2019, there were no outstanding forward currency exchange contracts.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	11. FAIR VALUE MEASUREMENTS The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines three levels of inputs that may be used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs derived from observable market data. Level 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. The Company’s financial assets and liabilities as of December 31, that are measured at fair value on a recurring basis were as follows (in thousands): Level 1 Level 2 Level 3 2019 ASSETS Cash, cash equivalents, restricted cash and restricted cash equivalents $ 78,444 $ — $ — Marketable securities (1) 7,936 — — 2018 ASSETS Cash, cash equivalents, restricted cash and restricted cash equivalents $ 147,212 $ — $ — Marketable securities (1) 30,316 — — Construction reserve funds 3,908 — — ______________________ (1) Marketable security gains (losses), net include gains of $2.2 million for the year ended December 31, 2019 related to marketable security positions held by the Company as of December 31, 2019. Marketable security gains (losses), net include losses of $12.4 million and gains of $0.1 million for the years ended December 31, 2018 and 2017, respectively, related to marketable security positions held by the Company as of December 31, 2018. The estimated fair value of the Company’s other financial assets and liabilities as of December 31, were as follows (in thousands): Carrying Level 1 Level 2 Level 3 2019 ASSETS Notes receivable from third parties (included in other receivables and other assets) $ 1,119 $ — $ 1,082 $ — Investments, at cost, in 50% or less owned companies (included in other assets) 4,201 see below LIABILITIES Long-term debt, including current portion (1) 314,466 — 330,088 — 2018 ASSETS Notes receivable from third parties (included in other receivables and other assets) $ 2,182 $ — $ 2,159 $ — Investments, at cost, in 50% or less owned companies (included in other assets) 4,300 see below LIABILITIES Long-term debt, including current portion (1) 354,625 — 353,929 — ______________________ (1) The estimated fair value includes the embedded conversion options on the Company’s 3.0% and 3.25% Convertible Senior Notes. The fair value of the Company’s long-term debt and notes receivable from third parties was estimated based upon quoted market prices or by using discounted cash flow analyses based on estimated current rates for similar types of arrangements. It was not practicable to estimate the fair value of certain of the Company’s investments, at cost, in 50% or less owned companies because of the lack of quoted market prices and the inability to estimate fair value without incurring excessive costs. Considerable judgment was required in developing certain of the estimates of fair value and, accordingly, the estimates presented herein are not necessarily indicative of the amounts that the Company could realize in a current market exchange. The Company’s non-financial assets that were measured at fair value during the years ended December 31, were as follows (in thousands): Level 1 Level 2 Level 3 2018 ASSETS Investments, at equity, and advances in 50% or less owned companies $ — $ 3,219 $ — Investments, at equity, and advances in 50% or less owned companies. During the year ended December 31, 2018, the Company marked its investment in Cleancor to fair value as a consequence of the Company acquiring its partners’ 50% interest, resulting in a gain of $0.1 million, net of tax, based on the fair value of the acquired interest (see Note 2). In addition, During the year ended December 31, 2018, the company identified indicators of impairment in one of the Company’s other 50% or less owned companies and, as a consequence, recognized an impairment charge of $0.1 million for an other-than-temporary decline in fair value. The investment was determined to have an immaterial value.

Equity Transactions

Equity Transactions	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Stockholders' Equity Note Disclosure	12. EQUITY TRANSACTIONS Stock Repurchases. SEACOR’s Board of Directors previously approved a securities repurchase plan that authorizes the Company to acquire its Securities, which may be acquired through open market purchases, privately negotiated transactions or otherwise, depending on market conditions (see Note 7). During the year ended December 31, 2019, the Company acquired 3,912, shares of Common Stock for treasury under the Securities repurchase plan for an aggregate purchase price of $0.1 million. As of December 31, 2019, the Company's repurchase authority for the Securities was $129.9 million. During the years ended December 31, 2018 and 2017, the Company acquired no shares of Common Stock for treasury under the Securities repurchase plan. During the years ended December 31, 2019 and 2017, the Company acquired for treasury 8,338 and 212,659 shares of Common Stock, respectively, for aggregate purchase prices of $0.4 million and $12.3 million, respectively, from its employees to cover their tax withholding obligations related to share award transactions. These shares were purchased in accordance with the terms of the Company’s Share Incentive Plans and not pursuant to the repurchase authorizations granted by SEACOR’s Board of Directors. Stock Issuances. On June 1, 2017, the Company completed the Spin-off of SEACOR Marine by means of a dividend of all of the issued and outstanding common stock of SEACOR Marine to SEACOR’s shareholders. In the Spin-off, holders of SEACOR Common Stock received approximately 1.005 shares of SEACOR Marine common stock for each share of SEACOR Common Stock held as of the record date for the Spin-off. On December 20, 2017, the Company distributed 3,977,135 shares of Dorian common stock with a value of $31.4 million (based on the closing share price on that date) to its stockholders with each holder of Common Stock receiving approximately 0.2215 shares of Dorian common stock for each share of SEACOR Common Stock held as of the record date for such distribution. The Compensation Committee of the Board of Directors elected, at its discretion, to distribute shares of Dorian on the Company’s restricted shares outstanding on the record date rather than depositing the shares in escrow pending the lapsing of restrictions. On August 2, 2019, the Company acquired the Remaining SEA-Vista Interest (See Note 1). As part of the consideration for the Remaining SEA-Vista Interest, the Company issued the Consideration Shares in a private placement exempt from registration under the Securities Act of 1933, as amended. In connection with the issuance of the Consideration Shares, the Seller agreed to certain restrictions on its ability to dispose of the Consideration Shares pursuant to a Lock-Up Agreement, dated August 2, 2019, between the Company and the Seller (the “Lock-Up Agreement”). Pursuant to the Lock-Up Agreement, the Seller was prohibited from distributing the Consideration Shares to its limited partners prior to November 1, 2019 and from otherwise transferring or disposing of the Consideration Shares in any other manner on or prior to February 2, 2020. On November 15, 2019, the Seller distributed the shares to its partners, effectively terminating the Lock-Up Agreement.

Noncontrolling Interests in Sub

Noncontrolling Interests in Subsidiaries	12 Months Ended
	Dec. 31, 2019
Noncontrolling Interest [Abstract]
Noncontrolling Interests in Subsidiaries	13. NONCONTROLLING INTERESTS IN SUBSIDIARIES Noncontrolling interests in the Company’s consolidated subsidiaries as of December 31, were as follows (in thousands): Noncontrolling Interests 2019 2018 Ocean Services: SEA-Vista 49.0% $ — $ 148,665 Inland Services: Other 3.0 % – 51.8% 785 862 Other 5.0% 3 161 $ 788 $ 149,688 SEA-Vista. SEA-Vista owns and operates the Company’s fleet of U.S.-flag petroleum and chemical carriers used in the U.S. coastwise trade of crude oil, petroleum and specialty chemical products. On August 2, 2019, the Company acquired the Remaining SEA-Vista Interest (See Notes 1 and 12). During the seven months ended July 31, 2019, the net income of SEA-Vista was $14.8 million, of which $7.2 million was attributable to noncontrolling interests. During the year ended December 31, 2018, the net income of SEA-Vista was $51.2 million, of which $25.1 million was attributable to noncontrolling interests. During the year ended December 31, 2017, the net income of SEA-Vista was $45.9 million, of which $22.5 million was attributable to noncontrolling interests.

Savings, Multi-Employer And Def

Savings, Multi-Employer And Defined Benefit Pension Plans	12 Months Ended
	Dec. 31, 2019
Deferred Compensation Arrangements [Abstract]
Savings, Multi-Employer And Defined Benefit Pension Plans	14. SAVINGS, MULTI-EMPLOYER AND DEFINED BENEFIT PENSION PLANS SEACOR Savings Plan. The Company provides a defined contribution plan (the “Savings Plan”) for its eligible U.S.-based employees. The Company’s contribution to the Savings Plan is limited to 3.5% of an employee’s wages depending upon the employee’s level of voluntary wage deferral into the Savings Plan and is subject to annual review by the Board of Directors. The Company’s Savings Plan costs were $2.2 million, $2.0 million and $1.8 million for the years ended December 31, 2019, 2018 and 2017, respectively. SEACOR Deferred Compensation Plan. In 2005, the Company established a non-qualified deferred compensation plan, as amended (the “Deferred Compensation Plan”) to provide certain highly compensated executives and non-employee directors the ability to defer receipt of up to 75% of their cash base salary and up to 100% of their cash bonus. Each participant’s compensation deferrals are credited to a bookkeeping account and, subject to certain restrictions, each participant may elect to have their cash deferrals in such account indexed against one or more investment options, solely for purposes of determining amounts payable under the Deferred Compensation Plan (the Company is not obligated to actually invest any deferred amounts in the selected investment options). Participants may receive a distribution of deferred amounts, plus any earnings thereon (or less any losses), on a date specified by the participant or, if earlier, upon a separation from service or upon a change of control (as defined). All distributions to participants following a separation from service shall be in the form of a lump sum, except if such separation qualifies as “retirement” under the terms of the plan, in which case it may be paid in installments if previously elected by the participant. Distributions to “Key Employees” upon a separation from service (other than due to death) will not commence until at least six months after the separation from service. Participants are always 100% vested in the amounts they contribute to their Deferred Compensation Plan accounts. The Company, at its option, may contribute amounts to participants’ accounts, which may be subject to vesting requirements. The obligations of the Company to pay deferred compensation under the Deferred Compensation Plan are general unsecured obligations of the Company and rank equally with other unsecured indebtedness of the Company that is outstanding from time to time. As of December 31, 2019 and 2018 the Company had obligations of $0.8 million and $0.6 million, respectively, related to the Deferred Compensation Plan that are included in the accompanying consolidated balance sheets as deferred gains and other liabilities. The total amount of the Company’s obligation under the Deferred Compensation Plan will vary depending upon the level of participation by participants and the amount of compensation that participants elect to defer under the plan. The duration of the Deferred Compensation Plan is indefinite (subject to the Board of Directors’ discretion to amend or terminate the plan). AMOPP and SPP. Certain subsidiaries of the Company are participating employers in two industry-wide, multi-employer defined benefit pension plans, the American Maritime Officers Pension Plan (the “AMOPP” - EIN: 13-1936709) and the Seafarers Pension Plan (the “SPP” - EIN: 13-6100329). The Company’s participation in these plans relates to certain employees of the Company’s Ocean Services business segment. During the years ended December 31, 2019, 2018 and 2017, the Company made contributions of $2.6 million, $2.5 million and $2.4 million, respectively in the aggregate to the AMOPP and SPP. Under federal pension law, a plan is in "endangered" status if the funded percentage (plan assets divided by its liabilities) is less than 80% and in "critical" status if the funded percentage is less than 65% (other factors may also apply). For the 2019 plan year, the AMOPP was neither in endangered status nor critical status. The Company received notification from the AMOPP that the Company's withdrawal liability as of September 30, 2018, the latest period for which an actuarial valuation is available, would have been $28.1 million. That liability may change in future years based on various factors, primarily employee census. As of December 31, 2019, the Company had no intention to withdraw from the AMOPP and no deficit amounts have been invoiced. Depending upon the results of the future actuarial valuations, it is possible that the AMOPP will experience further funding deficits, requiring the Company to recognize additional payroll related operating expenses in the periods invoices are received or contribution levels are increased. The SPP was neither in endangered nor critical status for the 2018 plan year, the latest period for which a report is available, as the SPP was fully funded. Multi-Employer Defined Contribution Plans. In accordance with collective bargaining agreements between the Company and the American Maritime Officers Union, the latest of which expires on August 31, 2022, the Seafarers International Union, the latest of which expires on July 31, 2022, the Masters Mates and Pilots Union, which expires July 2, 2022 and the Marine Engineer Benefit Association, which expires July 2, 2022, the Company makes periodic contributions to various defined contribution and 401(k) plans for the benefit of the participants. The contributions to these plans are expensed as incurred and are included in operating expenses in the accompanying consolidated statements of income. During the years ended December 31, 2019, 2018 and 2017, the Company made contributions of $1.1 million, $1.0 million and $1.0 million, respectively, in the aggregate to these plans. During the years ended December 31, 2019, 2018 and 2017, none of the Company’s contributions to any of these plans exceeded 5% of total contributions to each plan and the Company did not pay any material surcharges. As of December 31, 2019, there is no required minimum future contributions to these plans. The Company’s obligations for future contributions are based upon the number of employees subject to the collective bargaining agreements, their rates of pay and the number of days worked. Future negotiations of collective bargaining agreements between the Company and the participating unions, including the contribution levels for these plans or any additional plans that may come into existence, may result in increases to the Company’s wage and benefit costs and those increases may be material. ISH Retirement Plan. ISH sponsored a defined benefit pension plan (the “ISH Retirement Plan”) covering non-union employees prior to its acquisition by the Company on July 3, 2017 (see Note 2). The ISH Retirement Plan generally provided participants with benefits based on years of service and compensation levels for participants hired prior to September 1, 2006. From that date forward, the benefit was calculated prospectively under a cash balance formula with pay credits based on age plus service years and interest credits based on an as defined U.S. treasury rate. Effective July 3, 2017, in conjunction with the Plan, an amendment was made to the ISH Retirement Plan that fully vested all active participants as of January 1, 2017 and froze the retirement benefits effective August 31, 2017. As of August 31, 2017, all retirement benefits earned were fully preserved and will be paid in accordance with the ISH Retirement Plan and legal requirements. The funded status of the ISH Retirement Plan as of December 31, was as follows (in thousands): 2019 2018 Fair Value of Assets $ 37,723 $ 34,923 Projected Benefit Obligation (37,583) (34,299) Funded Status (1) $ 140 $ 624 _____________________ (1) Included in other assets in the accompanying consolidated balance sheets. During the years ended December 31, 2019 and 2018, pension expense was $0.5 million and $0.9 million, respectively. During the period July 3, 2017 through December 31, 2017, pension income was $1.3 million. The significant assumptions used in determining the projected benefit obligation as of December 31, and pension expense for the years ended December 31, were as follows: 2019 2018 Discount rate 3.10 % 4.05 % Rate of increase in compensations levels (1) N/A N/A CPI 2.25 % 2.25 % Cash balance interest credits (compounded annually) 4.00 % 4.00 % Expected long-term rate of return on plan assets 6.00 % 6.75 % _____________________ (1) Retirement benefits were frozen as of August 31, 2017. The future benefit payments expected to be paid in each of the next five fiscal years are as follows (in thousands): 2020 2,250 2021 2,120 2022 2,200 2023 2,180 2024 2,160

Share Based Compensation

Share Based Compensation	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share Based Compensation	15. SHARE BASED COMPENSATION Share Incentive Plans. SEACOR’s stockholders approved the 2014 Share Incentive Plan to provide for the grant of options to purchase shares of Common Stock, stock appreciation rights, restricted stock, stock awards, performance awards and restricted stock units to non-employee directors, key officers and employees of the Company. The 2014 Share Incentive Plan superseded the 2007 Share Incentive Plan (collectively including all predecessor plans, the “Share Incentive Plans”). The Compensation Committee of the Board of Directors administers the Share Incentive Plans. A total of 6,650,000 shares of Common Stock have been authorized for grant under the Share Incentive Plans. All shares issued pursuant to such grants are newly issued shares of Common Stock. The exercise price per share of options granted cannot be less than 100% of the fair market value of Common Stock at the date of grant under the Share Incentive Plans. Grants to date have been limited to stock awards, restricted stock, restricted stock units and options to purchase shares of Common Stock. Restricted stock typically vests from one one Employee Stock Purchase Plans. SEACOR’s stockholders approved an amendment to the 2009 Employee Stock Purchase Plan (collectively including all predecessor plans, the “Employee Stock Purchase Plans”) increasing the shares of Common Stock available for issuance under the plan by 300,000 and extending the term to ten years from the date of the Company’s 2018 annual meeting of stockholders. The Employee Stock Purchase Plans permit the Company to offer Common Stock for purchase by eligible employees at a price equal to 85% of the lesser of (i) the fair market value of Common Stock on the first day of the offering period or (ii) the fair market value of Common Stock on the last day of the offering period. Common Stock is made available for purchase under the Employee Stock Purchase Plans for six-month offering periods. The Employee Stock Purchase Plans are intended to comply with Section 423 of the Internal Revenue Code of 1986, as amended (the “Code”), but is not intended to be subject to Section 401(a) of the Code or the Employee Retirement Income Security Act of 1974. The Board of Directors of SEACOR may amend or terminate the Employee Stock Purchase Plans at any time; however, no increase in the number of shares of Common Stock reserved for issuance under the Employee Stock Purchase Plans may be made without stockholder approval. A total of 900,000 shares of Common Stock have been approved for purchase under the Employee Stock Purchase Plans with all shares issued from those held in treasury. Share Award Transactions. The following transactions have occurred in connection with the Company’s share based compensation plans during the years ended December 31,: 2019 2018 2017 Restricted stock awards granted 149,950 121,850 153,100 Restricted stock awards forfeited (4,230) — (2,444) Director stock awards granted 2,125 2,875 1,750 Stock Option Activities: Outstanding as of the beginning of year 1,467,391 1,546,014 1,639,865 Granted (1) 165,650 142,550 1,013,893 Exercised (165,893) (220,694) (562,587) Forfeited (5,200) — (3,374) Expired (7,874) (479) (541,783) Outstanding as of the end of year 1,454,074 1,467,391 1,546,014 Employee Stock Purchase Plans shares issued 44,383 45,251 36,552 Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year (2) 539,414 884,218 896,265 ______________________ (1) On June 2, 2017, the Company granted 846,353 stock options to existing option holders under make-whole provisions upon the Spin-off. (2) Shares available for future grants and ESPP purchases were adjusted on June 2, 2017 to reflect the Spin-off in accordance with make-whole provisions of the plans. During the years ended December 31, 2019, 2018 and 2017, the Company recognized $5.2 million, $4.0 million and $32.5 million, respectively, of compensation expense related to stock awards, stock options, employee stock purchase plans purchases and restricted stock (collectively referred to as “share awards”). During 2017, compensation expense related to stock awards included $16.6 million associated with the Spin-off and the accelerated vesting of incentive share awards in advance of changes in the U.S. federal income tax code. As of December 31, 2019, the Company had approximately $12.8 million in total unrecognized compensation costs of which $4.5 million and $3.5 million are expected to be recognized in 2020 and 2021, respectively, with the remaining balance recognized through 2024. The weighted average values of grants under the Company’s Share Incentive Plans were $27.67, $29.72 and $37.20 for the years ended December 31, 2019, 2018 and 2017, respectively. The fair value of each option granted during the years ended December 31, 2019, 2018 and 2017, is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions: (a) no dividend yield, (b) weighted average expected volatility of 28.2%, 26.6% and 25.5%, respectively, (c) weighted average discount rates of 1.88%, 2.78% and 1.92%, respectively, and (d) expected lives of 5.75 years, 5.58 years and 5.59 years, respectively. During the year ended December 31, 2019, the number of shares and the weighted average grant price of restricted stock transactions were as follows: Restricted Stock Number of Weighted Nonvested as of December 31, 2018 121,850 $ 46.66 Granted 149,950 $ 43.20 Vested (26,390) $ 46.58 Forfeited (4,230) $ 44.66 Nonvested as of December 31, 2019 241,180 $ 44.55 During the years ended December 31, 2019 and 2017, the total grant date fair value of restricted stock that vested was $1.2 million and $26.1 million, respectively. During the year ended December 31, 2018, no restricted stock vested. During the year ended December 31, 2019, the number of shares and the weighted average exercise price on stock option transactions were as follows: Total Options Number of Weighted Outstanding, as of December 31, 2018 1,467,391 $ 41.72 Granted 165,650 $ 43.77 Exercised (165,893) $ 31.61 Forfeited (5,200) $ 43.47 Expired (7,874) $ 48.84 Outstanding, as of December 31, 2019 1,454,074 $ 43.19 Outstanding and Exercisable, as of December 31, 2019 1,013,705 $ 43.60 During the years ended December 31, 2019, 2018 and 2017, the aggregate intrinsic value of exercised stock options was $2.5 million, $3.9 million and $5.6 million, respectively. As of December 31, 2019, the weighted average remaining contractual term for total outstanding stock options and vested/exercisable stock options was 5.10 and 3.90 years, respectively. As of December 31, 2019, the aggregate intrinsic value of all options outstanding and all vested/exercisable options outstanding was $3.8 million and $2.7 million, respectively.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	16. RELATED PARTY TRANSACTIONS The Company manages barge pools as part of its Inland Services segment. Pursuant to the pooling agreements, operating revenues and expenses of participating barges are combined and the net results are allocated on a pro-rata basis based on the number of barge days contributed by each participant. Companies controlled by Mr. Fabrikant, the Executive Chairman and Chief Executive Officer of SEACOR, and trusts established for the benefit of Mr. Fabrikant’s children, own barges that participate in the barge pools managed by the Company. Mr. Fabrikant and his affiliates were participants in the barge pools prior to the acquisition of SCF Marine Inc. by SEACOR in 2000. During the years ended December 31, 2019, 2018 and 2017, Mr. Fabrikant and his affiliates earned $0.5 million, $0.9 million and $0.6 million, respectively, of net barge pool results (after payment of $0.1 million, $0.1 million and $0.1 million, respectively, in management fees to the Company). As of December 31, 2019 and 2018, the Company owed Mr. Fabrikant and his affiliates $0.1 million and $0.5 million, respectively, for undistributed net barge pool results. Mr. Fabrikant is a director of SEACOR Marine. The Company has provided certain transition services to SEACOR Marine related to the Spin-off and the total amount earned from these transition services during the years ended December 31, 2019, 2018 and 2017 was $0.6 million, $4.6 million and $3.5 million, respectively.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	17. COMMITMENTS AND CONTINGENCIES The Company's capital commitments as of December 31, 2019 by year of expected payment were as follows (in thousands): 2020 2021 2022 Total Ocean Services $ 22,394 $ 30,965 $ 2,636 $ 55,995 Inland Services 5,663 — — 5,663 Other 582 — — 582 $ 28,639 $ 30,965 $ 2,636 $ 62,240 Ocean Services' capital commitments included four U.S.-flag harbor tugs and an interest in two foreign-flag rail ferries. Inland Services’ capital commitments included four inland river dry-cargo barges, two inland river towboats, other equipment, and vessel and terminal improvements. Subsequent to December 31, 2019, the Company committed to purchase two inland river dry-cargo barges and other property and equipment for $2.5 million. During 2012, the Company sold National Response Corporation (“NRC”), NRC Environmental Services Inc., SEACOR Response Ltd., and certain other subsidiaries to J.F. Lehman & Company, a private equity firm (the “SES Business Transaction”). On December 15, 2010, O’Brien’s Response Management L.L.C. (“ORM”) and NRC were named as defendants in several “master complaints” filed in the overall multi-district litigation relating to the Deepwater Horizon oil spill response and clean-up in the Gulf of Mexico (the "DWH Response"), which is currently pending in the U.S. District Court for the Eastern District of Louisiana (the “MDL”). The “B3” master complaint naming ORM and NRC asserted various claims on behalf of a putative class against multiple defendants concerning the clean-up activities generally and the use of dispersants specifically. Both prior to and following the filing of the aforementioned “B3” master complaint, individual civil actions naming the Company, ORM, and/or NRC alleging B3 exposure-based injuries and/or damages were consolidated with the MDL and stayed pursuant to court order. On February 16, 2016, all but eleven “B3” claims against ORM and NRC were dismissed with prejudice (the “B3 Dismissal Order”). On August 2, 2016, the Court granted an omnibus motion for summary judgment as it concerns ORM and NRC in its entirety, dismissing the remaining eleven plaintiffs’ claims against ORM and NRC with prejudice (the “Remaining Eleven Plaintiffs’ Dismissal Order”). The deadline to appeal both of these orders has expired. The last remaining claim against the Company in connection with the "B3" master complaint was dismissed with prejudice, by an order of the Court granted on July 25, 2019. On February 18, 2011, Triton Asset Leasing GmbH, Transocean Holdings LLC, Transocean Offshore Deepwater Drilling Inc., and Transocean Deepwater Inc. (collectively “Transocean”) named ORM and NRC as third-party defendants in a Rule 14(c) Third-Party Complaint in Transocean’s own Limitation of Liability Act action, which is part of the overall MDL, tendering to ORM and NRC the claims in the “B3” master complaint that have already been asserted against ORM and NRC. Various contribution and indemnity cross-claims and counterclaims involving ORM and NRC were subsequently filed. The Company believes that the potential exposure, if any, resulting therefrom has been reduced as a result of the various developments in the MDL, including the B3 Dismissal Order and Remaining Eleven Plaintiffs’ Dismissal Order, and does not expect that these matters will have a material effect on its consolidated financial position, results of operations or cash flows. Separately, on March 2, 2012, the Court announced that BP Exploration and Production Inc. (“BPXP”) and BP America Production Company (“BP America,” and with BPXP, “BP”) and the Plaintiffs had reached an agreement on the terms of two proposed class action settlements that will resolve, among other things, Plaintiffs’ economic loss and property damage claims and clean-up related claims against BP. The Company, ORM, and NRC had no involvement in negotiating or agreeing to the terms of either settlement, nor are they parties or signatories thereto. The BP settlement pertaining to personal injury claims (the “Medical Settlement”) purported to resolve the “B3” claims asserted against BP and also established a right for class members to pursue individual claims against BP (but not ORM or NRC) for “later-manifested physical conditions,” defined in the Medical Settlement to be physical conditions that were “first diagnosed” after April 16, 2012 and which are claimed to have resulted from exposure during the DWH Response. The back-end litigation-option (“BELO”) provision of the Medical Settlement has specifically-delineated procedures and limitations, should any “B3” class member seek to invoke their BELO right. For example, there are limitations on the claims and defenses that can be asserted, as well as on the issues, elements, and proofs that may be litigated at any trial and the potential recovery for any Plaintiff. Notwithstanding that the Company, ORM, and NRC are listed on the Medical Settlement’s release as to claims asserted by Plaintiffs, the Medical Settlement still permits BP to seek indemnity from any party, to the extent BP has a valid indemnity right. The Medical Settlement was approved by the Court on January 11, 2013 and made effective on February 12, 2014. As of mid-January 2020, BP has tendered approximately 2,380 claims pursuant to the Medical Settlement’s BELO provision for indemnity to ORM and approximately 230 of such claims to NRC. Recently, approximately 450 of the claims that were tendered by BP to ORM and approximately 35 of the claims tendered to NRC have been dismissed with prejudice. ORM and NRC have rejected all of BP’s indemnity demands relating to the Medical Settlement’s BELO provision and on February 14, 2019 commenced a legal action against BPXP and BP America with respect to same. That action, captioned O’Brien’s Response Management, L.L.C. et al. v. BP Exploration & Production Inc. et al. , Case No. 2:19-CV-01418-CJB-JCW (E.D. La.) (the “Declaratory Judgment Action”), seeks declaratory relief that neither ORM nor NRC have any indemnity obligation to BP with respect to the exposure-based claims expressly contemplated by the Medical Settlement’s BELO provision, nor any contribution, in light of BP’s own actions and conduct over the past nine years (including its complete failure to even seek indemnity) and the resultant prejudice to ORM and NRC; that any indemnity or contribution rights BP may have once had with respect to these personal injury and exposure claims were extinguished once the Medical Settlement was approved by the MDL Court in 2013; and that the immunity already afforded to ORM and NRC via the B3 Dismissal Order and the Remaining Eleven Plaintiffs’ Dismissal Order operates to bar any indemnity or contribution claims against them by BP. BP subsequently proceeded to begin tendering personal injury claims to ORM and NRC that are being pursued by plaintiffs who opted out of the Medical Settlement and who are thus proceeding with their “B3” claims in their ordinary course (as opposed to pursuant to the Medical Settlement’s BELO provision). ORM and NRC also rejected these demands, and amended its Declaratory Judgment Action on December 11, 2019 to cover BP’s indemnity demands for these opt out claims as well. On October 16, 2019, BP asserted four amended counterclaims against ORM and NRC, as well as two claims against ORM’s insurer (Navigators). Those amended counterclaims are breach of contract against ORM for failing to indemnify BP or name BP as an additional insured on the Navigators policy, declaratory judgment that NRC must indemnify BP under certain circumstances, and unjust enrichment against ORM and NRC. ORM and NRC moved to dismiss the last three of those counterclaims. That motion to dismiss was fully briefed as of January 10, 2020, and remains pending. The Court also ordered the parties to file simultaneous judgment on the pleadings briefs by February 14, 2020, and any oppositions by March 16, 2020. Generally, the Company, ORM, and NRC believe that BP’s indemnity demands with respect to any “B3” claims, including those involving Medical Settlement class members invoking BELO rights and those involving Medical Settlement opt-out Plaintiffs, are untimely and improper, and intend to vigorously defend their interests. Moreover, ORM has contractual indemnity coverage for the above-referenced claims through its separate agreements with sub-contractors that worked for ORM during the DWH Response and has preserved their rights in that regard while the Declaratory Judgment Action is pending. Overall, however, the Company believes that both of BP’s settlements have reduced the potential exposure in connection with the various cases relating to the DWH Response. The Company is unable to estimate the potential exposure, if any, resulting from these claims, but does not expect that they will have a material effect on its consolidated financial position, results of operations or cash flows. In the ordinary course of the Company’s business, it may agree to indemnify its counterparty to an agreement. If the indemnified party makes a successful claim for indemnification, the Company would be required to reimburse that party in accordance with the terms of the indemnification agreement. Indemnification agreements generally, but not always, are subject to threshold amounts, specified claim periods and other restrictions and limitations. In connection with the SES Business Transaction, the Company remains contingently liable for work performed in connection with the DWH Response. Pursuant to the agreement governing the sale, the Company’s potential liability to the purchaser may not exceed the consideration received by the Company for the SES Business Transaction. The Company is currently indemnified under contractual agreements with BP for the potential “B3” liabilities relating to the DWH Response; this indemnification is unrelated to, and thus not impacted by, the indemnification BP has demanded and discussed above. In the ordinary course of its business, the Company becomes involved in various other litigation matters including, among other things, claims by third parties for alleged property damages and personal injuries. Management has used estimates in determining the Company’s potential exposure to these matters and has recorded reserves in its financial statements related thereto where appropriate. It is possible that a change in the Company’s estimates of that exposure could occur, but the Company does not expect such changes in estimated costs would have a material effect on the Company’s consolidated financial position, results of operations or cash flows.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Information	18. SEGMENT INFORMATION The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments. Ocean Inland Witt Other Corporate Total For the year ended December 31, 2019 Operating Revenues: External customers 423,288 267,334 101,663 7,681 — 799,966 Intersegment — — 120 — (120) — 423,288 267,334 101,783 7,681 (120) 799,966 Costs and Expenses: Operating 280,809 229,418 68,052 5,464 (110) 583,633 Administrative and general 40,215 13,140 25,959 3,489 22,714 105,517 Depreciation and amortization 40,986 23,262 835 1,982 1,506 68,571 362,010 265,820 94,846 10,935 24,110 757,721 Gains (Losses) on Asset Dispositions, Net 1,291 1,602 18 32 (33) 2,910 Operating Income (Loss) 62,569 3,116 6,955 (3,222) (24,263) 45,155 Other Income (Expense): Foreign currency losses, net (98) (212) (1) — (1) (312) Other, net (112) — (463) 431 10 (134) Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax (669) (6,520) 902 1,037 — (5,250) Segment Profit (Loss) 61,690 (3,616) 7,393 (1,754) Other Income (Expense) not included in Segment Profit 4,388 Plus Equity in Losses included in Segment Profit 5,250 Income Before Taxes and Equity in Losses 49,097 Capital Expenditures 4,859 30,040 47 1,997 843 37,786 As of December 31, 2019 Property and Equipment: Historical cost 932,267 469,120 1,134 8,897 30,964 1,442,382 Accumulated depreciation (380,553) (216,296) (993) (2,450) (23,732) (624,024) Net property and equipment 551,714 252,824 141 6,447 7,232 818,358 Operating Lease Right-of-Use Assets 109,460 31,338 3,045 — 696 144,539 Investments, at Equity, and Advances to 50% or Less Owned Companies 78,049 55,092 1,274 22,693 — 157,108 Inventories 2,233 2,510 266 246 — 5,255 Goodwill 1,852 2,343 28,506 — — 32,701 Intangible Assets 7,637 7,497 5,862 — — 20,996 Other current and long-term assets, excluding cash and near cash assets (1) 54,842 71,043 108,373 4,760 8,617 247,635 Segment Assets 805,787 422,647 147,467 34,146 Cash and near cash assets (1) 86,380 Total Assets 1,512,972 ______________________ (1) Cash and near cash assets includes cash, cash equivalents, restricted cash, restricted cash equivalents and marketable securities Ocean Inland Witt Other Corporate Total For the year ended December 31, 2019 Revenues from Contracts with Customers: Voyage charters 46,381 — — — — 46,381 Contracts of affreightment 24,540 202,317 — — — 226,857 Tariff 79,757 — — — — 79,757 Unit freight 63,420 — — — — 63,420 Terminal operations — 16,562 — — — 16,562 Fleeting operations — 17,264 — — — 17,264 Logistics services — 15,155 — — — 15,155 Time and material contracts — — 87,167 — — 87,167 Retainer contracts — — 9,874 — — 9,874 Product sales (1) — — — 5,555 — 5,555 Other 3,844 5,134 4,742 1,144 (120) 14,744 Lease Revenues: Time charter, bareboat charter and rental income 205,346 10,902 — 982 — 217,230 423,288 267,334 101,783 7,681 (120) 799,966 ______________________ (1) Costs of goods sold related to product sales was $4.5 million. Ocean Inland Witt Other Corporate Total For the year ended December 31, 2018 Operating Revenues: External customers 414,844 285,688 131,629 3,589 — 835,750 Intersegment — — 80 — (80) — 414,844 285,688 131,709 3,589 (80) 835,750 Costs and Expenses: Operating 269,294 237,010 83,203 2,455 (114) 591,848 Administrative and general 40,179 13,139 24,772 1,841 22,976 102,907 Depreciation and amortization 46,270 24,164 1,944 501 1,700 74,579 355,743 274,313 109,919 4,797 24,562 769,334 Gains on Asset Dispositions 12,887 6,659 — 37 — 19,583 Operating Income (Loss) 71,988 18,034 21,790 (1,171) (24,642) 85,999 Other Income (Expense): Foreign currency losses, net (168) (2,002) (28) (3) (63) (2,264) Other, net 570 51 — 54,249 94 54,964 Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax 3,632 (5,686) 203 1,779 — (72) Segment Profit 76,022 10,397 21,965 54,854 Other Income (Expense) not included in Segment Profit (47,010) Plus Equity in Losses included in Segment Profit 72 Income Before Taxes and Equity in Losses 91,689 Capital Expenditures 39,207 8,298 — 2,639 128 50,272 As of December 31, 2018 Property and Equipment: Historical cost 930,230 438,848 1,227 6,892 30,132 1,407,329 Accumulated depreciation (341,999) (195,094) (1,031) (490) (22,205) (560,819) Net property and equipment 588,231 243,754 196 6,402 7,927 846,510 Investments, at Equity, and Advances to 50% or Less Owned Companies 73,939 57,899 471 24,577 — 156,886 Inventories 2,196 1,997 179 158 — 4,530 Goodwill 1,852 2,350 28,506 — — 32,708 Intangible Assets 8,965 8,991 6,595 — — 24,551 Other current and long-term assets, excluding cash and near cash assets (1) 48,770 78,903 81,410 2,142 13,178 224,403 Segment Assets 723,953 393,894 117,357 33,279 Cash and near cash assets (1) 181,436 Total Assets 1,471,024 ______________________ (1) Cash and near cash assets includes cash, cash equivalents, restricted cash, restricted cash equivalents, marketable securities and construction reserve funds. Ocean Inland Witt Other Corporate Total For the year ended December 31, 2018 Revenues from Contracts with Customers: Voyage charters 73,979 — — — — 73,979 Contracts of affreightment 11,872 219,375 — — — 231,247 Tariff 74,157 — — — — 74,157 Unit freight 58,326 — — — — 58,326 Terminal operations — 21,501 — — — 21,501 Fleeting operations — 17,888 — — — 17,888 Logistics services — 14,309 — — — 14,309 Time and material contracts — — 119,196 — — 119,196 Retainer contracts — — 10,124 — — 10,124 Product sales (1) — — — 2,686 — 2,686 Other 3,268 5,223 2,389 425 (80) 11,225 Lease Revenues: Time charter, bareboat charter and rental income 193,242 7,392 — 478 — 201,112 414,844 285,688 131,709 3,589 (80) 835,750 ______________________ (1) Costs of goods sold related to product sales was $2.1 million. Ocean Inland Witt Other Corporate Total As Adjusted As Adjusted For the year ended December 31, 2017 Operating Revenues: External customers 352,876 248,452 49,055 464 — 650,847 Intersegment — — 101 — (101) — 352,876 248,452 49,156 464 (101) 650,847 Costs and Expenses: Operating 195,285 206,836 32,017 — (301) 433,837 Administrative and general 36,548 16,558 13,438 831 35,731 103,106 Depreciation and amortization 46,073 25,852 819 — 2,314 75,058 277,906 249,246 46,274 831 37,744 612,001 Gains (Losses) on Asset Dispositions and Impairments, Net (323) 11,960 — — — 11,637 Operating Income (Loss) 74,647 11,166 2,882 (367) (37,845) 50,483 Other Income (Expense): Derivative gains, net — — — — 19,727 19,727 Foreign currency gains (losses), net (130) 272 50 6 125 323 Other, net 327 — — (301) 230 256 Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax 7,664 (5,191) 174 305 — 2,952 Segment Profit (Loss) 82,508 6,247 3,106 (357) Other Income (Expense) not included in Segment Profit (35,584) Less Equity in Earnings included in Segment Profit (2,952) Income Before Taxes and Equity in Earnings 35,205 Capital Expenditures 80,006 34,322 60 — 207 114,595 As of December 31, 2017 Property and Equipment: Historical cost 901,076 448,035 1,227 — 30,131 1,380,469 Accumulated depreciation (299,528) (181,573) (938) — (20,505) (502,544) Net property and equipment 601,548 266,462 289 — 9,626 877,925 Investments, at Equity, and Advances to 50% or Less Owned Companies 52,003 66,479 777 54,182 — 173,441 Inventories 2,352 1,934 91 — — 4,377 Goodwill 1,852 2,403 28,506 — — 32,761 Intangible Assets 10,293 10,486 7,327 — — 28,106 Other current and long-term assets, excluding cash and near cash assets (1) 49,498 71,500 28,398 1,391 9,611 160,398 Segment Assets 717,546 419,264 65,388 55,573 Cash and near cash assets (1) 336,328 Total Assets 1,613,336 ______________________ (1) Cash and near cash assets includes cash, cash equivalents, restricted cash, restricted cash equivalents, marketable securities and construction reserve funds. Ocean Inland Witt Other Corporate Total As Adjusted As Adjusted For the year ended December 31, 2017 Revenues from Contracts with Customers: Voyage charters 33,623 — — — — 33,623 Contracts of affreightment 15,181 189,080 — — — 204,261 Tariff 68,266 — — — — 68,266 Unit freight 50,693 — — — — 50,693 Terminal operations — 21,488 — — — 21,488 Fleeting operations — 15,561 — — — 15,561 Logistics services — 8,868 — — — 8,868 Time and material contracts — — 33,352 — — 33,352 Retainer contracts — — 10,192 — — 10,192 Other 1,879 5,163 5,612 464 (101) 13,017 Lease Revenues: Time charter, bareboat charter and rental income 183,234 8,292 — — — 191,526 352,876 248,452 49,156 464 (101) 650,847

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	19. DISCONTINUED OPERATIONS The Company’s discontinued operations consist of SEACOR Marine and ICP, as following the Spin-off and sale, respectively, the Company has no continuing involvement in either of these businesses (see Note 1). Summarized selected operating results of the Company’s discontinued operations for the years ended December 31, were as follows (in thousands): 2017 SEACOR Marine Operating Revenues $ 62,291 Costs and Expenses: Operating 65,888 Administrative and general 29,682 Depreciation and amortization 22,181 117,751 Gains on Asset Dispositions, Net 4,219 Operating Loss (51,241) Other Income, Net 1,780 Income Tax Benefit (12,931) Equity in Earnings of 50% or Less Owned Companies, Net of Tax 1,663 Net Loss $ (34,867) Net Loss Attributable to Noncontrolling Interests $ (1,892) ICP Operating Revenues $ 78,061 Costs and Expenses: Operating 76,306 Administrative and general 2,140 Depreciation and amortization 2,354 80,800 Operating Loss (2,739) Other Income, Net (including gain on sale of business) 20,557 Income Tax Expense 7,818 Net Income $ 10,000 Net Loss Attributable to Noncontrolling Interests $ (539) Eliminations Operating Revenues $ (1,176) Costs and Expenses: Operating (1,289) Administrative and general (42) (1,331) Operating Income 155 Other Income, Net 1,738 Income Tax Expense 663 Net Income $ 1,230 Loss from Discontinued Operations, Net of Tax $ (23,637)

Quarterly Financial Information

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Data [Abstract]
Quarterly Financial Information (Unaudited)	21. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Selected financial information for interim quarterly periods is presented below (in thousands, except share data). Earnings per common share of SEACOR Holdings Inc. are computed independently for each of the quarters presented and the sum of the quarterly earnings per share may not necessarily equal the total for the year. Three Months Ended Dec. 31, Sept. 30, June 30, March 31, 2019 Operating Revenues $ 192,761 $ 200,658 $ 197,023 $ 209,524 Operating Income 2,562 12,519 11,106 18,968 Net Income (Loss) (1,912) 5,861 17,001 13,068 Net Income (Loss) attributable to SEACOR Holdings Inc. (1,917) 6,405 14,553 7,733 Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.10) $ 0.33 $ 0.80 $ 0.42 Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.10) $ 0.32 $ 0.76 $ 0.41 2018 Operating Revenues $ 213,838 $ 220,257 $ 216,831 $ 184,824 Operating Income 25,250 34,047 12,014 14,688 Net Income 4,434 27,203 46,007 5,558 Net Income (Loss) attributable to SEACOR Holdings Inc. (4,686) 17,067 45,126 641 Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.26) $ 0.94 $ 2.50 $ 0.04 Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.26) $ 0.88 $ 2.14 $ 0.04

Valuation And Qualifying Accoun

Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation And Qualifying Accounts	SEACOR HOLDINGS INC. SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2019, 2018 and 2017 (in thousands) Description Balance Charges Deductions (1) Balance Year Ended December 31, 2019 Allowance for doubtful accounts (deducted from trade and notes receivable) $ 3,481 $ 2,021 $ (2,631) $ 2,871 Year Ended December 31, 2018 Allowance for doubtful accounts (deducted from trade and notes receivable) $ 2,390 $ 2,067 $ (976) $ 3,481 Year Ended December 31, 2017 Allowance for doubtful accounts (deducted from trade and notes receivable) $ 2,989 $ (175) $ (424) $ 2,390 ______________________ (1) Trade receivable amounts deemed uncollectible that were removed from accounts receivable and allowance for doubtful accounts.

Nature Of Operations And Acco_2

Nature Of Operations And Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Nature of Operations and Segmentation	Nature of Operations and Segmentation. SEACOR Holdings Inc. (“SEACOR”) and its subsidiaries (collectively referred to as the “Company”) are a diversified holding company with interests in domestic and international transportation and logistics, risk management consultancy and other businesses. Accounting standards require public business enterprises to report information about each of their operating business segments that exceed certain quantitative thresholds or meet certain other reporting requirements. Operating business segments have been defined as a component of an enterprise about which separate financial information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The Company has identified the following reporting segments: Ocean Transportation & Logistics Services (“Ocean Services”). Ocean Services owns and operates a diversified fleet of bulk transportation, port and infrastructure, and logistics assets, including U.S. coastwise eligible vessels and vessels trading internationally. Ocean Services owns and operates U.S.-flag petroleum and chemical carriers servicing the U.S. coastwise crude oil, petroleum products and chemical trades. Ocean Services’ dry bulk vessels also operate in the U.S. coastwise trade. Ocean Services’ port and infrastructure services assist deep-sea vessels docking in U.S. Gulf and East Coast ports, providing ocean towing services between U.S. ports and providing oil terminal support and bunkering operations in St. Eustatius and the Bahamas. Ocean Services’ logis tics services include U.S.-flag Pure Car/Truck Carriers (“PCTCs”) operating globally under the U.S. Maritime Security Program (“MSP”) and liner, short-sea, rail car and project cargo transportation and logistics solutions to and from ports in the Southeastern United States, the Caribbean (including Puerto Rico), the Bahamas and Mexico. Ocean Services also provides technical ship management services for third-party vessel owners. Ocean Services contributed 53%, 50% and 54% of the Company's consolidated operating revenues during the years ended December 31, 2019, 2018 and 2017, respectively. During the year ended December 31, 2019, one Ocean Services (U.S. Federal Government) customer accounted for $79.6 million, or 10%, of the Company's consolidated operating revenues. Inland Transportation & Logistics Services (“Inland Services”). Inland Services markets and operates domestic river transportation equipment, and owns fleeting and high-speed multi-modal terminal locations adjacent to and along the U.S. Inland Waterways, primarily in the St. Louis, Memphis and Baton Rouge areas. Inland Services’ barges are primarily used for moving agricultural and industrial commodities and containers on the U.S. Inland Waterways, the Mississippi River, Illinois River, Tennessee River, Ohio River and their tributaries and the Gulf Intracoastal Waterways. Internationally, Inland Services also owns inland river liquid tank barges that operate on the Magdalena River in Colombia. These barges primarily transport petroleum products. Inland Services also has a 50% interest in dry-cargo barge operations on the Parana-Paraguay Waterway in Brazil, Bolivia, Paraguay, Argentina and Uruguay primarily transporting agricultural and industrial commodities, a 63% interest in towboat operations on the U.S. Inland Waterways and a 50% interest in grain terminals/elevators along the U.S. Inland waterways. Inland Services contributed 33%, 34% and 38% of the Company's consolidated operating revenues during the years ended December 31, 2019, 2018 and 2017, respectively. Witt O’Brien’s. Witt O’Brien’s provides crisis and emergency management services for both the public and private sectors. These services strengthen clients’ resilience and assist their response to natural and man-made disasters by enhancing their ability to prepare for, respond to and recover from such disasters, while mitigating the impact of future disruptions on operations and helping communities build back stronger. Witt O’Brien’s contributed 13%, 16% and 8% of the Company's consolidated operating revenues during the years ended December 31, 2019, 2018 and 2017, respectively. Other. The Company’s Other business segment includes CLEANCOR Energy Solutions LLC (“Cleancor”), a full service provider that designs, develops and maintains alternative energy and power solutions for end users looking to displace legacy petroleum-based fuels and adopt energy supplies that have a favorable environmental footprint. Cleancor provides liquefied natural gas (“LNG”) and compressed natural gas (“CNG”) fuel supply and logistics to commercial, industrial, agricultural and transportation customers and provides natural gas during pipeline supply interruptions due to planned maintenance or other curtailments (see Note 2). Other also has activities that primarily include noncontrolling investments in various other businesses, primarily sales, storage, and maintenance support for general aviation in Asia and an agricultural commodity trading and logistics business that is primarily focused on the global origination, and trading and merchandising of sugar and other commodities.
Discontinued Operations	Discontinued Operations. The Company reports the historical financial position, results of operations and cash flows of disposed businesses as discontinued operations when it has no continuing interest in the business. On June 1, 2017, the Company completed the spin-off of SEACOR Marine Holdings Inc. (“SEACOR Marine”), the company that operated SEACOR’s Offshore Marine Services business segment, by means of a dividend of all the issued and outstanding common stock of SEACOR Marine to SEACOR’s shareholders (the “Spin-off”). SEACOR Marine is now an independent company whose common stock is listed on the New York Stock Exchange under the symbol “SMHI.” For all periods presented herein, the Company has reported the historical results of operations and cash flows of SEACOR Marine as discontinued operations (see Note 19). On July 3, 2017, the Company completed the sale of its 70% interest in Illinois Corn Processing LLC (“ICP”), the company that operated SEACOR’s Illinois Corn Processing business segment. The Company received $21.0 million in cash and a note from the buyer for $32.8 million, after working capital adjustments, resulting in a gain of $10.9 million, net of tax. On September 15, 2017, the Company received payment of the outstanding balance of the note, including accrued and unpaid interest. For all periods presented herein, the Company has reported the historical results of operations and cash flows of ICP as discontinued operations (see Note 19).
Basis of Consolidation	Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50% of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolled equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income based on such fair value. If a subsidiary is consolidated upon a change in control, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20% and 50% of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings or losses from investments in 50% or less owned companies in the accompanying consolidated statements of income as equity in earnings (losses) of 50% or less owned companies, net of tax. The Company employs the cost method of accounting for investments in 50% or less owned companies it does not control or exercise significant influence. These investments in private companies are carried at cost and are adjusted only for capital distributions and other-than-temporary declines in fair value.
Acquisition of Noncontrolling Interest	Acquisition of Noncontrolling Interest. On August 2, 2019, the Company, through certain subsidiaries, became the sole owner of the SEA-Vista joint venture by acquiring the 49% interest (the “Remaining SEA-Vista Interest”) that had been owned by ACP III Tankers, LLC (the "Seller"), an affiliate of Avista Capital Partners. As consideration for the Remaining SEA-Vista Interest, SEACOR issued 1,500,000 shares of Common Stock to the Seller (the "Consideration Shares"), in a noncash transaction, and the Company paid $107.7 million in cash, inclusive of expenses related to the transaction (see Notes 12 and 13).
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include those related to allowance for doubtful accounts, useful lives of property and equipment, impairments, income tax provisions and certain accrued liabilities. Actual results could differ from those estimates and those differences may be material.
Adoption of New Accounting Standards	Adoption of New Accounting Standards. On January 1, 2019, the Company adopted Financial Accounting Standards Board (“FASB”) Topic 842, Leases (“Topic 842”) using a modified prospective approach and implemented internal controls and systems to enable the preparation of financial information upon adoption. The Company elected the available practical expedients permitted under the guidance including the option to not separate lease and nonlease components in calculating the right-of-use assets and corresponding lease liabilities and to not apply the recognition requirements of Topic 842 to short-term leases (leases that have a duration of twelve months or less at lease inception). Generally, it was not possible for the Company to determine the interest rate implicit in each of its operating leases and therefore used its incremental borrowing rate in calculating operating lease right-of-use assets and lease liabilities. The Company assigned its leases to portfolios based on the remaining term at the time of adoption and applied a single rate to each portfolio of leases as the result was not materially different than using a specific discount rate for each individual lease. The Company included renewal options that were reasonably certain of being exercised in determining the lease term. Upon adoption, the Company recorded operating lease right-of-use assets and lease liabilities of $175.0 million for certain of its equipment, offices, real property and land leases (see Note 8). In addition, the Company recognized a cumulative-effect adjustment of $25.4 million, net of tax, to the opening balance of retained earnings primarily for previously deferred gains related to sale-leaseback transactions. On January 1, 2018, the Company adopted Financial Accounting Standard Board (“FASB”) Topic 606, Revenue from Contracts with Customers (“Topic 606”). As a consequence of adopting Topic 606, the Company now recognizes all of the operating revenues and expenses associated with the dry-cargo barge pools it manages along with additional operating expenses reflective of barge pool earnings attributable to third-party barge owners and not the Company in its capacity as manager. Under Topic 606, the Company determined it was a principal with respect to the third-party barge owners. Previously, the Company recognized operating revenues and expenses only for its proportionate share of the barge pools in which it participated, as it acted as an agent. All prior periods have been adjusted to reflect the retrospective adoption of Topic 606, which resulted in additional revenues and operating expenses of $73.0 million for the year ended December 31, 2017. The adoption of Topic 606 had no impact on previously reported balance sheets, operating income, net income or earnings (loss) per share. On January 1, 2018, the Company adopted ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory , which eliminates the deferral of the tax effects of intercompany asset sales other than inventory until the transferred assets are sold to a third party or recovered through use. As a result of the adoption of the standard, the deferred tax charges previously recognized from those sales resulted in a decrease in deferred tax assets and a cumulative adjustment to retained earnings of $2.5 million in the consolidated balance sheets and statements of changes in equity as of January 1, 2018.
Revenue Recognition	Revenue Recognition. The Company earns revenues from contracts with customers and from lease contracts. Revenue from Contracts with Customers. Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled to in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers control of the promised goods or services to its customers. Costs to obtain or fulfill a contract are expensed as incurred. Ocean Services' revenues from contracts with customers primarily arise from voyage charters, contracts of affreightment, tariff based port and infrastructure services, unit freight logistics services, and technical ship management agreements with vessel owners (see Note 18). Ocean Services transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Voyage charters are contracts to carry cargoes on a single voyage basis for a predetermined price, regardless of time to complete. Contracts of affreightment are contracts for cargoes that are committed on a multi-voyage basis for various periods of time, with minimum and maximum cargo tonnages specified over the period at a fixed or escalating rate per ton. Tariff based port and infrastructure services typically include operating harbor tugs alongside oceangoing vessels to escort them to their berth, assisting with the docking and undocking of these oceangoing vessels and escorting them back out to sea. They are contracted using prevailing port tariff terms on a per-use basis. In the unit freight logistics trade, transportation services typically include transporting shipping containers, rail cars, project cargoes, automobiles and U.S. military vehicles and are generally contracted on a per unit basis for the specified cargo and destination, typically in accordance with a publicly available tariff rate or based on a negotiated rate when moving larger volumes over an extended period. Managed services include technical ship and crew management agreements whereby Ocean Services provides technical ship and crew management services to third-party customers for a predetermined price over a specified period of time, typically a year or more. Inland Services' revenues from contracts with customers primarily arise from contracts of affreightment, terminal operations, fleeting operations and repair and maintenance services (see Note 18). Inland Services transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Contracts of affreightment are contracts whereby customers are charged an established rate per ton to transport cargo from point-to-point. Terminal operations includes tank farms and dry bulk and container handling facilities that are marketed under contractual rates and terms driven by throughput volume. Fleeting operations includes fleeting services whereby barges are held in fleeting areas for an agreed-upon day rate and shifting services whereby harbor boats are used to pick up and drop off barges to assist in assembling tows and to move barges to and from the dock for loading and unloading at predetermined per-shift fees. Other operations primarily include a machine shop specializing in towboat and barge cleaning, repair and maintenance services that are charged on an hourly or a fixed fee basis depending on the scope and nature of the work. Witt O’Brien’s revenues from contracts with customers primarily arise from time and material and retainer contracts (see Note 18). Witt O’Brien’s transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Time and material contracts primarily relate to emergency response, debris management or consulting services that Witt O’Brien’s performs for a predetermined fee. Retainer contracts, which are nearly all with vessel services operators and oil companies, are contracted based on agreed-upon rates. The Company’s Other business segment includes Cleancor, which primarily earns revenues from the sale of liquefied natural gas (see Note 18). Under these arrangements, control of the goods are transferred to the customer and performance obligations are satisfied at a point in time, and therefore revenue is recognized upon delivery while any related costs are expensed as incurred. Contract liabilities from contracts with customers arise when the Company has received consideration prior to performance and are included in other current liabilities in the accompanying consolidated balance sheets. The Company’s contract liability activity for the years ended December 31, were as follows (in thousands): 2019 2018 Balance at beginning of period $ 968 $ 983 Previously deferred revenues recognized upon completion of performance obligations during the period (968) (983) Net contract liabilities arising during the period 794 968 Balance at end of period $ 794 $ 968
Lease Revenues	Lease Revenues. The Company’s lease revenues are primarily from time charters, bareboat charters and non-vessel rental agreements that are recognized ratably over the lease term as services are provided, typically on a per day basis. Under a time charter, the Company provides a vessel to a customer for a set term and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer for a set term and the customer assumes responsibility for all operating expenses and risks of operation. Under a non-vessel rental agreement, the Company provides non-vessel property or equipment to a customer for a set term and the customer assumes responsibility for all operating expenses and risks of operation.
Cash Equivalents	Cash Equivalents. The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash equivalents consist of U.S. treasury securities, money market instruments, time deposits and overnight investments.
Restricted Cash and Restricted Cash Equivalents	Restricted Cash and Restricted Cash Equivalents. Restricted cash and restricted cash equivalents primarily relates to cash collateral for letters of credit and banking facility requirements.
Marketable Securities	Marketable Securities. Marketable equity securities and debt securities with readily determinable fair values are reported in the accompanying consolidated balance sheets as marketable securities. These investments are stated at fair value, as determined by their observable market prices, with both realized and unrealized gains and losses reported in the accompanying consolidated statements of income as marketable security gains (losses), net. Short sales of marketable securities are stated at fair value in the accompanying consolidated balance sheets with both realized and unrealized gains and losses reported in the accompanying consolidated statements of income as marketable security gains (losses), net. Long and short marketable security positions are primarily in energy, marine, transportation and other related businesses. Marketable securities are classified as trading securities for financial reporting purposes with gains and losses reported as operating activities in the accompanying consolidated statements of cash flows.
Trade Receivables, Other Receivables	Trade Receivables. Customers of Ocean Services are primarily multinational oil companies, refining companies, oil trading companies, major gasoline retailers, large industrial consumers of crude, petroleum and chemicals, trading houses, pools, major automobile manufacturers and shippers, the U.S. government and regional power utilities. Customers of Inland Services are primarily major agricultural companies, fertilizer companies, trading companies and industrial companies. Customers of Witt O’Brien’s are primarily governments, energy companies, ship managers and owners, healthcare providers, universities and school systems. Customers of the Company’s other business activities primarily include agricultural and feed companies, asphalt producers and municipalities and government agencies. All customers are granted credit on a short-term basis and related credit risks are considered minimal. The Company routinely reviews its trade receivables and makes provisions for probable doubtful accounts; however, those provisions are estimates and actual results could differ from those estimates and those differences may be material. Trade receivables are deemed uncollectible and removed from accounts receivable and the allowance for doubtful accounts when collection efforts have been exhausted. Other Receivables. Other receivables primarily consists of income tax and insurance claim receivables. Other receivables also includes amounts due from certain of the Company’s 50% or less owned companies for working capital in excess of working capital advances, which are typically settled monthly in arrears.
Derivative Instruments	Derivative Instruments. The Company accounts for derivatives through the use of a fair value concept whereby all of the Company’s derivative positions are stated at fair value in the accompanying consolidated balance sheets. Realized and unrealized gains and losses on derivatives not designated as hedges are reported in the accompanying consolidated statements of income as derivative gains. Realized and unrealized gains and losses on derivatives designated as fair value hedges are recognized as corresponding increases or decreases in the fair value of the underlying hedged item to the extent they are effective, with any ineffective portion reported in the accompanying consolidated statements of income as derivative gains. Realized and unrealized gains and losses on derivatives designated as cash flow hedges are reported as a component of other
Concentrations of Credit Risk	Concentrations of Credit Risk. The Company is exposed to concentrations of credit risk associated with its cash, cash equivalents, restricted cash and restricted cash equivalents, construction reserve funds and derivative instruments. The Company minimizes its credit risk relating to these positions by monitoring the financial condition of the financial institutions and counterparties involved and by primarily conducting business with large, well-established financial institutions and diversifying its counterparties. The Company does not currently anticipate nonperformance of its significant counterparties. The Company is also exposed to concentrations of credit risk relating to its receivables due from customers in the industries described above. The Company does not generally require collateral or other security to support its outstanding receivables. The Company minimizes its credit risk relating to receivables by performing ongoing credit evaluations and, to date, credit losses have not been material.
Inventories	Inventories. Inventories are stated at the lower of cost (using the first-in, first-out method) or market. Inventories consist primarily of fuel and fuel oil consumed by the Company’s vessels in its Ocean Services and Inland Services business segments. The Company records write-downs, as needed, to adjust the carrying amount of inventories to the lower of cost or market. During the years ended December 31, 2019, 2018 and 2017, the Company had no market write-downs of inventory.
Property and Equipment	Property and Equipment. Equipment, stated at cost, is depreciated using the straight line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is typically based upon a newly built asset being placed into service and represents the point at which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older assets that have already exceeded their useful life as set forth in the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of remaining useful life, typically the next survey or certification date. As of December 31, 2019, the estimated useful life (in years) of each of the Company’s major classes of new equipment was as follows: Petroleum and chemical carriers - U.S.-flag 25 Bulk carriers - U.S.-flag 25 Harbor and offshore tugs 25 Ocean liquid tank barges 25 Short-sea container/RORO (1) vessels 20 Inland river dry-cargo and specialty barges 20 Inland river liquid tank barges 25 Inland river towboats and harbor boats 25 Terminal and fleeting facilities 20 ______________________ (1) Roll On/Roll Off. The Company’s major classes of property and equipment as of December 31, were as follows (in thousands): Historical Cost (1) Accumulated Net Book 2019 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 649,795 $ (267,894) $ 381,901 Harbor and offshore tugs - U.S.-flag 133,419 (47,637) 85,782 Harbor tugs - Foreign-flag 45,379 (16,067) 29,312 Ocean liquid tank barges - U.S.-flag 39,238 (16,171) 23,067 Short-sea container/RORO - Foreign-flag 27,073 (11,990) 15,083 Bulk carriers - U.S.-flag 13,000 (9,800) 3,200 Other (2) 21,516 (10,994) 10,522 Construction in Progress 2,847 — 2,847 932,267 (380,553) 551,714 Inland Services: Dry-cargo barges 225,278 (118,615) 106,663 Specialty barges 3,828 (2,344) 1,484 Liquid tank barges 19,784 (3,684) 16,100 Towboats 62,207 (4,981) 57,226 Harbor boats 19,296 (9,324) 9,972 Terminal and fleeting facilities 103,455 (65,960) 37,495 Other (2) 27,536 (11,388) 16,148 Construction in Progress 7,736 — 7,736 469,120 (216,296) 252,824 Witt O’Brien’s: Other (2) 1,134 (993) 141 Other: Other (3) 8,897 (2,450) 6,447 Corporate and Eliminations: Other (2) 30,964 (23,732) 7,232 $ 1,442,382 $ (624,024) $ 818,358 ______________________ (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value. (2) Includes land and buildings, leasehold improvements, fixed-wing aircraft, vehicles and other property and equipment. (3) Includes LNG Equipment and other property and equipment. Historical Cost (1) Accumulated Net Book 2018 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 649,795 $ (241,604) $ 408,191 Harbor and offshore tugs - U.S.-flag 132,697 (41,764) 90,933 Harbor tugs - Foreign-flag 45,379 (13,822) 31,557 Ocean liquid tank barges - U.S.-flag 39,238 (14,649) 24,589 Short-sea container/RORO - Foreign-flag 29,846 (10,644) 19,202 Bulk carriers - U.S.-flag 13,000 (9,800) 3,200 Other (2) 20,073 (9,716) 10,357 Construction in Progress 202 — 202 930,230 (341,999) 588,231 Inland Services: Dry-cargo barges 222,539 (106,157) 116,382 Specialty barges 3,828 (1,904) 1,924 Liquid tank barges 20,011 (3,054) 16,957 Towboats 43,998 (3,294) 40,704 Harbor boats 18,695 (8,047) 10,648 Terminal and fleeting facilities 99,696 (62,274) 37,422 Other (2) 22,213 (10,364) 11,849 Construction in Progress 7,868 — 7,868 438,848 (195,094) 243,754 Witt O’Brien’s: Other (2) 1,227 (1,031) 196 Other: Other (3) 6,892 (490) 6,402 Corporate and Eliminations: Other (2) 30,132 (22,205) 7,927 $ 1,407,329 $ (560,819) $ 846,510 ______________________ (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value. (2) Includes land and buildings, leasehold improvements, fixed-wing aircraft, vehicles and other property and equipment. (3) Includes LNG Equipment and other property and equipment. During the years ended December 31, 2019, 2018 and 2017, depreciation expense totaled $65.0 million, $69.9 million and $72.1 million, respectively. Equipment maintenance and repair costs and the costs of routine overhauls, dry-dockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized. Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. During the years ended December 31, 2019, 2018 and 2017, capitalized interest totaled $0.1 million, $0.2 million and $2.7 million, respectively. As of December 31, 2019, the Company’s construction in progress totaling $12.5 million primarily consisted of the construction of harbor tugs, inland river towboats and other Inland Services equipment, and is included in historical cost in the accompanying consolidated balance sheets.
Intangible Assets	Intangible Assets. The Company’s intangible assets primarily arose from business acquisitions (see Note 2) and consist of trademarks and tradenames, customer relationships and acquired contractual rights. These intangible assets are amortized over their estimated useful lives generally ranging from one The Company’s intangible assets by type were as follows (in thousands): Trademark/ Customer Acquired Total Gross Carrying Value Year Ended December 31, 2017 $ 3,324 $ 15,365 $ 18,358 $ 37,047 Acquired intangible assets — 1,120 — 1,120 Fully amortized intangible assets — (1,120) — (1,120) Year Ended December 31, 2018 3,324 15,365 18,358 37,047 Acquired intangible assets — — — — Year Ended December 31, 2019 $ 3,324 $ 15,365 $ 18,358 $ 37,047 Accumulated Amortization Year Ended December 31, 2017 $ (1,980) $ (5,146) $ (1,815) $ (8,941) Amortization expense (332) (2,402) (1,941) (4,675) Fully amortized intangible assets — 1,120 — 1,120 Year Ended December 31, 2018 (2,312) (6,428) (3,756) (12,496) Amortization expense (332) (1,282) (1,941) (3,555) Year Ended December 31, 2019 $ (2,644) $ (7,710) $ (5,697) $ (16,051) Weighted average remaining contractual life, in years 2.0 7.1 7.1 6.9 Future amortization expense of intangible assets for each of the years ended December 31, is as follows (in thousands): 2020 $ 3,555 2021 3,571 2022 2,866 2023 2,852 2024 2,833 Years subsequent to 2024 5,319 $ 20,996
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations, including intangible assets, when indicators of impairment are present. These indicators may include a significant decrease in the market price of a long-lived asset or asset group, a significant adverse change in the extent or manner in which a long-lived asset or asset group is being used or in its physical condition, or a current period operating or cash flow loss combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group. If the carrying values of the assets are not recoverable, as determined by the estimated undiscounted cash flows, the estimated fair value of the assets or asset groups are compared to their current carrying values and impairment charges are recorded if the carrying value exceeds fair value. The Company performs its testing on an asset or asset group basis. Generally, fair value is determined using valuation techniques, such as expected discounted cash flows or appraisals, as appropriate. During the years ended December 31, 2019 and 2018, the Company did not recognize any impairment charges related to its property and equipment held for use. During the year ended December 31, 2017, the Company recognized impairment charges of $0.4 million related to property and equipment held for use, which are included in gains (losses) on asset dispositions and impairments, net in the accompanying consolidated statements of income.
Impairment of 50% or Less Owned Companies	Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. Generally, fair value is determined using valuation techniques, such as expected discounted cash flows or appraisals, as appropriate. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value, and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the year ended December 31, 2019, the Company did not recognize any impairment charges related to its 50% or less owned companies. During the years ended December 31, 2018 and
Goodwill	Goodwill. Goodwill is recorded when the purchase price paid for an acquisition exceeds the fair value of net identified tangible and intangible assets acquired. As of December 31, 2019, substantially all of the Company’s goodwill is related to Witt O’Brien’s. The Company performs an annual impairment test of goodwill on October 1 of each year and further periodic tests to the extent indicators of impairment develop between annual impairment tests. The Company’s impairment review process compares the fair value of the reporting unit to its carrying value, including the goodwill, related to the reporting unit. To determine the fair value of the reporting unit, the Company may use various approaches including an asset or cost approach, market approach or income approach or any combination thereof. These approaches may require the Company to make certain estimates and assumptions including projections of future cash flows, revenues and expenses. These estimates and assumptions are reviewed each time the Company tests goodwill for impairment and are typically developed as part of the Company’s routine business planning and forecasting process. Although the Company believes its assumptions and estimates are reasonable, the Company’s actual performance against its estimates could produce different results and lead to impairment charges in future periods. During the years ended December 31, 2019, 2018 and 2017, the Company did not recognize any impairment charges related to its goodwill.
Business Combinations	Business Combinations. The Company recognizes 100% of the fair value of assets acquired, liabilities assumed, and noncontrolling interests when the acquisition constitutes a change in control of the acquired entity. Shares issued in consideration for a business combination, contingent consideration arrangements and pre-acquisition loss and gain contingencies are all measured and recorded at their acquisition-date fair value. Subsequent changes to fair value of contingent consideration arrangements are generally reflected in earnings. Any in-process research and development assets acquired are capitalized as are certain acquisition-related restructuring costs if the criteria related to exit or disposal cost obligations are met as of the acquisition date. Acquisition-related transaction costs are expensed as incurred and any changes in income tax valuation allowances and tax uncertainty accruals are recorded as an adjustment to income tax expense (benefit). The operating results of entities acquired are included in the accompanying consolidated statements of income from the date of acquisition (see Note 2).
Debt Discount and Issuance Costs	Debt Discount and Issuance Costs. Debt discounts and costs incurred in connection with the issuance of debt are amortized over the life of the related debt using the effective interest rate method for term loans and straight line method for revolving credit facilities and is included in interest expense in the accompanying consolidated statements of income.
Self-insurance Liabilities	Self-insurance Liabilities. The Company maintains hull, liability and war risk, general liability, workers compensation and other insurance customary in the industries in which it operates. Certain excess and property insurance policies are obtained through SEACOR sponsored programs, with premiums charged to participating businesses based on management’s risk assessment or insured asset values. The marine hull and liability policies have significant annual aggregate deductibles that are accrued based on actual claims incurred. The Company also maintains self-insured health benefit plans for its participating employees. Exposure to the health benefit plans are limited by maintaining stop-loss and aggregate liability coverage. To the extent that estimated self-insurance losses, including the accrual of annual aggregate deductibles, differ from actual losses realized, the Company’s insurance reserves could differ significantly and may result in either higher or lower insurance expense in future periods.
Income Taxes	Income Taxes. Deferred income tax assets and liabilities have been provided in recognition of the income tax effect attributable to the book and tax basis differences of assets and liabilities reported in the accompanying consolidated financial statements. Deferred tax assets or liabilities are provided using the enacted tax rates expected to apply to taxable income in the periods in which they are expected to be settled or realized. Interest and penalties relating to uncertain tax positions are recognized in interest expense and administrative and general, respectively, in the accompanying consolidated statements of income. The Company records a valuation allowance to reduce its deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company records any liability associated with global intangible low-taxed income (GILTI) in the period it is incurred. In the normal course of business, the Company may be subject to challenges from tax authorities regarding the amount of taxes due. These challenges may alter the timing or amount of taxable income or deductions. As part of the calculation of income tax expense (benefit), the Company determines whether the benefits of its tax positions are at least more likely than not of being sustained based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained, the Company accrues the largest amount of the tax benefit that is more likely than not of being sustained. Such accruals require management to make estimates and judgments with respect to the ultimate outcome of its tax benefits and actual results could vary materially from these estimates.
Deferred Gains	Deferred Gains – Equipment Sale-Leaseback Transactions and Financed Equipment Sales. From time to time, the Company enters into equipment sale-leaseback transactions with finance companies or provides seller financing on sales of its equipment to third parties or 50% or less owned companies. A portion of the gains realized from these transactions is not immediately recognized in income and has been recorded in the accompanying consolidated balance sheets in deferred gains and other liabilities. In sale-leaseback transactions (see Note 3), gains are deferred to the extent of the present value of future minimum lease payments and are amortized as reductions to rental expense over the applicable lease terms. In financed equipment sales (see Note 3), gains are deferred to the extent that the repayment of purchase notes is dependent on the future operations of the sold equipment and are amortized based on cash received from the buyers. Deferred gain activity related to these transactions for the years ended December 31, was as follows (in thousands): 2019 2018 2017 Balance at beginning of year $ 39,102 $ 66,519 $ 74,774 Impact of adoption of accounting principle (1) (29,207) — — Deferred gains arising from equipment sales — — 13,336 Amortization of deferred gains included in operating expenses as a reduction to rental expense — (12,774) (15,035) Amortization of deferred gains included in gains on asset dispositions and impairments, net (1,127) (11,591) (602) Reclassification of deferred gains into historical cost on reacquired property and equipment — (3,052) (5,954) Balance at end of year $ 8,768 $ 39,102 $ 66,519 ______________________ (1) On January 1, 2019 the Company adopted Topic 842 and reduced deferred gains associated with sale-leaseback transactions through a beginning period retained earnings adjustment. Deferred Gains – Equipment Sales to the Company’s 50% or Less Owned Companies. A portion of the gains realized from non-financed sales of the Company’s vessels and barges to its 50% or less owned companies is not immediately recognized in income and has been recorded in the accompanying consolidated balance sheets in deferred gains and other liabilities. Effective January 1, 2009, the Company adopted new accounting rules related to the sale of its vessels and barges to its 50% or less owned companies. In most instances, these sale transactions are now considered a sale of a business in which the Company relinquishes control to its 50% or less owned companies. Subsequent to the adoption of the new accounting rules, gains are deferred only to the extent of the Company’s uncalled capital commitments and are amortized as those commitments lapse or funded amounts are returned. For transactions occurring prior to the adoption of the new accounting rules, gains were deferred and are being amortized based on the Company’s ownership interest, cash received and the applicable equipment’s useful lives. Deferred gain activity related to these transactions for the years ended December 31, was as follows (in thousands): 2019 2018 2017 Balance at beginning of year $ 4,562 $ 5,934 $ 7,649 Amortization of deferred gains included in gains on asset dispositions and impairments, net (1,322) (1,372) (1,715) Balance at end of year $ 3,240 $ 4,562 $ 5,934
Stock Based Compensation	Stock Based Compensation. Stock based compensation is amortized to compensation expense on a straight line basis over the requisite service period of the grants using the Black-Scholes valuation model. The Company does not estimate forfeitures in its expense calculations as forfeiture history has been minor. The Company presents the excess tax benefits from the exercise of stock options as a financing cash flow in the accompanying consolidated statements of cash flows.
Foreign Currency Translation and Transactions	Foreign Currency Translation. The assets, liabilities and results of operations of certain SEACOR subsidiaries are measured using their functional currency, which is the currency of the primary foreign economic environment in which they operate. Upon consolidating these subsidiaries with SEACOR, their assets and liabilities are translated to U.S. dollars at currency exchange rates as of the balance sheet dates and their revenues and expenses are translated at the weighted average currency exchange rates during the applicable reporting periods. Translation adjustments resulting from the process of translating these subsidiaries’ financial statements are reported in other comprehensive income (loss) in the accompanying consolidated statements of comprehensive income. Foreign Currency Transactions. Certain SEACOR subsidiaries enter into transactions denominated in currencies other than their functional currency. Gains and losses resulting from changes in currency exchange rates between the functional currency and the currency in which a transaction is denominated are included in foreign currency gains (losses), net in the accompanying consolidated statements of income in the period in which the currency exchange rates change.
Earnings Per Share	Earnings Per Share. Basic earnings per common share of SEACOR are computed based on the weighted average number of common shares issued and outstanding during the relevant periods. Diluted earnings per common share of SEACOR are computed based on the weighted average number of common shares issued and outstanding plus the effect of potentially dilutive securities through the application of the treasury stock and if-converted methods. Dilutive securities for this purpose assumes restricted stock grants have vested, common shares have been issued pursuant to the exercise of outstanding stock options and common shares have been issued pursuant to the conversion of all outstanding convertible notes. Computations of basic and diluted earnings per common share of SEACOR for the years ended December 31, were as follows (in thousands, except share data): Net Income Average o/s Shares Per Share 2019 Basic Weighted Average Common Shares Outstanding $ 26,774 18,949,981 $ 1.41 Effect of Dilutive Securities: Options and Restricted Stock (1) — 129,250 Convertible Securities (2)(3) 1,273 1,227,101 Diluted Weighted Average Common Shares Outstanding $ 28,047 20,306,332 $ 1.38 2018 Basic Weighted Average Common Shares Outstanding $ 58,148 18,080,778 $ 3.22 Effect of Dilutive Securities: Options and Restricted Stock (1) — 267,810 Convertible Securities (2)(3) 1,273 1,227,101 Diluted Weighted Average Common Shares Outstanding $ 59,421 19,575,689 $ 3.04 2017 Basic Weighted Average Common Shares Outstanding $ 61,643 17,368,081 $ 3.55 Effect of Dilutive Securities: Options and Restricted Stock (1) — 308,012 Convertible Securities 14,346 5,258,065 Diluted Weighted Average Common Shares Outstanding $ 75,989 22,934,158 $ 3.31 ______________________ (1) For the years ended December 31, 2019, 2018 and 2017, diluted earnings per common share of SEACOR excluded 827,222, 333,510 and 1,924,217, respectively, of certain share awards as the effect of their inclusion in the computation would be anti-dilutive. (2) For the years ended December 31, 2019 and 2018 diluted earnings per common share of SEACOR excluded 928,464 and 1,946,917 shares, respectively, issuable pursuant to the Company’s 3.0% Convertible Senior Notes (see Note 7) as the effect of their inclusion in the computation would be anti-dilutive. (3) For the years ended December 31, 2019 and 2018 diluted earnings per share of SEACOR excluded 1,553,780 and 983,351 shares, respectively, issuable pursuant to the Company’s 3.25% Convertible Senior Notes (see Note 7) as the effect of their inclusion in the computation would be anti-dilutive.
New Accounting Pronouncements	New Accounting Pronouncements. On June 16, 2016, the FASB issued an amendment to the accounting standards, which replaces the current incurred loss impairment methodology for financial assets measured at amortized cost with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information, including forecasted information, to develop credit loss estimates. The new standard is effective for interim and annual periods beginning after December 15, 2019. The Company does not expect the adoption of the new standard will have a material impact on its consolidated financial position, results of operations or cash flows. On January 26, 2017, the FASB issued an amendment to the accounting standards, which simplified wording and removed step two of the goodwill impairment test. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The FASB also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform step two of the goodwill test. The new standard is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2020, with early adoption permitted for interim or annual goodwill impairment tests on testing dates after January 1, 2017. The Company has not yet determined what impact, if any, the adoption of the new standard will have on its consolidated financial position, results of operations or cash flows. On August 29, 2018, the FASB issued an amendment to the accounting standards, which requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the term of the arrangement, if those costs would be capitalized by the customers in a software licensing arrangement. The guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company does not expect the new standard to have a material impact on its consolidated financial position, results of operations or cash flows. On December 18, 2019, the FASB issued an amendment to the accounting standards, which enhances and simplifies various aspects of the income tax accounting guidance including the elimination of certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new guidance also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The guidance will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company has not yet determined what impact, if any, the adoption of the new standard will have on its consolidated financial position, results of operations or cash flows .

Nature Of Operations And Acco_3

Nature Of Operations And Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Contract with Customer, Asset and Liability	The Company’s contract liability activity for the years ended December 31, were as follows (in thousands): 2019 2018 Balance at beginning of period $ 968 $ 983 Previously deferred revenues recognized upon completion of performance obligations during the period (968) (983) Net contract liabilities arising during the period 794 968 Balance at end of period $ 794 $ 968
Schedule of Property, Plant and Equipment	As of December 31, 2019, the estimated useful life (in years) of each of the Company’s major classes of new equipment was as follows: Petroleum and chemical carriers - U.S.-flag 25 Bulk carriers - U.S.-flag 25 Harbor and offshore tugs 25 Ocean liquid tank barges 25 Short-sea container/RORO (1) vessels 20 Inland river dry-cargo and specialty barges 20 Inland river liquid tank barges 25 Inland river towboats and harbor boats 25 Terminal and fleeting facilities 20 ______________________ (1) Roll On/Roll Off. The Company’s major classes of property and equipment as of December 31, were as follows (in thousands): Historical Cost (1) Accumulated Net Book 2019 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 649,795 $ (267,894) $ 381,901 Harbor and offshore tugs - U.S.-flag 133,419 (47,637) 85,782 Harbor tugs - Foreign-flag 45,379 (16,067) 29,312 Ocean liquid tank barges - U.S.-flag 39,238 (16,171) 23,067 Short-sea container/RORO - Foreign-flag 27,073 (11,990) 15,083 Bulk carriers - U.S.-flag 13,000 (9,800) 3,200 Other (2) 21,516 (10,994) 10,522 Construction in Progress 2,847 — 2,847 932,267 (380,553) 551,714 Inland Services: Dry-cargo barges 225,278 (118,615) 106,663 Specialty barges 3,828 (2,344) 1,484 Liquid tank barges 19,784 (3,684) 16,100 Towboats 62,207 (4,981) 57,226 Harbor boats 19,296 (9,324) 9,972 Terminal and fleeting facilities 103,455 (65,960) 37,495 Other (2) 27,536 (11,388) 16,148 Construction in Progress 7,736 — 7,736 469,120 (216,296) 252,824 Witt O’Brien’s: Other (2) 1,134 (993) 141 Other: Other (3) 8,897 (2,450) 6,447 Corporate and Eliminations: Other (2) 30,964 (23,732) 7,232 $ 1,442,382 $ (624,024) $ 818,358 ______________________ (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value. (2) Includes land and buildings, leasehold improvements, fixed-wing aircraft, vehicles and other property and equipment. (3) Includes LNG Equipment and other property and equipment. Historical Cost (1) Accumulated Net Book 2018 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 649,795 $ (241,604) $ 408,191 Harbor and offshore tugs - U.S.-flag 132,697 (41,764) 90,933 Harbor tugs - Foreign-flag 45,379 (13,822) 31,557 Ocean liquid tank barges - U.S.-flag 39,238 (14,649) 24,589 Short-sea container/RORO - Foreign-flag 29,846 (10,644) 19,202 Bulk carriers - U.S.-flag 13,000 (9,800) 3,200 Other (2) 20,073 (9,716) 10,357 Construction in Progress 202 — 202 930,230 (341,999) 588,231 Inland Services: Dry-cargo barges 222,539 (106,157) 116,382 Specialty barges 3,828 (1,904) 1,924 Liquid tank barges 20,011 (3,054) 16,957 Towboats 43,998 (3,294) 40,704 Harbor boats 18,695 (8,047) 10,648 Terminal and fleeting facilities 99,696 (62,274) 37,422 Other (2) 22,213 (10,364) 11,849 Construction in Progress 7,868 — 7,868 438,848 (195,094) 243,754 Witt O’Brien’s: Other (2) 1,227 (1,031) 196 Other: Other (3) 6,892 (490) 6,402 Corporate and Eliminations: Other (2) 30,132 (22,205) 7,927 $ 1,407,329 $ (560,819) $ 846,510 ______________________ (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value. (2) Includes land and buildings, leasehold improvements, fixed-wing aircraft, vehicles and other property and equipment. (3) Includes LNG Equipment and other property and equipment.
Schedule of Intangible Assets	The Company’s intangible assets by type were as follows (in thousands): Trademark/ Customer Acquired Total Gross Carrying Value Year Ended December 31, 2017 $ 3,324 $ 15,365 $ 18,358 $ 37,047 Acquired intangible assets — 1,120 — 1,120 Fully amortized intangible assets — (1,120) — (1,120) Year Ended December 31, 2018 3,324 15,365 18,358 37,047 Acquired intangible assets — — — — Year Ended December 31, 2019 $ 3,324 $ 15,365 $ 18,358 $ 37,047 Accumulated Amortization Year Ended December 31, 2017 $ (1,980) $ (5,146) $ (1,815) $ (8,941) Amortization expense (332) (2,402) (1,941) (4,675) Fully amortized intangible assets — 1,120 — 1,120 Year Ended December 31, 2018 (2,312) (6,428) (3,756) (12,496) Amortization expense (332) (1,282) (1,941) (3,555) Year Ended December 31, 2019 $ (2,644) $ (7,710) $ (5,697) $ (16,051) Weighted average remaining contractual life, in years 2.0 7.1 7.1 6.9
Schedule of Future Amortization Expense of Intangible Assets	Future amortization expense of intangible assets for each of the years ended December 31, is as follows (in thousands): 2020 $ 3,555 2021 3,571 2022 2,866 2023 2,852 2024 2,833 Years subsequent to 2024 5,319 $ 20,996
Schedule of Deferred Gains	Deferred gain activity related to these transactions for the years ended December 31, was as follows (in thousands): 2019 2018 2017 Balance at beginning of year $ 39,102 $ 66,519 $ 74,774 Impact of adoption of accounting principle (1) (29,207) — — Deferred gains arising from equipment sales — — 13,336 Amortization of deferred gains included in operating expenses as a reduction to rental expense — (12,774) (15,035) Amortization of deferred gains included in gains on asset dispositions and impairments, net (1,127) (11,591) (602) Reclassification of deferred gains into historical cost on reacquired property and equipment — (3,052) (5,954) Balance at end of year $ 8,768 $ 39,102 $ 66,519 ______________________ (1) On January 1, 2019 the Company adopted Topic 842 and reduced deferred gains associated with sale-leaseback transactions through a beginning period retained earnings adjustment. 2019 2018 2017 Balance at beginning of year $ 4,562 $ 5,934 $ 7,649 Amortization of deferred gains included in gains on asset dispositions and impairments, net (1,322) (1,372) (1,715) Balance at end of year $ 3,240 $ 4,562 $ 5,934
Schedule of Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss. The components of accumulated other comprehensive loss were as follows (in thousands): SEACOR Holdings Inc. Stockholders’ Equity Noncontrolling Foreign Derivative Gains Other Total Foreign Derivative Other Other Year ended December 31, 2016 $ (11,593) $ 75 $ 4 $ (11,514) $ (1,613) $ (17) $ 3 Discontinued Operations 10,031 94 — 10,125 1,460 4 2 Other comprehensive income (loss) 1,812 (260) (6) 1,546 153 13 (5) $ 1,707 Income tax (expense) benefit (795) 91 2 (702) — — — (702) Year ended December 31, 2017 (545) — — (545) — — — $ 1,005 Other comprehensive loss (391) — — (391) — — — $ (391) Income tax benefit 22 — — 22 — — — 22 Year ended December 31, 2018 (914) — — (914) — — — $ (369) Other comprehensive income (loss) (83) 67 — (16) — — — $ (16) Income tax expense (68) — — (68) — — — (68) Year ended December 31, 2019 $ (1,065) $ 67 $ — $ (998) $ — $ — $ — $ (84)
Schedule of Earnings Per Share	Computations of basic and diluted earnings per common share of SEACOR for the years ended December 31, were as follows (in thousands, except share data): Net Income Average o/s Shares Per Share 2019 Basic Weighted Average Common Shares Outstanding $ 26,774 18,949,981 $ 1.41 Effect of Dilutive Securities: Options and Restricted Stock (1) — 129,250 Convertible Securities (2)(3) 1,273 1,227,101 Diluted Weighted Average Common Shares Outstanding $ 28,047 20,306,332 $ 1.38 2018 Basic Weighted Average Common Shares Outstanding $ 58,148 18,080,778 $ 3.22 Effect of Dilutive Securities: Options and Restricted Stock (1) — 267,810 Convertible Securities (2)(3) 1,273 1,227,101 Diluted Weighted Average Common Shares Outstanding $ 59,421 19,575,689 $ 3.04 2017 Basic Weighted Average Common Shares Outstanding $ 61,643 17,368,081 $ 3.55 Effect of Dilutive Securities: Options and Restricted Stock (1) — 308,012 Convertible Securities 14,346 5,258,065 Diluted Weighted Average Common Shares Outstanding $ 75,989 22,934,158 $ 3.31 ______________________ (1) For the years ended December 31, 2019, 2018 and 2017, diluted earnings per common share of SEACOR excluded 827,222, 333,510 and 1,924,217, respectively, of certain share awards as the effect of their inclusion in the computation would be anti-dilutive. (2) For the years ended December 31, 2019 and 2018 diluted earnings per common share of SEACOR excluded 928,464 and 1,946,917 shares, respectively, issuable pursuant to the Company’s 3.0% Convertible Senior Notes (see Note 7) as the effect of their inclusion in the computation would be anti-dilutive. (3) For the years ended December 31, 2019 and 2018 diluted earnings per share of SEACOR excluded 1,553,780 and 983,351 shares, respectively, issuable pursuant to the Company’s 3.25% Convertible Senior Notes (see Note 7) as the effect of their inclusion in the computation would be anti-dilutive.

Business Acquisitions (Tables)

Business Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	Purchase Price Allocation. The allocation of the purchase price for the Company’s acquisitions for the years ended December 31, was as follows (in thousands): 2018 2017 Restricted cash and restricted cash equivalents $ — $ 13 Trade and other receivables 1,264 15,823 Other current assets 170 2,054 Investments, at Equity, and Advances to 50% or Less Owned Companies (5,123) 10,000 Property and Equipment 4,382 15,190 Intangible Assets 1,120 10,957 Other Assets (1) 7 (17,863) Accounts payable and other accrued liabilities (2) (1,609) — Other current liabilities (439) (17,214) Long-Term Debt — (28,725) Deferred Income Taxes — 3,939 Other Liabilities — (42) Noncontrolling interests in subsidiaries (82) — Purchase price (3) $ (310) $ (5,868) ______________________ (1) Net of debtor-in-possession financing converted into equity of $18.1 million, in 2017. (2) Includes $1.5 million of consideration to be paid in two installments. (3) Purchase price is net of cash acquired totaling $3.6 million and $16.4 million in 2018 and 2017, respectively.

Equipment Acquisitions And Di_2

Equipment Acquisitions And Dispositions (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Additions of Property, Plant and Equipment	Major owned equipment placed in service for the years ended December 31, were as follows: 2019 2018 2017 (1) Petroleum and chemical carriers - U.S.-flag — — 3 Harbor tugs - U.S.-flag 1 5 1 Harbor tugs - Foreign-flag — — 2 Short-sea container/RORO - Foreign-flag — 2 — Inland river liquid tank barges — — 2 Inland river towboats 2 — 3 ______________________ (1) Excludes two U.S.-flag bulk carriers acquired in the ISH acquisition (see Note 2).
Dispositions of Property, Plant and Equipment	Major equipment dispositions for the years ended December 31, were as follows: 2019 2018 2017 Petroleum and chemical carriers - U.S.-flag — 1 1 Harbor tugs - U.S.-flag — 1 — Short-sea container/RORO - Foreign-flag 1 — — Inland river dry-cargo barges — 32 50 Inland river specialty barges — 2 2 Inland river towboats — — 2

Investments, At Equity, And A_2

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Tables)	12 Months Ended
	Dec. 31, 2019
Equity Method Investment, Summarized Financial Information [Abstract]
Summarized Financial Information For The Company's Investments, At Equity	Investments, at equity, and advances to 50% or less owned companies as of December 31, were as follows (in thousands): Ownership 2019 2018 Ocean Services: Trailer Bridge (1) 55.3% $ 56,770 $ 56,364 RF Vessel Holdings 50.0% 15,878 10,826 Golfo de Mexico 50.0% 3,485 5,272 KSM 50.0% 1,916 1,478 78,049 73,940 Inland Services: SCFCo 50.0% 33,705 37,219 Bunge-SCF Grain 50.0% 15,112 14,738 SCF Bunge Marine (1) 62.5% 3,990 3,144 Other 50.0% 2,285 2,796 55,092 57,897 Witt O’Brien’s: O’Brien’s do Brazil 50.0% 1,274 472 Other: VA&E 23.8% 10,448 13,073 Avion 39.1% 10,706 10,290 Other 40.0% – 47.5% 1,539 1,214 22,693 24,577 $ 157,108 $ 156,886 ______________________ (1) The Company’s ownership percentage represents its economic interest in the 50% or less owned company. Combined Condensed Financial Information. Summarized financial information for the Company’s investments, at equity, excluding SCFCo and Trailer Bridge, as of and for the years ended December 31, was as follows (in thousands): 2019 2018 Current assets $ 228,420 $ 184,704 Noncurrent assets 101,292 77,929 Current liabilities 160,688 113,784 Noncurrent liabilities 58,413 46,503 2019 2018 2017 Operating Revenues $ 1,015,627 $ 786,717 $ 1,068,190 Costs and Expenses: Operating and administrative 1,005,757 771,324 1,035,952 Depreciation 4,968 7,216 11,810 1,010,725 778,540 1,047,762 Gains on Asset Dispositions and Impairments, Net — 38 16,115 Operating Income $ 4,902 $ 8,215 $ 36,543 Net Income $ 2,922 $ 3,967 $ 23,383 Summarized financial information for SCFCo as of and for the years ended December 31, was as follows (in thousands): 2019 2018 Current assets $ 5,878 $ 8,322 Noncurrent assets 113,638 121,001 Current liabilities 11,077 12,958 Noncurrent liabilities 59,717 56,078 2019 2018 2017 Operating Revenues $ 45,049 $ 54,486 $ 44,177 Costs and Expenses: Operating and administrative 39,375 45,911 40,106 Depreciation 10,027 17,901 17,803 49,402 63,812 57,909 Operating Loss (4,353) (9,326) (13,732) Interest expense (6,971) (6,573) (6,120) Other expense, net (241) (2,229) (961) Net Loss $ (11,565) $ (18,128) $ (20,813)

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Long-term Debt, Unclassified [Abstract]
Schedule Of Long-Term Debt Maturities	The Company’s contractual long-term debt maturities for the years ended December 31, are as follows (in thousands): 2020 (1) $ 60,630 2021 10,499 2022 10,503 2023 10,368 2024 60,244 Years subsequent to 2024 187,991 $ 340,235 ______________________ (1) Includes the aggregate principal amount outstanding of the Company's 3.0% Convertible Senior Notes with a contractual maturity date of November 15, 2028 as the holders may require the Company to repurchase the notes on November 19, 2020.
Schedule Of Company's Borrowings	The Company’s borrowings as of December 31, were as follows (in thousands): 2019 2018 3.0% Convertible Senior Notes (1) $ 50,041 $ 107,284 2.5% Convertible Senior Notes 64,455 64,455 3.25% Convertible Senior Notes (2) 117,782 117,782 SEA-Vista 2015 Credit Facility (3) — 87,977 SEA-Vista 2019 Credit Facility (4) 100,000 — Other (5) 7,957 8,561 340,235 386,059 Portion due within one year, net of unamortized discount and issue costs (58,854) (8,497) Debt discount included in long-term debt (19,990) (28,334) Debt issuance costs included in long-term debt (5,779) (3,100) $ 255,612 $ 346,128 ______________________ (1) Excludes unamortized discount and unamortized issue costs of $1.6 million and $0.2 million, respectively, as of December 31, 2019 and $7.2 million and $0.7 million, respectively, as of December 31, 2018. (2) Excludes unamortized discount and unamortized issue costs of $18.4 million and $1.6 million, respectively, as of December 31, 2019 and $21.1 million and $1.9 million, respectively, as of December 31, 2018. (3) Excludes unamortized issue costs of $0.4 million as of December 31, 2018. (4) Excludes unamortized issue costs of $2.1 million as of December 31, 2019. (5) Excludes unamortized issue costs of $0.1 million and $0.1 million as of December 31, 2019 and December 31, 2018, respectively.

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Operating Leases [Abstract]
Lessee, Operating Lease, Liability, Maturity	For operating leases as of December 31, 2019, the future minimum payments in the years ended December 31, were as follows (in thousands): 2020 $ 41,914 2021 37,711 2022 27,460 2023 15,531 2024 13,603 Years subsequent to 2024 27,066 163,285 Interest component (18,979) 144,306 Current portion of long-term operating lease liabilities (36,011) Long-term operating lease liabilities $ 108,295
Lease, Cost	The components of lease expense for the year ended December 31, were as follows (in thousands): 2019 Operating lease expense $ 42,863 Short-term lease expense (lease duration of twelve months or less at lease commencement) 22,992 Sublease income (33,428) $ 32,427
Operating Leases Other Information	Other information related to operating leases for the year ended December 31, was as follows (in thousands except weighted average data): 2019 Operating cash outflows from operating leases $ 43,096 Right-of-use assets obtained in exchange for operating lease liabilities $ 179,944 Weighted average remaining lease term, in years 5.2 Weighted average discount rate 4.9 %
Schedule of Future Minimum Lease Revenues for Operating Leases	Future minimum lease revenues from these arrangements for the years ended December 31, were as follows (in thousands): Total Minimum Lease Revenues Leased-in Obligations (1) Net Minimum Lease Income 2020 $ 160,324 $ (31,572) $ 128,752 2021 114,395 (29,683) 84,712 2022 55,990 (22,942) 33,048 2023 34,701 (11,315) 23,386 2024 27,205 (11,346) 15,859 Years subsequent to 2024 55,102 (18,662) 36,440 ____________________ (1) The total payments to be made under existing non-cancelable leases for the property and equipment subject to these future minimum lease revenues.
Major Classes of Property and Equipment Earning Lease Revenues	The major classes of owned property and equipment earning lease revenues as of December 31, were as follows (in thousands): Historical Accumulated Net Book 2019 Ocean Services: Petroleum and chemical carriers - U.S.-flag $ 544,549 $ (258,153) $ 286,396 Harbor and offshore tugs - U.S.-flag & foreign-flag 51,129 (17,363) 33,766 Ocean liquid tank barges - U.S.-flag 39,238 (16,171) 23,067 634,916 (291,687) 343,229 Inland Services: Towboats 50,615 (3,498) 47,117 $ 685,531 $ (295,185) $ 390,346

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule Of Income Before Income Tax, Domestic and Foreign	Income before income tax expense (benefit) and equity in earnings (losses) of 50% or less owned companies derived from U.S. and foreign companies for the years ended December 31, were as follows (in thousands): 2019 2018 2017 United States $ 41,398 $ 33,563 $ 28,546 Foreign 6,182 56,558 4,748 Eliminations and other 1,517 1,568 1,911 $ 49,097 $ 91,689 $ 35,205
Components Of Income Tax Expense (Benefit)	The Company files a consolidated U.S. federal tax return. The components of income tax expense (benefit) for the years ended December 31, were as follows (in thousands): 2019 2018 2017 Current: State $ 739 $ 253 $ 1,136 Federal (244) 20,776 (17,181) Foreign 1,165 2,899 333 1,660 23,928 (15,712) Deferred: State 404 (3,001) 12 Federal 7,765 (12,512) (51,489) 8,169 (15,513) (51,477) $ 9,829 $ 8,415 $ (67,189)
Components Of Effective Income Tax Rate Reconciliation	The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the years ended December 31,: 2019 2018 2017 Statutory rate 21.0 % 21.0 % 35.0 % Income subject to tonnage tax (2.3) % (1.3) % (5.9) % Dorian distribution — % — % 22.8 % Reversal of uncertain tax position — % — % (28.7) % U.S. federal income tax statutory changes — % — % (190.2) % Non-deductible expenses 1.6 % 0.2 % 0.8 % Noncontrolling interests (3.1) % (5.7) % (22.4) % Foreign earnings not subject to U.S. income tax (4.1) % (16.2) % — % Foreign taxes not creditable against U.S. income tax 1.4 % 3.2 % — % Losses of foreign subsidiaries not benefited — % — % (6.6) % Subpart F income 1.5 % 12.1 % — % State taxes 2.0 % (3.1) % 1.2 % Share award plans 0.6 % (0.3) % 2.0 % Other 1.4 % (0.7) % 1.1 % 20.0 % 9.2 % (190.9) %
Components Of Net Deferred Income Tax Liabilities	The components of the net deferred income tax liabilities for the years ended December 31, were as follows (in thousands): 2019 2018 Deferred tax liabilities: Property and equipment $ 121,840 $ 93,049 Long-term debt 15,395 18,355 Gains on marketable securities 459 — Investments in 50% or less owned companies 1,541 1,934 Intangible assets 706 614 Deductible goodwill 1,002 344 Other — 31 Total deferred tax liabilities 140,943 114,327 Deferred tax assets: Net operating loss carryforwards 21,385 — Capital loss carryforwards 5,192 — Share award plans 3,686 3,711 Losses on marketable securities — 8,596 Debt and equity issuance costs 515 379 Other 8,721 11,178 Total deferred tax assets 39,499 23,864 Valuation allowance (4,217) (3,957) Net deferred tax assets 35,282 19,907 Net deferred tax liabilities $ 105,661 $ 94,420

Derivative Instruments And He_2

Derivative Instruments And Hedging Strategies (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Recognized Gains (Losses) On Derivative Instruments Not Designated As Hedging Instruments	The Company recognized gains on derivative instruments not designated as hedging instruments for the years ended December 31, as follows (in thousands): Derivative gains 2017 Exchange option liability on subsidiary convertible senior notes $ 19,436 Forward currency exchange, option and future contracts 291 $ 19,727

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The Company’s financial assets and liabilities as of December 31, that are measured at fair value on a recurring basis were as follows (in thousands): Level 1 Level 2 Level 3 2019 ASSETS Cash, cash equivalents, restricted cash and restricted cash equivalents $ 78,444 $ — $ — Marketable securities (1) 7,936 — — 2018 ASSETS Cash, cash equivalents, restricted cash and restricted cash equivalents $ 147,212 $ — $ — Marketable securities (1) 30,316 — — Construction reserve funds 3,908 — — ______________________ (1) Marketable security gains (losses), net include gains of $2.2 million for the year ended December 31, 2019 related to marketable security positions held by the Company as of December 31, 2019. Marketable security gains (losses), net include losses of $12.4 million and gains of $0.1 million for the years ended December 31, 2018 and 2017, respectively, related to marketable security positions held by the Company as of December 31, 2018.
Estimated Fair Value of Other Financial Assets and Liabilities	The estimated fair value of the Company’s other financial assets and liabilities as of December 31, were as follows (in thousands): Carrying Level 1 Level 2 Level 3 2019 ASSETS Notes receivable from third parties (included in other receivables and other assets) $ 1,119 $ — $ 1,082 $ — Investments, at cost, in 50% or less owned companies (included in other assets) 4,201 see below LIABILITIES Long-term debt, including current portion (1) 314,466 — 330,088 — 2018 ASSETS Notes receivable from third parties (included in other receivables and other assets) $ 2,182 $ — $ 2,159 $ — Investments, at cost, in 50% or less owned companies (included in other assets) 4,300 see below LIABILITIES Long-term debt, including current portion (1) 354,625 — 353,929 — ______________________ (1) The estimated fair value includes the embedded conversion options on the Company’s 3.0% and 3.25% Convertible Senior Notes.
Non-Financial Assets and Liabilities Measured at Fair Value	The Company’s non-financial assets that were measured at fair value during the years ended December 31, were as follows (in thousands): Level 1 Level 2 Level 3 2018 ASSETS Investments, at equity, and advances in 50% or less owned companies $ — $ 3,219 $ —

Noncontrolling Interests in S_2

Noncontrolling Interests in Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2019
Noncontrolling Interest [Abstract]
Noncontrolling Interest	Noncontrolling interests in the Company’s consolidated subsidiaries as of December 31, were as follows (in thousands): Noncontrolling Interests 2019 2018 Ocean Services: SEA-Vista 49.0% $ — $ 148,665 Inland Services: Other 3.0 % – 51.8% 785 862 Other 5.0% 3 161 $ 788 $ 149,688

Savings, Multi-Employer And D_2

Savings, Multi-Employer And Defined Benefit Pension Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Deferred Compensation Arrangements [Abstract]
Schedule of Defined Benefit Plans Disclosures	The funded status of the ISH Retirement Plan as of December 31, was as follows (in thousands): 2019 2018 Fair Value of Assets $ 37,723 $ 34,923 Projected Benefit Obligation (37,583) (34,299) Funded Status (1) $ 140 $ 624 _____________________ (1) Included in other assets in the accompanying consolidated balance sheets.
Schedule of Assumptions Used	The significant assumptions used in determining the projected benefit obligation as of December 31, and pension expense for the years ended December 31, were as follows: 2019 2018 Discount rate 3.10 % 4.05 % Rate of increase in compensations levels (1) N/A N/A CPI 2.25 % 2.25 % Cash balance interest credits (compounded annually) 4.00 % 4.00 % Expected long-term rate of return on plan assets 6.00 % 6.75 % _____________________ (1) Retirement benefits were frozen as of August 31, 2017.
Schedule of Expected Benefit Payments	The future benefit payments expected to be paid in each of the next five fiscal years are as follows (in thousands): 2020 2,250 2021 2,120 2022 2,200 2023 2,180 2024 2,160

Share Based Compensation (Table

Share Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share Based Compensation Plans	Share Award Transactions. The following transactions have occurred in connection with the Company’s share based compensation plans during the years ended December 31,: 2019 2018 2017 Restricted stock awards granted 149,950 121,850 153,100 Restricted stock awards forfeited (4,230) — (2,444) Director stock awards granted 2,125 2,875 1,750 Stock Option Activities: Outstanding as of the beginning of year 1,467,391 1,546,014 1,639,865 Granted (1) 165,650 142,550 1,013,893 Exercised (165,893) (220,694) (562,587) Forfeited (5,200) — (3,374) Expired (7,874) (479) (541,783) Outstanding as of the end of year 1,454,074 1,467,391 1,546,014 Employee Stock Purchase Plans shares issued 44,383 45,251 36,552 Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year (2) 539,414 884,218 896,265 ______________________ (1) On June 2, 2017, the Company granted 846,353 stock options to existing option holders under make-whole provisions upon the Spin-off. (2) Shares available for future grants and ESPP purchases were adjusted on June 2, 2017 to reflect the Spin-off in accordance with make-whole provisions of the plans.
Schedule of Share-based Compensation, Restricted Stock Activity	During the year ended December 31, 2019, the number of shares and the weighted average grant price of restricted stock transactions were as follows: Restricted Stock Number of Weighted Nonvested as of December 31, 2018 121,850 $ 46.66 Granted 149,950 $ 43.20 Vested (26,390) $ 46.58 Forfeited (4,230) $ 44.66 Nonvested as of December 31, 2019 241,180 $ 44.55
Schedule of Share-based Compensation, Stock Options Activity	During the year ended December 31, 2019, the number of shares and the weighted average exercise price on stock option transactions were as follows: Total Options Number of Weighted Outstanding, as of December 31, 2018 1,467,391 $ 41.72 Granted 165,650 $ 43.77 Exercised (165,893) $ 31.61 Forfeited (5,200) $ 43.47 Expired (7,874) $ 48.84 Outstanding, as of December 31, 2019 1,454,074 $ 43.19 Outstanding and Exercisable, as of December 31, 2019 1,013,705 $ 43.60

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Unrecorded Unconditional Purchase Obligations Disclosure	The Company's capital commitments as of December 31, 2019 by year of expected payment were as follows (in thousands): 2020 2021 2022 Total Ocean Services $ 22,394 $ 30,965 $ 2,636 $ 55,995 Inland Services 5,663 — — 5,663 Other 582 — — 582 $ 28,639 $ 30,965 $ 2,636 $ 62,240

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by segment	The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments. Ocean Inland Witt Other Corporate Total For the year ended December 31, 2019 Operating Revenues: External customers 423,288 267,334 101,663 7,681 — 799,966 Intersegment — — 120 — (120) — 423,288 267,334 101,783 7,681 (120) 799,966 Costs and Expenses: Operating 280,809 229,418 68,052 5,464 (110) 583,633 Administrative and general 40,215 13,140 25,959 3,489 22,714 105,517 Depreciation and amortization 40,986 23,262 835 1,982 1,506 68,571 362,010 265,820 94,846 10,935 24,110 757,721 Gains (Losses) on Asset Dispositions, Net 1,291 1,602 18 32 (33) 2,910 Operating Income (Loss) 62,569 3,116 6,955 (3,222) (24,263) 45,155 Other Income (Expense): Foreign currency losses, net (98) (212) (1) — (1) (312) Other, net (112) — (463) 431 10 (134) Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax (669) (6,520) 902 1,037 — (5,250) Segment Profit (Loss) 61,690 (3,616) 7,393 (1,754) Other Income (Expense) not included in Segment Profit 4,388 Plus Equity in Losses included in Segment Profit 5,250 Income Before Taxes and Equity in Losses 49,097 Capital Expenditures 4,859 30,040 47 1,997 843 37,786 As of December 31, 2019 Property and Equipment: Historical cost 932,267 469,120 1,134 8,897 30,964 1,442,382 Accumulated depreciation (380,553) (216,296) (993) (2,450) (23,732) (624,024) Net property and equipment 551,714 252,824 141 6,447 7,232 818,358 Operating Lease Right-of-Use Assets 109,460 31,338 3,045 — 696 144,539 Investments, at Equity, and Advances to 50% or Less Owned Companies 78,049 55,092 1,274 22,693 — 157,108 Inventories 2,233 2,510 266 246 — 5,255 Goodwill 1,852 2,343 28,506 — — 32,701 Intangible Assets 7,637 7,497 5,862 — — 20,996 Other current and long-term assets, excluding cash and near cash assets (1) 54,842 71,043 108,373 4,760 8,617 247,635 Segment Assets 805,787 422,647 147,467 34,146 Cash and near cash assets (1) 86,380 Total Assets 1,512,972 ______________________ (1) Cash and near cash assets includes cash, cash equivalents, restricted cash, restricted cash equivalents and marketable securities Ocean Inland Witt Other Corporate Total For the year ended December 31, 2018 Operating Revenues: External customers 414,844 285,688 131,629 3,589 — 835,750 Intersegment — — 80 — (80) — 414,844 285,688 131,709 3,589 (80) 835,750 Costs and Expenses: Operating 269,294 237,010 83,203 2,455 (114) 591,848 Administrative and general 40,179 13,139 24,772 1,841 22,976 102,907 Depreciation and amortization 46,270 24,164 1,944 501 1,700 74,579 355,743 274,313 109,919 4,797 24,562 769,334 Gains on Asset Dispositions 12,887 6,659 — 37 — 19,583 Operating Income (Loss) 71,988 18,034 21,790 (1,171) (24,642) 85,999 Other Income (Expense): Foreign currency losses, net (168) (2,002) (28) (3) (63) (2,264) Other, net 570 51 — 54,249 94 54,964 Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax 3,632 (5,686) 203 1,779 — (72) Segment Profit 76,022 10,397 21,965 54,854 Other Income (Expense) not included in Segment Profit (47,010) Plus Equity in Losses included in Segment Profit 72 Income Before Taxes and Equity in Losses 91,689 Capital Expenditures 39,207 8,298 — 2,639 128 50,272 As of December 31, 2018 Property and Equipment: Historical cost 930,230 438,848 1,227 6,892 30,132 1,407,329 Accumulated depreciation (341,999) (195,094) (1,031) (490) (22,205) (560,819) Net property and equipment 588,231 243,754 196 6,402 7,927 846,510 Investments, at Equity, and Advances to 50% or Less Owned Companies 73,939 57,899 471 24,577 — 156,886 Inventories 2,196 1,997 179 158 — 4,530 Goodwill 1,852 2,350 28,506 — — 32,708 Intangible Assets 8,965 8,991 6,595 — — 24,551 Other current and long-term assets, excluding cash and near cash assets (1) 48,770 78,903 81,410 2,142 13,178 224,403 Segment Assets 723,953 393,894 117,357 33,279 Cash and near cash assets (1) 181,436 Total Assets 1,471,024 ______________________ (1) Cash and near cash assets includes cash, cash equivalents, restricted cash, restricted cash equivalents, marketable securities and construction reserve funds. Ocean Inland Witt Other Corporate Total As Adjusted As Adjusted For the year ended December 31, 2017 Operating Revenues: External customers 352,876 248,452 49,055 464 — 650,847 Intersegment — — 101 — (101) — 352,876 248,452 49,156 464 (101) 650,847 Costs and Expenses: Operating 195,285 206,836 32,017 — (301) 433,837 Administrative and general 36,548 16,558 13,438 831 35,731 103,106 Depreciation and amortization 46,073 25,852 819 — 2,314 75,058 277,906 249,246 46,274 831 37,744 612,001 Gains (Losses) on Asset Dispositions and Impairments, Net (323) 11,960 — — — 11,637 Operating Income (Loss) 74,647 11,166 2,882 (367) (37,845) 50,483 Other Income (Expense): Derivative gains, net — — — — 19,727 19,727 Foreign currency gains (losses), net (130) 272 50 6 125 323 Other, net 327 — — (301) 230 256 Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax 7,664 (5,191) 174 305 — 2,952 Segment Profit (Loss) 82,508 6,247 3,106 (357) Other Income (Expense) not included in Segment Profit (35,584) Less Equity in Earnings included in Segment Profit (2,952) Income Before Taxes and Equity in Earnings 35,205 Capital Expenditures 80,006 34,322 60 — 207 114,595 As of December 31, 2017 Property and Equipment: Historical cost 901,076 448,035 1,227 — 30,131 1,380,469 Accumulated depreciation (299,528) (181,573) (938) — (20,505) (502,544) Net property and equipment 601,548 266,462 289 — 9,626 877,925 Investments, at Equity, and Advances to 50% or Less Owned Companies 52,003 66,479 777 54,182 — 173,441 Inventories 2,352 1,934 91 — — 4,377 Goodwill 1,852 2,403 28,506 — — 32,761 Intangible Assets 10,293 10,486 7,327 — — 28,106 Other current and long-term assets, excluding cash and near cash assets (1) 49,498 71,500 28,398 1,391 9,611 160,398 Segment Assets 717,546 419,264 65,388 55,573 Cash and near cash assets (1) 336,328 Total Assets 1,613,336 ______________________ (1) Cash and near cash assets includes cash, cash equivalents, restricted cash, restricted cash equivalents, marketable securities and construction reserve funds.
Disaggregation of Revenue	Ocean Inland Witt Other Corporate Total For the year ended December 31, 2019 Revenues from Contracts with Customers: Voyage charters 46,381 — — — — 46,381 Contracts of affreightment 24,540 202,317 — — — 226,857 Tariff 79,757 — — — — 79,757 Unit freight 63,420 — — — — 63,420 Terminal operations — 16,562 — — — 16,562 Fleeting operations — 17,264 — — — 17,264 Logistics services — 15,155 — — — 15,155 Time and material contracts — — 87,167 — — 87,167 Retainer contracts — — 9,874 — — 9,874 Product sales (1) — — — 5,555 — 5,555 Other 3,844 5,134 4,742 1,144 (120) 14,744 Lease Revenues: Time charter, bareboat charter and rental income 205,346 10,902 — 982 — 217,230 423,288 267,334 101,783 7,681 (120) 799,966 ______________________ (1) Costs of goods sold related to product sales was $4.5 million. Ocean Inland Witt Other Corporate Total For the year ended December 31, 2018 Revenues from Contracts with Customers: Voyage charters 73,979 — — — — 73,979 Contracts of affreightment 11,872 219,375 — — — 231,247 Tariff 74,157 — — — — 74,157 Unit freight 58,326 — — — — 58,326 Terminal operations — 21,501 — — — 21,501 Fleeting operations — 17,888 — — — 17,888 Logistics services — 14,309 — — — 14,309 Time and material contracts — — 119,196 — — 119,196 Retainer contracts — — 10,124 — — 10,124 Product sales (1) — — — 2,686 — 2,686 Other 3,268 5,223 2,389 425 (80) 11,225 Lease Revenues: Time charter, bareboat charter and rental income 193,242 7,392 — 478 — 201,112 414,844 285,688 131,709 3,589 (80) 835,750 ______________________ Ocean Inland Witt Other Corporate Total As Adjusted As Adjusted For the year ended December 31, 2017 Revenues from Contracts with Customers: Voyage charters 33,623 — — — — 33,623 Contracts of affreightment 15,181 189,080 — — — 204,261 Tariff 68,266 — — — — 68,266 Unit freight 50,693 — — — — 50,693 Terminal operations — 21,488 — — — 21,488 Fleeting operations — 15,561 — — — 15,561 Logistics services — 8,868 — — — 8,868 Time and material contracts — — 33,352 — — 33,352 Retainer contracts — — 10,192 — — 10,192 Other 1,879 5,163 5,612 464 (101) 13,017 Lease Revenues: Time charter, bareboat charter and rental income 183,234 8,292 — — — 191,526 352,876 248,452 49,156 464 (101) 650,847

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	Summarized selected operating results of the Company’s discontinued operations for the years ended December 31, were as follows (in thousands): 2017 SEACOR Marine Operating Revenues $ 62,291 Costs and Expenses: Operating 65,888 Administrative and general 29,682 Depreciation and amortization 22,181 117,751 Gains on Asset Dispositions, Net 4,219 Operating Loss (51,241) Other Income, Net 1,780 Income Tax Benefit (12,931) Equity in Earnings of 50% or Less Owned Companies, Net of Tax 1,663 Net Loss $ (34,867) Net Loss Attributable to Noncontrolling Interests $ (1,892) ICP Operating Revenues $ 78,061 Costs and Expenses: Operating 76,306 Administrative and general 2,140 Depreciation and amortization 2,354 80,800 Operating Loss (2,739) Other Income, Net (including gain on sale of business) 20,557 Income Tax Expense 7,818 Net Income $ 10,000 Net Loss Attributable to Noncontrolling Interests $ (539) Eliminations Operating Revenues $ (1,176) Costs and Expenses: Operating (1,289) Administrative and general (42) (1,331) Operating Income 155 Other Income, Net 1,738 Income Tax Expense 663 Net Income $ 1,230 Loss from Discontinued Operations, Net of Tax $ (23,637)

Quarterly Financial Informati_2

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Data [Abstract]
Quarterly Financial Information	Three Months Ended Dec. 31, Sept. 30, June 30, March 31, 2019 Operating Revenues $ 192,761 $ 200,658 $ 197,023 $ 209,524 Operating Income 2,562 12,519 11,106 18,968 Net Income (Loss) (1,912) 5,861 17,001 13,068 Net Income (Loss) attributable to SEACOR Holdings Inc. (1,917) 6,405 14,553 7,733 Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.10) $ 0.33 $ 0.80 $ 0.42 Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.10) $ 0.32 $ 0.76 $ 0.41 2018 Operating Revenues $ 213,838 $ 220,257 $ 216,831 $ 184,824 Operating Income 25,250 34,047 12,014 14,688 Net Income 4,434 27,203 46,007 5,558 Net Income (Loss) attributable to SEACOR Holdings Inc. (4,686) 17,067 45,126 641 Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.26) $ 0.94 $ 2.50 $ 0.04 Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. $ (0.26) $ 0.88 $ 2.14 $ 0.04

Nature Of Operations And Acco_4

Nature Of Operations And Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	Aug. 02, 2019	Jul. 03, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018
Nature of Operations and Accounting Policies [Line Items]
Operating revenues			$ 192,761	$ 200,658	$ 197,023	$ 209,524	$ 213,838	$ 220,257	$ 216,831	$ 184,824	$ 799,966	$ 835,750	$ 650,847
(Increase) decrease in receivables											30,385	63,764	(2,195)
Payments to noncontrolling interests											107,692	29	0
Cumulative effect of new accounting principle														$ 25,359	$ (2,467)
Depreciation											65,000	69,900	72,100
Capitalized interest											100	200	2,700
Construction in progress, gross			$ 12,500								12,500
Amortization expense											$ 3,555	4,675	2,900
Impairment of long-lived assets held-for-use													400
Equity method investment, other than temporary impairment												$ 100	900
Minimum
Nature of Operations and Accounting Policies [Line Items]
Finite-lived intangible asset, useful life											1 year
Maximum
Nature of Operations and Accounting Policies [Line Items]
Finite-lived intangible asset, useful life											15 years
Accounting Standards Update 2016-02
Nature of Operations and Accounting Policies [Line Items]
Cumulative effect of new accounting principle														175,000
Accounting Standards Update 2016-02 | Retained Earnings
Nature of Operations and Accounting Policies [Line Items]
Cumulative effect of new accounting principle														15,523
Accounting Standards Update 2016-02 | Retained Earnings | Sale Leaseback
Nature of Operations and Accounting Policies [Line Items]
Cumulative effect of new accounting principle														$ 25,400
Accounting Standards Update 2014-09
Nature of Operations and Accounting Policies [Line Items]
Effect of adoption of new accounting pronouncement													$ 73,000
Accounting Standards Update 2016-16 | Retained Earnings
Nature of Operations and Accounting Policies [Line Items]
Cumulative effect of new accounting principle															$ (2,467)
SEA-Vista
Nature of Operations and Accounting Policies [Line Items]
Stock issued during period, shares, acquisitions	1,500,000
Payments to noncontrolling interests	$ 107,700
Illinois Corn Processing LLC | Discontinued Operations, Disposed of by Sale
Nature of Operations and Accounting Policies [Line Items]
Proceeds from divestiture of businesses		$ 21,000
(Increase) decrease in receivables		32,800
Gain (loss) on disposal of discontinued operation		$ 10,900
Dry-Cargo Barge Operations
Nature of Operations and Accounting Policies [Line Items]
Noncontrolling interest, ownership percentage by parent			50.00%								50.00%
Inland River Towboat Operations
Nature of Operations and Accounting Policies [Line Items]
Noncontrolling interest, ownership percentage by parent			63.00%								63.00%
Inland Grain Terminals/Elevators
Nature of Operations and Accounting Policies [Line Items]
Noncontrolling interest, ownership percentage by parent			50.00%								50.00%
Illinois Corn Processing LLC
Nature of Operations and Accounting Policies [Line Items]
Noncontrolling interest, ownership percentage by parent		70.00%
SEA-Vista | SEA-Vista
Nature of Operations and Accounting Policies [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	49.00%
U.S. Federal Government
Nature of Operations and Accounting Policies [Line Items]
Operating revenues											$ 79,600
U.S. Federal Government | Customer Concentration Risk
Nature of Operations and Accounting Policies [Line Items]
Percentage of operating revenues											10.00%
Ocean Services
Nature of Operations and Accounting Policies [Line Items]
Percentage of operating revenues											53.00%	50.00%	54.00%
Operating revenues											$ 423,288	$ 414,844	$ 352,876
Ocean Services | SEA-Vista
Nature of Operations and Accounting Policies [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners			49.00%								49.00%
Inland Services
Nature of Operations and Accounting Policies [Line Items]
Percentage of operating revenues											33.00%	34.00%	38.00%
Operating revenues											$ 267,334	$ 285,688	$ 248,452
Witt O'Brien's LLC
Nature of Operations and Accounting Policies [Line Items]
Percentage of operating revenues											13.00%	16.00%	8.00%
Operating revenues											$ 101,663	$ 131,629	$ 49,055

Nature of Operations And Acco_5

Nature of Operations And Accounting Policies (Summary of Contract Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change in Contract with Customer, Liability [Roll Forward]
Balance at beginning of period	$ 968	$ 983
Previously deferred revenues recognized upon completion of performance obligations during the period	(968)	(983)
Net contract liabilities arising during the period	794	968
Balance at end of period	$ 794	$ 968

Nature Of Operations And Acco_6

Nature Of Operations And Accounting Policies (Estimated Useful life Of Major Assets) (Details)	12 Months Ended
	Dec. 31, 2019
Petroleum and chemical carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Bulk carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Harbor and offshore tugs
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Ocean liquid tank barges
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Short-sea container/RORO vessels
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Inland river dry-cargo and specialty barges
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Inland river liquid tank barges
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Inland river towboats and harbor boats
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	25 years
Terminal and fleeting facilities
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years

Nature Of Operations And Acco_7

Nature Of Operations And Accounting Policies (Schedule Of Property And Equipment By Major Classes) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Historical cost	$ 1,442,382	$ 1,407,329	$ 1,380,469
Accumulated depreciation	(624,024)	(560,819)	(502,544)
Net property and equipment	818,358	846,510	877,925
Operating Segments | Ocean Services
Property, Plant and Equipment [Line Items]
Historical cost	932,267	930,230	901,076
Accumulated depreciation	(380,553)	(341,999)	(299,528)
Net property and equipment	551,714	588,231	601,548
Operating Segments | Ocean Services | Petroleum and chemical carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Historical cost	649,795	649,795
Accumulated depreciation	(267,894)	(241,604)
Net property and equipment	381,901	408,191
Operating Segments | Ocean Services | Harbor and offshore tugs - U.S.-flag
Property, Plant and Equipment [Line Items]
Historical cost	133,419	132,697
Accumulated depreciation	(47,637)	(41,764)
Net property and equipment	85,782	90,933
Operating Segments | Ocean Services | Harbor tugs - Foreign-flag
Property, Plant and Equipment [Line Items]
Historical cost	45,379	45,379
Accumulated depreciation	(16,067)	(13,822)
Net property and equipment	29,312	31,557
Operating Segments | Ocean Services | Ocean liquid tank barges - U.S.-flag
Property, Plant and Equipment [Line Items]
Historical cost	39,238	39,238
Accumulated depreciation	(16,171)	(14,649)
Net property and equipment	23,067	24,589
Operating Segments | Ocean Services | Short-sea container/RORO vessels - Foreign-flag
Property, Plant and Equipment [Line Items]
Historical cost	27,073	29,846
Accumulated depreciation	(11,990)	(10,644)
Net property and equipment	15,083	19,202
Operating Segments | Ocean Services | Bulk carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Historical cost	13,000	13,000
Accumulated depreciation	(9,800)	(9,800)
Net property and equipment	3,200	3,200
Operating Segments | Ocean Services | Other
Property, Plant and Equipment [Line Items]
Historical cost	21,516	20,073
Accumulated depreciation	(10,994)	(9,716)
Net property and equipment	10,522	10,357
Operating Segments | Ocean Services | Construction in progress
Property, Plant and Equipment [Line Items]
Historical cost	2,847	202
Operating Segments | Inland Services
Property, Plant and Equipment [Line Items]
Historical cost	469,120	438,848	448,035
Accumulated depreciation	(216,296)	(195,094)	(181,573)
Net property and equipment	252,824	243,754	266,462
Operating Segments | Inland Services | Other
Property, Plant and Equipment [Line Items]
Historical cost	27,536	22,213
Accumulated depreciation	(11,388)	(10,364)
Net property and equipment	16,148	11,849
Operating Segments | Inland Services | Construction in progress
Property, Plant and Equipment [Line Items]
Historical cost	7,736	7,868
Operating Segments | Inland Services | Inland river dry-cargo barges
Property, Plant and Equipment [Line Items]
Historical cost	225,278	222,539
Accumulated depreciation	(118,615)	(106,157)
Net property and equipment	106,663	116,382
Operating Segments | Inland Services | Inland river specialty barges
Property, Plant and Equipment [Line Items]
Historical cost	3,828	3,828
Accumulated depreciation	(2,344)	(1,904)
Net property and equipment	1,484	1,924
Operating Segments | Inland Services | Inland river liquid tank barges
Property, Plant and Equipment [Line Items]
Historical cost	19,784	20,011
Accumulated depreciation	(3,684)	(3,054)
Net property and equipment	16,100	16,957
Operating Segments | Inland Services | Inland river towboats
Property, Plant and Equipment [Line Items]
Historical cost	62,207	43,998
Accumulated depreciation	(4,981)	(3,294)
Net property and equipment	57,226	40,704
Operating Segments | Inland Services | Inland river harbor boats
Property, Plant and Equipment [Line Items]
Historical cost	19,296	18,695
Accumulated depreciation	(9,324)	(8,047)
Net property and equipment	9,972	10,648
Operating Segments | Inland Services | Terminal and fleeting facilities
Property, Plant and Equipment [Line Items]
Historical cost	103,455	99,696
Accumulated depreciation	(65,960)	(62,274)
Net property and equipment	37,495	37,422
Operating Segments | Witt O'Brien's LLC
Property, Plant and Equipment [Line Items]
Historical cost	1,134	1,227	1,227
Accumulated depreciation	(993)	(1,031)	(938)
Net property and equipment	141	196	289
Operating Segments | Witt O'Brien's LLC | Other
Property, Plant and Equipment [Line Items]
Historical cost	1,134	1,227
Accumulated depreciation	(993)	(1,031)
Net property and equipment	141	196
Operating Segments | Other
Property, Plant and Equipment [Line Items]
Historical cost	8,897	6,892	0
Accumulated depreciation	(2,450)	(490)	0
Net property and equipment	6,447	6,402	0
Operating Segments | Other | Other
Property, Plant and Equipment [Line Items]
Historical cost	8,897	6,892
Accumulated depreciation	(2,450)	(490)
Net property and equipment	6,447	6,402
Corporate And Eliminations
Property, Plant and Equipment [Line Items]
Historical cost	30,964	30,132	30,131
Accumulated depreciation	(23,732)	(22,205)	(20,505)
Net property and equipment	7,232	7,927	$ 9,626
Corporate And Eliminations | Other
Property, Plant and Equipment [Line Items]
Historical cost	30,964	30,132
Accumulated depreciation	(23,732)	(22,205)
Net property and equipment	$ 7,232	$ 7,927

Nature Of Operations And Acco_8

Nature Of Operations And Accounting Policies (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, beginning balance	$ 37,047	$ 37,047
Acquired intangible assets	0	1,120
Fully amortized intangible assets		(1,120)
Intangible assets, ending balance	37,047	37,047	$ 37,047
Changes in Accumulated Amortization [Roll Forward]
Accumulated amortization, beginning balance	(12,496)	(8,941)
Amortization expense	(3,555)	(4,675)	(2,900)
Fully amortized intangible assets		1,120
Accumulated amortization, ending balance	$ (16,051)	(12,496)	(8,941)
Weighted average remaining contractual life, in years	6 years 10 months 24 days
Trademark/ Tradenames
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, beginning balance	$ 3,324	3,324
Acquired intangible assets	0	0
Fully amortized intangible assets		0
Intangible assets, ending balance	3,324	3,324	3,324
Changes in Accumulated Amortization [Roll Forward]
Accumulated amortization, beginning balance	(2,312)	(1,980)
Amortization expense	(332)	(332)
Fully amortized intangible assets		0
Accumulated amortization, ending balance	$ (2,644)	(2,312)	(1,980)
Weighted average remaining contractual life, in years	2 years
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, beginning balance	$ 15,365	15,365
Acquired intangible assets	0	1,120
Fully amortized intangible assets		(1,120)
Intangible assets, ending balance	15,365	15,365	15,365
Changes in Accumulated Amortization [Roll Forward]
Accumulated amortization, beginning balance	(6,428)	(5,146)
Amortization expense	(1,282)	(2,402)
Fully amortized intangible assets		1,120
Accumulated amortization, ending balance	$ (7,710)	(6,428)	(5,146)
Weighted average remaining contractual life, in years	7 years 1 month 6 days
Acquired Contractual Rights
Finite-lived Intangible Assets [Roll Forward]
Intangible assets, beginning balance	$ 18,358	18,358
Acquired intangible assets	0	0
Fully amortized intangible assets		0
Intangible assets, ending balance	18,358	18,358	18,358
Changes in Accumulated Amortization [Roll Forward]
Accumulated amortization, beginning balance	(3,756)	(1,815)
Amortization expense	(1,941)	(1,941)
Fully amortized intangible assets		0
Accumulated amortization, ending balance	$ (5,697)	$ (3,756)	$ (1,815)
Weighted average remaining contractual life, in years	7 years 1 month 6 days

Nature Of Operations And Acco_9

Nature Of Operations And Accounting Policies (Schedule Of Future Amortization Expense Of Intangible Assets) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2020	$ 3,555
2021	3,571
2022	2,866
2023	2,852
2024	2,833
Years subsequent to 2024	5,319
Total	$ 20,996

Nature Of Operations And Acc_10

Nature Of Operations And Accounting Policies (Schedule Of Deferred Gain Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Amortization of deferred gains on sale leaseback transactions	$ 0	$ (12,774)	$ (15,035)
Operating Expense
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Amortization of deferred gains on sale leaseback transactions	0	(12,774)	(15,035)
Gains on Asset Dispositions and Impairments, Net
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Amortization of deferred gains on sale of property, financed equipment sales	(1,127)	(11,591)	(602)
Amortization of deferred gains on sale of property, equipment sales to 50% or less owned companies	(1,322)	(1,372)	(1,715)
Sale Leaseback and Financed Equipment Sales
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Balance at beginning of year	39,102	66,519	74,774
Deferred gains arising from equipment sales	0	0	13,336
Reclassification of deferred gains into historical cost on reacquired property and equipment	0	(3,052)	(5,954)
Balance at end of year	8,768	39,102	66,519
Fifty Percent or Less Owned Subsidiaries
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Balance at beginning of year	4,562	5,934	7,649
Balance at end of year	$ 3,240	$ 4,562	$ 5,934
Sale Leaseback | Retained Earnings | Accounting Standards Update 2016-02
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Impact of adoption of accounting principle				$ 29,207

Nature Of Operations And Acc_11

Nature Of Operations And Accounting Policies (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	$ 853,842	$ 753,361	$ 1,196,268
Discontinued Operations			(527,691)
Other comprehensive income (loss)	(16)	(391)	1,707
Income tax (expense) benefit	(68)	22	(702)
Total equity, ending balance	812,514	853,842	753,361
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	(914)	(545)	(11,593)
Discontinued Operations			10,031
Other comprehensive income (loss)	(83)	(391)	1,812
Income tax (expense) benefit	(68)	22	(795)
Total equity, ending balance	(1,065)	(914)	(545)
Derivative Gains (Losses) on Cash Flow Hedges, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	0	0	75
Discontinued Operations			94
Other comprehensive income (loss)	67	0	(260)
Income tax (expense) benefit	0	0	91
Total equity, ending balance	67	0	0
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	0	0	4
Discontinued Operations			0
Other comprehensive income (loss)	0	0	(6)
Income tax (expense) benefit	0	0	2
Total equity, ending balance	0	0	0
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	(914)	(545)	(11,514)
Discontinued Operations			10,125
Other comprehensive income (loss)	(16)	(391)	1,546
Income tax (expense) benefit	(68)	22	(702)
Total equity, ending balance	(998)	(914)	(545)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	0	0	(1,613)
Discontinued Operations			1,460
Other comprehensive income (loss)	0	0	153
Income tax (expense) benefit	0	0	0
Total equity, ending balance	0	0	0
Derivative Losses on Cash Flow Hedges, net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	0	0	(17)
Discontinued Operations			4
Other comprehensive income (loss)	0	0	13
Income tax (expense) benefit	0	0	0
Total equity, ending balance	0	0	0
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	0	0	3
Discontinued Operations			2
Other comprehensive income (loss)	0	0	(5)
Income tax (expense) benefit	0	0	0
Total equity, ending balance	0	0	0
Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total equity, beginning balance	(369)	1,005
Total equity, ending balance	$ (84)	$ (369)	$ 1,005

Nature Of Operations And Acc_12

Nature Of Operations And Accounting Policies (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income	$ (1,917)	$ 6,405	$ 14,553	$ 7,733	$ (4,686)	$ 17,067	$ 45,126	$ 641	$ 26,774	$ 58,148	$ 61,643
Basic Weighted Average Common Shares Outstanding
Options and Restricted Stock									0	0	0
Convertible Securities									1,273	1,273	14,346
Net income, diluted									$ 28,047	$ 59,421	$ 75,989
Weighted average number of shares outstanding, basic (in shares)									18,949,981	18,080,778	17,368,081
Effect of Dilutive Securities:
Options and Restricted Stock (in shares)									129,250	267,810	308,012
Convertible Securities (in shares)									1,227,101	1,227,101	5,258,065
Weighted average number of shares outstanding, diluted (in shares)									20,306,332	19,575,689	22,934,158
Basic earnings per common share (in dollars per share)	$ (0.10)	$ 0.33	$ 0.80	$ 0.42	$ (0.26)	$ 0.94	$ 2.50	$ 0.04	$ 1.41	$ 3.22	$ 3.55
Diluted earnings per common share (in dollars per share)	$ (0.10)	$ 0.32	$ 0.76	$ 0.41	$ (0.26)	$ 0.88	$ 2.14	$ 0.04	$ 1.38	$ 3.04	$ 3.31
3.0% Convertible Senior Notes
Effect of Dilutive Securities:
Debt instrument, stated percentage	3.00%								3.00%
3.25% Convertible Senior Notes
Effect of Dilutive Securities:
Debt instrument, stated percentage	3.25%								3.25%
Stock Compensation Plan
Effect of Dilutive Securities:
Antidilutive securities excluded from computation of earnings per share (in shares)									827,222	333,510	1,924,217
Convertible Debt Securities | 3.0% Convertible Senior Notes
Effect of Dilutive Securities:
Antidilutive securities excluded from computation of earnings per share (in shares)									928,464	1,946,917
Convertible Debt Securities | 3.25% Convertible Senior Notes
Effect of Dilutive Securities:
Antidilutive securities excluded from computation of earnings per share (in shares)									1,553,780	983,351

Business Acquisitions - Narrati

Business Acquisitions - Narrative (Details) $ in Thousands	Jun. 01, 2018USD ($)	Mar. 01, 2018USD ($)numberOfInstallments	Jul. 03, 2017USD ($)vessel	Dec. 31, 2018USD ($)vessel	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Business combination, long-term debt assumed				$ 0	$ 28,725
Cleancor
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	50.00%
Payments to acquire businesses, gross	$ 3,200
Partners' capital account, contributions	$ 1,900
SCA
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 1,500
Business combination, number of installments | numberOfInstallments		2
Business combination, contingent consideration		$ 900
ISH
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 10,500
Business combination, note receivable contributed			18,100
Business combination, long-term debt assumed			$ 28,700
PCTC's | ISH
Business Acquisition [Line Items]
Number of equipment acquired | vessel			4
Bulk carriers - U.S.-flag | ISH
Business Acquisition [Line Items]
Number of equipment acquired | vessel			2	2
Rail ferries - Foreign-flag | ISH
Business Acquisition [Line Items]
Number of equipment acquired | vessel			2

Business Acquisitions - Purchas

Business Acquisitions - Purchase Price Allocation (Details) $ in Thousands	Mar. 01, 2018USD ($)numberOfInstallments	Jul. 03, 2017USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Business Combinations [Abstract]
Restricted cash and restricted cash equivalents			$ 0	$ 13
Trade and other receivables			1,264	15,823
Other current assets			170	2,054
Investments, at Equity, and Advances to 50% or Less Owned Companies			(5,123)	10,000
Property and Equipment			4,382	15,190
Intangible Assets			1,120	10,957
Other Assets			7	(17,863)
Accounts payable and other accrued liabilities			(1,609)	0
Other current liabilities			(439)	(17,214)
Long-Term Debt			0	(28,725)
Deferred Income Taxes			0	3,939
Other Liabilities			0	(42)
Noncontrolling interests in subsidiaries			(82)	0
Purchase price			(310)	(5,868)
Business Acquisition [Line Items]
Cash Acquired			$ 3,600	$ 16,400
ISH
Business Combinations [Abstract]
Long-Term Debt		$ (28,700)
Business Acquisition [Line Items]
Business combination, note receivable contributed		18,100
Payments to acquire businesses, gross		$ 10,500
SCA
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 1,500
Business combination, number of installments | numberOfInstallments	2

Equipment Acquisitions And Di_3

Equipment Acquisitions And Dispositions (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)equipment	Dec. 31, 2018USD ($)equipment	Dec. 31, 2017USD ($)vesselequipment
Property, Plant and Equipment [Line Items]
Capital expenditures	$ 37,786	$ 50,272	$ 114,595
Sales price of equipment	2,500	16,100	164,800
Gain (loss) on disposition of property plant equipment	$ 500	$ 6,600	23,300
Gain (loss) on sale of property, plant and equipment, recognized			10,000
Gain (loss) on sale of property, plant and equipment, deferred			13,300
Sale Leaseback
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of property, plant and equipment, deferred			$ 13,300
Petroleum and chemical carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Sale leaseback transaction, number of leased assets disposed | vessel			1
Sale leaseback transaction, net proceeds			$ 134,900
Sale leaseback transaction, lease terms			104 months
Number of equipment disposed | equipment	0	1	1
Inland river dry-cargo barges
Property, Plant and Equipment [Line Items]
Sale leaseback transaction, number of leased assets disposed | vessel			50
Sale leaseback transaction, net proceeds			$ 12,500
Sale leaseback transaction, lease terms			84 months
Number of equipment disposed | equipment	0	32	50
Inland river specialty barge
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property plant equipment			$ (300)
Number of equipment disposed | vessel			1
Gains on Asset Dispositions and Impairments, Net
Property, Plant and Equipment [Line Items]
Amortization of deferred gains on sale of property	$ 2,400	$ 13,000	$ 2,300

Equipment Acquisitions And Di_4

Equipment Acquisitions And Dispositions (Major Equipment Additions) (Details)	Jul. 03, 2017vessel	Dec. 31, 2019equipment	Dec. 31, 2018vesselequipment	Dec. 31, 2017equipment
Petroleum and chemical carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Number of equipment acquired		0	0	3
Harbor tugs - U.S.-flag
Property, Plant and Equipment [Line Items]
Number of equipment acquired		1	5	1
Harbor tugs - Foreign-flag
Property, Plant and Equipment [Line Items]
Number of equipment acquired		0	0	2
Short-sea container/RORO - Foreign-flag
Property, Plant and Equipment [Line Items]
Number of equipment acquired		0	2	0
Inland river liquid tank barges
Property, Plant and Equipment [Line Items]
Number of equipment acquired		0	0	2
Inland river towboats
Property, Plant and Equipment [Line Items]
Number of equipment acquired		2	0	3
ISH | Bulk carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Number of equipment acquired | vessel	2		2

Equipment Acquisitions And Di_5

Equipment Acquisitions And Dispositions (Major Equipment Dispositions) (Details) - equipment	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Petroleum and chemical carriers - U.S.-flag
Property, Plant and Equipment [Line Items]
Number of equipment disposed	0	1	1
Harbor tugs - U.S.-flag
Property, Plant and Equipment [Line Items]
Number of equipment disposed	0	1	0
Short-sea container/RORO - Foreign-flag
Property, Plant and Equipment [Line Items]
Number of equipment disposed	1	0	0
Inland river dry-cargo barges
Property, Plant and Equipment [Line Items]
Number of equipment disposed	0	32	50
Inland river specialty barges
Property, Plant and Equipment [Line Items]
Number of equipment disposed	0	2	2
Inland river towboats
Property, Plant and Equipment [Line Items]
Number of equipment disposed	0	0	2

Investments, At Equity, And A_3

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Summary of Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Sep. 01, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 157,108	$ 156,886
RF Vessel Holdings
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest			50.00%
Golfo de Mexico
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest			50.00%
VA&E
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	23.80%
Ocean Services
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 78,049	73,940
Ocean Services | Trailer Bridge
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	55.30%
Equity method investments	$ 56,770	56,364
Ocean Services | RF Vessel Holdings
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 15,878	10,826
Ocean Services | Golfo de Mexico
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 3,485	5,272
Ocean Services | KSM
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 1,916	1,478
Inland Services
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 55,092	57,897
Inland Services | SCFCo
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 33,705	37,219
Inland Services | Bunge-SCF Grain
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 15,112	14,738
Inland Services | SCF Bunge Marine
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	62.50%
Equity method investments	$ 3,990	3,144
Inland Services | Other Inland Services
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 2,285	2,796
Witt O'Brien's LLC | O’Brien’s do Brazil
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	50.00%
Equity method investments	$ 1,274	472
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 22,693	24,577
Other | VA&E
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	23.80%
Equity method investments	$ 10,448	13,073
Other | Avion
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	39.10%
Equity method investments	$ 10,706	10,290
Other | Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,539	$ 1,214
Other | Other | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	40.00%
Other | Other | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest	47.50%

Investments, At Equity, And A_4

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Summarized Financial Information For The Company's Investments, At Equity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance Sheet [Abstract]
Current assets	$ 228,420	$ 184,704
Noncurrent assets	101,292	77,929
Current liabilities	160,688	113,784
Noncurrent liabilities	58,413	46,503
Income Statement [Abstract]
Operating Revenues	1,015,627	786,717	$ 1,068,190
Costs and Expenses:
Operating and administrative	1,005,757	771,324	1,035,952
Depreciation	4,968	7,216	11,810
Total costs and expenses	1,010,725	778,540	1,047,762
Gains on Asset Dispositions and Impairments, Net	0	38	16,115
Operating Income (Loss)	4,902	8,215	36,543
Net Income (Loss)	2,922	3,967	23,383
SCFCo
Balance Sheet [Abstract]
Current assets	5,878	8,322
Noncurrent assets	113,638	121,001
Current liabilities	11,077	12,958
Noncurrent liabilities	59,717	56,078
Income Statement [Abstract]
Operating Revenues	45,049	54,486	44,177
Costs and Expenses:
Operating and administrative	39,375	45,911	40,106
Depreciation	10,027	17,901	17,803
Total costs and expenses	49,402	63,812	57,909
Operating Income (Loss)	(4,353)	(9,326)	(13,732)
Interest expense	(6,971)	(6,573)	(6,120)
Other expense, net	(241)	(2,229)	(961)
Net Income (Loss)	$ (11,565)	$ (18,128)	$ (20,813)

Investments, At Equity, And A_5

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details) $ in Thousands	Apr. 30, 2018USD ($)	Sep. 01, 2017USD ($)	Jul. 03, 2017equipment	Dec. 31, 2019USD ($)equipment	Dec. 31, 2018USD ($)equipment	Dec. 31, 2017USD ($)equipment
Schedule of Equity Method Investments [Line Items]
Retained earnings, undistributed earnings (losses) from equity method investees				$ 69,800	$ 65,000
Proceeds on sale of a controlling interest in a subsidiary				0	0	$ 5,000
Proceeds from equity method investment, distribution				100	5,907	12,891
Other significant noncash transaction, value of consideration received				589	0	0
Proceeds from sale of equity method investments				0	78,015	0
Trailer Bridge
Schedule of Equity Method Investments [Line Items]
Payments for advance to affiliate						2,000
Proceeds from collection of advance to affiliate						6,000
RF Vessel Holdings
Schedule of Equity Method Investments [Line Items]
Ownership percentage sold		50.00%
Proceeds on sale of a controlling interest in a subsidiary		$ 1,900
Ownership of equity interest		50.00%
Partners' capital account, contributions				4,700	9,100
Golfo de Mexico
Schedule of Equity Method Investments [Line Items]
Ownership percentage sold		50.00%
Proceeds on sale of a controlling interest in a subsidiary		$ 3,100
Ownership of equity interest		50.00%
Partners' capital account, contributions				500	4,600
Proceeds from equity method investment, distribution						300
KSM
Schedule of Equity Method Investments [Line Items]
Partners' capital account, contributions					1,000	300
SeaJon
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investment, distribution						12,500
Proceeds from equity method investment, distribution, return of capital						3,500
SCFCo
Schedule of Equity Method Investments [Line Items]
Partners' capital account, contributions						400
Payments for advances and loans to affiliate						2,500
Proceeds from collection of advances and loans to affiliate					2,600	1,700
Advances and loans to affiliate				34,300
Equity method investment, difference between carrying amount and underlying equity				20,200
Bunge-SCF Grain
Schedule of Equity Method Investments [Line Items]
Advanced to joint ventures				7,000
SCF Bunge Marine
Schedule of Equity Method Investments [Line Items]
Partners' capital account, contributions				300	500
Proceeds from equity method investment, distribution					4,600	100
Other Inland Services | Dividend Paid
Schedule of Equity Method Investments [Line Items]
Other significant noncash transaction, value of consideration received				600
O’Brien’s do Brazil
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investment, distribution				$ 100	200	100
Hawker Pacific
Schedule of Equity Method Investments [Line Items]
Ownership percentage sold	34.20%
Proceeds from sale of equity method investments	$ 78,000
Realized gain (loss) on disposal of equity method investments	$ 53,900
VA&E
Schedule of Equity Method Investments [Line Items]
Ownership of equity interest				23.80%
Proceeds from equity method investment, distribution					400
Proceeds from equity method investment, distribution, return of capital				$ 3,700
Advances and loans to affiliate				8,300
Line of credit facility, maximum borrowing capacity				3,500
Avion
Schedule of Equity Method Investments [Line Items]
Payments for advance to affiliate						1,000
Proceeds from collection of advance to affiliate						4,000
Proceeds from equity method investment, distribution					800
Other
Schedule of Equity Method Investments [Line Items]
Proceeds from collection of advance to affiliate					400	400
Proceeds from equity method investment, distribution, return of capital					600
Advanced to joint ventures				2,000
Subordinated Debt | VA&E
Schedule of Equity Method Investments [Line Items]
Payments for advances and loans to affiliate				500
Loans to affiliate				4,400
Uncommitted Credit Facility | VA&E
Schedule of Equity Method Investments [Line Items]
Payments for advance to affiliate					5,400	3,500
Proceeds from collection of advance to affiliate					5,400
Time Charter | Trailer Bridge
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				4,000	3,500	3,100
Time Charter | SCF Bunge Marine
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				6,800	3,300	2,100
Technical, Commercial, Administrative and Construction Management Services | Golfo de Mexico
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				1,800	1,100	300
Technical, Commercial and Administrative Management Services | KSM
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				400	400	300
Bareboat Charter | KSM
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				1,400	1,300	1,100
Information Technology Services | SCFCo
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				100	100	100
Rental Income | Bunge-SCF Grain
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				700	900	1,100
Freight Transportation | Bunge-SCF Grain
Schedule of Equity Method Investments [Line Items]
Revenue from related parties				24,900	10,700	7,200
Towing Services | SCF Bunge Marine
Schedule of Equity Method Investments [Line Items]
Related party transaction expense				$ 53,300	54,500	41,400
Management Fees | Hawker Pacific
Schedule of Equity Method Investments [Line Items]
Revenue from related parties					$ 100	$ 300
Offshore tug - U.S.-flag | Trailer Bridge
Schedule of Equity Method Investments [Line Items]
Equipment subject to operating lease, number of units | equipment				1
Rail ferries - Foreign-flag | RF Vessel Holdings
Schedule of Equity Method Investments [Line Items]
Number of equipment committed to purchase | equipment				2
Harbor tugs - Foreign-flag
Schedule of Equity Method Investments [Line Items]
Number of equipment acquired | equipment				0	0	2
Harbor tugs - Foreign-flag | KSM
Schedule of Equity Method Investments [Line Items]
Number of equipment operated | equipment				4
Number of equipment chartered-out | equipment				2
Specialty vessel - Foreign-flag | KSM
Schedule of Equity Method Investments [Line Items]
Number of equipment operated | equipment				2
Ocean liquid tank barge - Foreign-flag | KSM
Schedule of Equity Method Investments [Line Items]
Number of equipment operated | equipment				1
Time Chartered, Inland River Towboats
Schedule of Equity Method Investments [Line Items]
Equipment subject to operating lease, number of units | equipment				8
Time Chartered, Inland River Towboats | SCF Bunge Marine
Schedule of Equity Method Investments [Line Items]
Number of equipment chartered-out | equipment				8
Bareboat Chartered, Inland River Towboats | SCF Bunge Marine
Schedule of Equity Method Investments [Line Items]
Number of equipment chartered-in | equipment				4
Specialty barge | Other Inland Services
Schedule of Equity Method Investments [Line Items]
Number of equipment acquired | equipment				1
RF Vessel Holdings
Schedule of Equity Method Investments [Line Items]
Business acquisition, percentage of voting interests acquired			100.00%
RF Vessel Holdings | Rail ferries - Foreign-flag
Schedule of Equity Method Investments [Line Items]
Number of equipment acquired | equipment			2
Golfo de Mexico
Schedule of Equity Method Investments [Line Items]
Business acquisition, percentage of voting interests acquired			100.00%
Golfo de Mexico | Rail ferries - Foreign-flag
Schedule of Equity Method Investments [Line Items]
Number of equipment acquired | equipment			2

Leases And Notes Receivables Fr

Leases And Notes Receivables From Third Parties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Notes, Loans and Financing Receivable, Net, Noncurrent [Abstract]
Notes receivable	$ 1.1	$ 2.2
Notes receivable third party	(1)	(0.1)	$ (10.1)
Proceeds from collection of notes receivable	$ 2.1	$ 0.6	$ 34.5

Long-Term Debt (Schedule of Com

Long-Term Debt (Schedule of Company's Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 340,235	$ 386,059
Portion due within one year, net of unamortized discount and issue costs	(58,854)	(8,497)
Debt discount included in long-term debt	(19,990)	(28,334)
Debt issuance costs included in long-term debt	(5,779)	(3,100)
Long-term debt, excluding current maturities	255,612	346,128
Convertible Debt | 3.0% Convertible Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	50,041	107,284
Debt discount included in long-term debt	(1,600)	(7,200)
Debt issuance costs included in long-term debt	(200)	(700)
Convertible Debt | 2.5% Convertible Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	64,455	64,455
Convertible Debt | 3.25% Convertible Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	117,782	117,782
Debt discount included in long-term debt	(18,400)	(21,100)
Debt issuance costs included in long-term debt	(1,600)	(1,900)
Line of Credit | SEA-Vista 2015 Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0	87,977
Debt issuance costs included in long-term debt		(400)
Line of Credit | SEA-Vista 2019 Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	100,000	0
Debt issuance costs included in long-term debt	(2,100)
Notes Payable, Other Payables
Debt Instrument [Line Items]
Long-term debt, gross	7,957	8,561
Debt issuance costs included in long-term debt	$ (100)	$ (100)

Long-Term Debt (Schedule Of Lon

Long-Term Debt (Schedule Of Long-Term Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term Debt, Unclassified [Abstract]
2020	$ 60,630
2021	10,499
2022	10,503
2023	10,368
2024	60,244
Years subsequent to 2024	187,991
Long-term debt, gross	$ 340,235	$ 386,059

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details)

Nov. 20, 2023

Feb. 28, 2020USD ($)

Dec. 20, 2019USD ($)

Mar. 19, 2019USD ($)

Oct. 31, 2018USD ($)

May 15, 2018USD ($)

Dec. 20, 2017

Dec. 19, 2017USD ($)

Jul. 03, 2017USD ($)

Apr. 15, 2015USD ($)

Nov. 13, 2013USD ($)

Dec. 31, 2019USD ($)shares$ / shares

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

May 15, 2025

Dec. 19, 2022

Nov. 19, 2020

Jun. 05, 2019USD ($)

Dec. 11, 2012USD ($)

Sep. 24, 2009USD ($)

Debt Instrument [Line Items]

Common stock, par value (in dollars per share) | $ / shares

$ 0.01

Debt extinguishment losses, net

$ (2,244,000)

$ (11,626,000)

$ (819,000)

Payments on long-term debt

169,625,000

225,541,000

Payments for conversion option in convertible debt

146,000

33,000

1,354,000

Long-term debt acquired in business acquisition

0

28,725,000

Letters of credit outstanding amount

$ 1,200,000

Guarantee fee income, interest rate earned on outstanding guarantees

0.50%

Securities Repurchase Plan, Authorized Repurchase Amount

$ 150,000,000

Securities repurchased plan, remaining authorized repurchase amount

$ 129,900,000

SEACOR Marine Holdings Inc.

Debt Instrument [Line Items]

Guarantor obligations, maximum exposure, undiscounted

22,900,000

Guarantee fee income

$ 200,000

300,000

600,000

3.0% Convertible Senior Notes

Debt Instrument [Line Items]

Debt instrument, stated percentage

3.00%

2.5% Convertible Senior Notes | Debt Instrument, Conversion Option

Debt Instrument [Line Items]

Payments for conversion option in convertible debt

1,400,000

3.25% Convertible Senior Notes

Debt Instrument [Line Items]

Debt instrument, stated percentage

3.25%

Convertible Debt

Debt Instrument [Line Items]

Common stock, par value (in dollars per share) | $ / shares

$ 0.01

Convertible Debt | 3.0% Convertible Senior Notes

Debt Instrument [Line Items]

Debt instrument, stated percentage

3.00%

Aggregate principal amount

$ 230,000,000

Bond trading price triggering contingent interest

1,200

Individual bond, face value

$ 1,000

Debt instrument, contingent interest rate

0.45%

Debt instrument, convertible, conversion ratio

0.0125892

Debt instrument, convertible, number of equity instruments (in shares) | shares

629,976

Debt instrument, convertible, discounts and issuance costs, amortization period

7 years

Debt instrument, interest rate, effective percentage

7.40%

Debt conversion, original debt, amount

$ 117,800,000

Debt instrument, repurchased amount

$ 57,200,000

4,900,000

Repayments of long-term debt and payments for conversion option in convertible debt

56,200,000

4,700,000

Debt extinguishment losses, net

$ 2,100,000

$ 5,400,000

Convertible Debt | 3.0% Convertible Senior Notes | Subsequent Event

Debt Instrument [Line Items]

Debt instrument, repurchased amount

$ 2,200,000

Repayments of long-term debt and payments for conversion option in convertible debt

$ 2,200,000

Convertible Debt | 3.0% Convertible Senior Notes | Debt Instrument, Put Option, Period One | Scenario, Forecast

Debt Instrument [Line Items]

Debt instrument, put option, percentage

100.00%

Convertible Debt | 3.0% Convertible Senior Notes | Debt Instrument, Put Option, Period Two | Scenario, Forecast

Debt Instrument [Line Items]

Debt instrument, redemption price, percentage

100.00%

Convertible Debt | 3.0% Convertible Senior Notes | Debt Instrument, Redemption, Period One

Debt Instrument [Line Items]

Debt instrument, redemption price, percentage

100.00%

Convertible Debt | 2.5% Convertible Senior Notes

Debt Instrument [Line Items]

Debt instrument, stated percentage

2.50%

Aggregate principal amount

$ 350,000,000

Bond trading price triggering contingent interest

$ 1,200

Individual bond, face value

$ 1,000

Debt instrument, contingent interest rate

0.25%

Debt instrument, convertible, conversion ratio

0.0190381

Debt instrument, convertible, number of equity instruments (in shares) | shares

1,227,101

Debt instrument, convertible, discounts and issuance costs, amortization period

5 years

Debt instrument, interest rate, effective percentage

2.50%

6.50%

Debt instrument, repurchased amount

$ 61,700,000

Debt extinguishment losses, net

100,000

Payments on long-term debt

60,500,000

Convertible Debt | 2.5% Convertible Senior Notes | Debt Instrument, Conversion Option

Debt Instrument [Line Items]

Repayments of long-term debt and payments for conversion option in convertible debt

61,900,000

Convertible Debt | 2.5% Convertible Senior Notes | Debt Instrument, Put Option, Period One | Scenario, Forecast

Debt Instrument [Line Items]

Debt instrument, put option, percentage

100.00%

Convertible Debt | 2.5% Convertible Senior Notes | Debt Instrument, Redemption, Period One

Debt Instrument [Line Items]

Debt instrument, redemption price, percentage

100.00%

Convertible Debt | 2.5% Convertible Senior Notes | Put Option

Debt Instrument [Line Items]

Debt instrument, repurchased amount

$ 31,000,000

Payments on long-term debt

$ 31,000,000

Convertible Debt | 3.25% Convertible Senior Notes

Debt Instrument [Line Items]

Debt instrument, stated percentage

3.25%

Aggregate principal amount

117,800,000

Bond trading price triggering contingent interest

1,200

Individual bond, face value

$ 1,000

Debt instrument, contingent interest rate

0.45%

Debt instrument, convertible, conversion ratio

0.0131920

Debt instrument, convertible, number of equity instruments (in shares) | shares

1,553,780

Debt instrument, convertible, discounts and issuance costs, amortization period

7 years

Debt instrument, interest rate, effective percentage

7.20%

Payments of debt issuance costs

$ 2,500,000

Long-term debt, net of discount

95,100,000

Debt issuance costs, gross, carrying amount of liability component

2,000,000

Debt instrument, convertible, carrying amount of equity component

22,700,000

Debt issuance costs, gross, carrying amount of equity component

$ 500,000

Convertible Debt | 3.25% Convertible Senior Notes | Debt Instrument, Put Option, Period One | Scenario, Forecast

Debt Instrument [Line Items]

Debt instrument, put option, percentage

100.00%

Convertible Debt | 3.25% Convertible Senior Notes | Debt Instrument, Redemption, Period One

Debt Instrument [Line Items]

Debt instrument, redemption price, percentage

100.00%

Senior Notes | 7.375% Senior Notes

Debt Instrument [Line Items]

Debt instrument, stated percentage

7.375%

Aggregate principal amount

$ 250,000,000

Debt instrument, repurchased amount

$ 147,400,000

5,700,000

7,600,000

Debt extinguishment losses, net

(6,100,000)

(200,000)

Payments on long-term debt

153,000,000

5,900,000

7,700,000

Loss on repurchase of debt instrument

$ 5,600,000

Line of Credit | SEACOR Revolving Credit Facility

Debt Instrument [Line Items]

Payments of debt issuance costs

$ 2,200,000

Line of Credit | SEACOR Revolving Credit Facility | Revolving Credit Facility

Debt Instrument [Line Items]

Payments on long-term debt

$ 25,000,000

Line of credit facility, maximum borrowing capacity

$ 125,000,000

Line of credit facility, unused capacity, commitment fee percentage

0.50%

Proceeds from issuance of long-term debt

$ 25,000,000

Line of credit facility, current borrowing capacity

$ 125,000,000

Line of Credit | SEACOR Revolving Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.75%

Line of Credit | SEACOR Revolving Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

3.00%

Line of Credit | SEACOR Revolving Credit Facility | Revolving Credit Facility | Base Rate | Minimum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

0.75%

Line of Credit | SEACOR Revolving Credit Facility | Revolving Credit Facility | Base Rate | Maximum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.00%

Line of Credit | SEA-Vista 2015 Credit Facility

Debt Instrument [Line Items]

Debt extinguishment losses, net

$ (100,000)

Payments of debt issuance costs

$ 3,100,000

Line of credit facility, maximum borrowing capacity

300,000,000

Line of Credit | SEA-Vista 2015 Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.00%

Line of Credit | SEA-Vista 2015 Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.75%

Line of Credit | SEA-Vista 2015 Credit Facility | Base Rate | Minimum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.25%

Line of Credit | SEA-Vista 2015 Credit Facility | Base Rate | Maximum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.75%

Line of Credit | SEA-Vista 2015 Credit Facility | Revolving Credit Facility

Debt Instrument [Line Items]

Payments on long-term debt

$ 6,000,000

39,000,000

85,900,000

Line of credit facility, maximum borrowing capacity

100,000,000

Proceeds from issuance of long-term debt

44,900,000

Line of Credit | Sea-Vista 2015 Credit Facility, Term Loan A-1 | Secured Debt

Debt Instrument [Line Items]

Aggregate principal amount

80,000,000

Payments on long-term debt

30,600,000

3,300,000

39,400,000

Line of Credit | Sea-Vista 2015 Credit Facility, Term Loan A-2 | Secured Debt

Debt Instrument [Line Items]

Aggregate principal amount

$ 120,000,000

Debt extinguishment losses, net

700,000

Payments on long-term debt

51,400,000

5,500,000

63,100,000

Line of Credit | SEA-Vista 2019 Credit Facility

Debt Instrument [Line Items]

Payments of debt issuance costs

$ 2,100,000

Line of credit facility, maximum borrowing capacity

$ 200,000,000

Line of Credit | SEA-Vista 2019 Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.00%

Line of Credit | SEA-Vista 2019 Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

2.75%

Line of Credit | SEA-Vista 2019 Credit Facility | Base Rate | Minimum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.00%

Line of Credit | SEA-Vista 2019 Credit Facility | Base Rate | Maximum

Debt Instrument [Line Items]

Debt instrument, basis spread on variable rate

1.75%

Line of Credit | SEA-Vista 2019 Credit Facility | Revolving Credit Facility

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 100,000,000

Line of credit facility, unused capacity, commitment fee percentage

0.50%

Line of credit facility, current borrowing capacity

$ 100,000,000

Line of Credit | SEA-Vista 2019 Credit Facility, Term Loan [Member] | Secured Debt

Debt Instrument [Line Items]

Aggregate principal amount

100,000,000

Proceeds from issuance of long-term debt

24,000,000

Proceeds from Issuance of Debt to Extinguish Existing Debt

$ 76,000,000

Debt instrument, periodic payment, principal, Percent

2.50%

Line of Credit | SEA-Vista 2019 Credit Facility, Term Loan [Member] | Secured Debt | Minimum

Debt Instrument [Line Items]

Debt instrument, prepayment increments

$ 1,000,000

Line of Credit | ISH Credit Facility

Debt Instrument [Line Items]

Payments of debt issuance costs

$ 100,000

Line of credit facility, maximum borrowing capacity

25,000,000

Line of Credit | ISH Credit Facility | Secured Debt

Debt Instrument [Line Items]

Aggregate principal amount

20,000,000

Debt extinguishment losses, net

100,000

Payments on long-term debt

12,200,000

7,800,000

Debt instrument, periodic payment, principal

700,000

Line of Credit | ISH Credit Facility | Revolving Credit Facility

Debt Instrument [Line Items]

Payments on long-term debt

5,000,000

Line of credit facility, maximum borrowing capacity

$ 5,000,000

Line of credit facility, unused capacity, commitment fee percentage

0.50%

Notes Payable, Other Payables

Debt Instrument [Line Items]

Payments on long-term debt

$ 600,000

$ 2,100,000

$ 3,000,000

Notes Payable, Other Payables | ISH Acquired Debt

Debt Instrument [Line Items]

Debt instrument, stated percentage

7.00%

Long-term debt acquired in business acquisition

$ 3,900,000

Notes Payable, Other Payables | Equipment and Facility Mortgages | Minimum

Debt Instrument [Line Items]

Debt instrument, stated percentage

3.40%

Notes Payable, Other Payables | Equipment and Facility Mortgages | Maximum

Debt Instrument [Line Items]

Debt instrument, stated percentage

6.00%

Operating Leases (Details)

Operating Leases (Details) - equipment	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Petroleum and Chemical Carriers - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	2
Sale Leaseback Transaction, Lease Terms		104 months
Petroleum and Chemical Carriers - U.S.-flag | Minimum
Operating Leases [Line Items]
Sale Leaseback Transaction, Lease Terms	33
Petroleum and Chemical Carriers - U.S.-flag | Maximum
Operating Leases [Line Items]
Sale Leaseback Transaction, Lease Terms	80
Harbor Tugs - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	4
Pure Car/Truck Carriers - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	4
Inland River Dry-Cargo Barges
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	50
Sale Leaseback Transaction, Lease Terms		84 months
Inland River Towboats
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	4
Inland River Harbor Boats
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	6
Other Equipment | Minimum
Operating Leases [Line Items]
Lessee, Operating Lease, Term of Contract	4 months
Other Equipment | Maximum
Operating Leases [Line Items]
Lessee, Operating Lease, Term of Contract	195 months
Bareboat Chartered, Petroleum and Chemical Carriers - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	4
Bareboat Chartered, Ocean Liquid Tank Barges - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	5
Bareboat Chartered, Harbor Tugs - Foreign-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	6
Time Chartered, Petroleum and Chemical Carriers - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	4
Time Chartered, PCTCs - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	4
Time Chartered, Inland River Towboats
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	8
Time Chartered, Offshore Tug - U.S.-flag
Operating Leases [Line Items]
Equipment Subject to Operating Lease, Number of Units	1

Operating Leases Lessee, Operat

Operating Leases Lessee, Operating Lease, Liability, Maturity (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
Future Minimum Operating Lease Payments, 2020	$ 41,914
Future Minimum Operating Lease Payments, 2021	37,711
Future Minimum Operating Lease Payments, 2022	27,460
Future Minimum Operating Lease Payments, 2023	15,531
Future Minimum Operating Lease Payments, 2024	13,603
Future Minimum Operating Lease Payments, Years subsequent to 2024	27,066
Future Minimum Operating Lease Payments	163,285
Interest component	(18,979)
Operating lease liability	144,306
Current portion of long-term operating lease liabilities	(36,011)
Long-term operating lease liabilities	$ 108,295

Operating Leases Lease, Cost (D

Operating Leases Lease, Cost (Details)	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease expense	$ 42,863,000
Short-term lease expense (lease duration of twelve months or less at lease commencement)	22,992,000
Sublease income	(33,428,000)
Lease cost	$ 32,427,000

Operating Leases Operating Leas

Operating Leases Operating Leases Other Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating cash outflows from operating leases	$ 43,096
Right-of-use assets obtained in exchange for operating lease liabilities	$ 179,944
Weighted average remaining lease term, in years	5 years 2 months 12 days
Weighted average discount rate	4.90%

Operating Leases Schedule of Fu

Operating Leases Schedule of Future Minimum Lease Revenues for Operating Leases (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
Total Minimum Lease Revenues, 2020	$ 160,324
Total Minimum Lease Revenues, 2021	114,395
Total Minimum Lease Revenues, 2022	55,990
Total Minimum Lease Revenues, 2023	34,701
Total Minimum Lease Revenues, 2024	27,205
Total Minimum Lease Revenues, Years subsequent to 2024	55,102
Leased-in Obligations, 2020	(31,572)
Leased-in Obligations, 2021	(29,683)
Leased-in Obligations, 2022	(22,942)
Leased-in Obligations, 2023	(11,315)
Leased-in Obligations, 2024	(11,346)
Leased-in Obligations, Years subsequent to 2024	(18,662)
Net Minimum Lease Income, 2020	128,752
Net Minimum Lease Income, 2021	84,712
Net Minimum Lease Income, 2022	33,048
Net Minimum Lease Income, 2023	23,386
Net Minimum Lease Income, 2024	15,859
Net Minimum Lease Income, Years subsequent to 2024	$ 36,440

Operating Leases Major Classes

Operating Leases Major Classes of Property and Equipment Earning Lease Revenues (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	$ 1,442,382	$ 1,407,329	$ 1,380,469
Accumulated depreciation	(624,024)	(560,819)	(502,544)
Net property and equipment	818,358	$ 846,510	$ 877,925
Property Subject to Operating Lease
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	685,531
Accumulated depreciation	(295,185)
Net property and equipment	390,346
Ocean Services | Property Subject to Operating Lease
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	634,916
Accumulated depreciation	(291,687)
Net property and equipment	343,229
Ocean Services | Property Subject to Operating Lease | Petroleum and Chemical Carriers - U.S.-flag
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	544,549
Accumulated depreciation	(258,153)
Net property and equipment	286,396
Ocean Services | Property Subject to Operating Lease | Harbor and Offshore Tugs - U.S.-flag & foreign-flag
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	51,129
Accumulated depreciation	(17,363)
Net property and equipment	33,766
Ocean Services | Property Subject to Operating Lease | Ocean liquid tank barges - U.S.-flag
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	39,238
Accumulated depreciation	(16,171)
Net property and equipment	23,067
Inland Services | Property Subject to Operating Lease | Inland River Towboats
Major Classes of Property and Equipment Earning Lease Revenues [Line Items]
Historical cost	50,615
Accumulated depreciation	(3,498)
Net property and equipment	$ 47,117

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Tax cuts and jobs act, change in tax rate, deferred tax liability, income tax benefit	$ 66.9
Liability for uncertainty in income taxes				$ 10.1
Increase (decrease) in unrecognized tax benefits	$ (2)
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Operating loss carryforwards, valuation allowance		$ 4.2	$ 4

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Before Income Tax Expense (Benefit) And Equity In Earnings Of 50% Or Less Owned Companies) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	$ 49,097	$ 91,689	$ 35,205
Reportable Geographical Components | United States
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	41,398	33,563	28,546
Reportable Geographical Components | Foreign
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	6,182	56,558	4,748
Eliminations
Income Tax Contingency [Line Items]
Income before income tax expense (benefit) and equity in earnings of 50% or less owned companies	$ 1,517	$ 1,568	$ 1,911

Income Taxes (Components Of Inc

Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
State	$ 739	$ 253	$ 1,136
Federal	(244)	20,776	(17,181)
Foreign	1,165	2,899	333
Current income tax expense (benefit)	1,660	23,928	(15,712)
Deferred:
State	404	(3,001)	12
Federal	7,765	(12,512)	(51,489)
Deferred income tax expense (benefit)	8,169	(15,513)	(51,477)
Income tax expense (benefit)	$ 9,829	$ 8,415	$ (67,189)

Income Taxes (Schedule Of Effec

Income Taxes (Schedule Of Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	35.00%
Income subject to tonnage tax	(2.30%)	(1.30%)	(5.90%)
Dorian distribution	0.00%	0.00%	22.80%
Reversal of uncertain tax position	0.00%	0.00%	(28.70%)
U.S. federal income tax statutory changes	0.00%	0.00%	(190.20%)
Non-deductible expenses	1.60%	0.20%	0.80%
Noncontrolling interests	(3.10%)	(5.70%)	(22.40%)
Foreign earnings not subject to U.S. income tax	(4.10%)	(16.20%)	0.00%
Foreign taxes not creditable against U.S. income tax	1.40%	3.20%	0.00%
Losses of foreign subsidiaries not benefited	0.00%	0.00%	(6.60%)
Subpart F income	1.50%	12.10%	0.00%
State taxes	2.00%	(3.10%)	1.20%
Share award plans	0.60%		2.00%
Share award plans		(0.30%)
Other	1.40%	(0.70%)	1.10%
Effective income tax rate	20.00%	9.20%	(190.90%)

Income Taxes (Components Of The

Income Taxes (Components Of The Net Deferred Income Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax liabilities:
Property and equipment	$ 121,840	$ 93,049
Long-term debt	15,395	18,355
Gains on marketable securities	459	0
Investments in 50% or less owned companies	1,541	1,934
Intangible assets	706	614
Deductible goodwill	1,002	344
Other	0	31
Total deferred tax liabilities	140,943	114,327
Deferred tax assets:
Net operating loss carryforwards	21,385	0
Capital loss carryforwards	5,192	0
Share award plans	3,686	3,711
Losses on marketable securities	0	8,596
Debt and equity issuance costs	515	379
Other	8,721	11,178
Total deferred tax assets	39,499	23,864
Valuation allowance	(4,217)	(3,957)
Net deferred tax assets	35,282	19,907
Net deferred tax liabilities	$ 105,661	$ 94,420

Derivative Instruments And He_3

Derivative Instruments And Hedging Strategies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 30, 2017
Derivatives, Fair Value [Line Items]
Derivative gains (losses) on cash flow hedges	$ 67	$ 0	$ (389)
Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 48,000
Derivative, fixed interest rate	1.74%			2.79%
Derivative gains (losses) on cash flow hedges	$ 100

Derivative Instruments And He_4

Derivative Instruments And Hedging Strategies (Recognized Gains (Losses) On Derivative Instruments Not Designated As Hedging Instruments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Derivative [Line Items]
Derivative gains (losses), net	$ 19,727
Exchange Option Liability
Derivative [Line Items]
Derivative gains (losses), net	19,436
Forward currency exchange, option and future contracts
Derivative [Line Items]
Derivative gains (losses), net	$ 291

Fair Value Measurements (Financ

Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Marketable Security Positions Held By The Company As Of December 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable security gains (losses), net	$ 2,200
Marketable Security Positions Held By The Company As Of December 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable security gains (losses), net		$ (12,400)	$ 100
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents	78,444	147,212
Marketable securities	7,936	30,316
Construction reserve funds		3,908
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents	0	0
Marketable securities	0	0
Construction reserve funds		0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents	0	0
Marketable securities	$ 0	0
Construction reserve funds		$ 0

Fair Value Measurements (Estima

Fair Value Measurements (Estimated Fair Value of Other Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
3.0% Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, stated percentage	3.00%
3.25% Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, stated percentage	3.25%
Convertible Debt | 3.0% Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, stated percentage	3.00%
Convertible Debt | 3.25% Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, stated percentage	3.25%
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable from third parties (included in other receivables and other assets)	$ 1,119	$ 2,182
Investments, at cost, in 50% or less owned companies (included in other assets)	4,201	4,300
Long-term debt, including current portion	314,466	354,625
Estimate of Fair Value Measurement | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable from third parties (included in other receivables and other assets)	0	0
Long-term debt, including current portion	0	0
Estimate of Fair Value Measurement | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable from third parties (included in other receivables and other assets)	1,082	2,159
Long-term debt, including current portion	330,088	353,929
Estimate of Fair Value Measurement | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable from third parties (included in other receivables and other assets)	0	0
Long-term debt, including current portion	$ 0	$ 0

Fair Value Measurements (Non-Fi

Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands	Jun. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, other than temporary impairment		$ 100	$ 900
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, other than temporary impairment		100
Cleancor
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business acquisition, percentage of voting interests acquired	50.00%
Cleancor | Equity in Earnings of 50% or Less Owned Companies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business combination, step acquisition, equity interest in acquiree, remeasurement gain	$ 100
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at equity, and advances in 50% or less owned companies		0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at equity, and advances in 50% or less owned companies		3,219
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at equity, and advances in 50% or less owned companies		$ 0

Stock Repurchases (Details)

Stock Repurchases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury shares	$ 525	$ 12,300
Securities repurchased plan, remaining authorized repurchase amount	$ 129,900
Share Incentive Plans
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares acquired (in shares)	8,338	212,659
Purchase of treasury shares	$ 400	$ 12,300
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares acquired (in shares)	3,912
Purchase of treasury shares	$ 100

Stock Issuances (Details)

Stock Issuances (Details) $ in Millions	Dec. 20, 2017USD ($)shares	Jun. 01, 2017
Equity, Class of Treasury Stock [Line Items]
Common stock, spin-off, conversion ratio		1.005
Dorian LPG
Equity, Class of Treasury Stock [Line Items]
Common stock dividends, shares (in shares) | shares	3,977,135
Dividends | $	$ 31.4
Stock split, conversion ratio	0.2215

Noncontrolling Interests in S_3

Noncontrolling Interests in Subsidiaries (Details) - USD ($) $ in Thousands	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Noncontrolling interests in subsidiaries	$ 788				$ 149,688					$ 788	$ 149,688
Net Income	$ (1,912)	$ 5,861	$ 17,001	$ 13,068	4,434	$ 27,203	$ 46,007	$ 5,558		34,018	83,202	$ 81,709
Net income attributable to noncontrolling interest										$ 7,244	25,054	20,066
SEA-Vista | Ocean Services
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	49.00%									49.00%
Noncontrolling interests in subsidiaries	$ 0				148,665					$ 0	148,665
Other Inland River Services Noncontrolling Interests | Inland Services
Noncontrolling Interest [Line Items]
Noncontrolling interests in subsidiaries	$ 785				862					$ 785	862
Other Inland River Services Noncontrolling Interests | Minimum | Inland Services
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	3.00%									3.00%
Other Inland River Services Noncontrolling Interests | Maximum | Inland Services
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	51.80%									51.80%
Other Noncontrolling Interests | Other
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	5.00%									5.00%
Noncontrolling interests in subsidiaries	$ 3				$ 161					$ 3	161
SEA-Vista | Ocean Services
Noncontrolling Interest [Line Items]
Net Income									$ 14,800		51,200	45,900
Net income attributable to noncontrolling interest									$ 7,200		$ 25,100	$ 22,500

Savings, Multi-Employer And D_3

Savings, Multi-Employer And Defined Benefit Pension Plans (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution percent of employees' gross pay		3.50%
Defined contribution plan, cost		$ 2,200	$ 2,000	$ 1,800
Deferred compensation arrangement with individual, maximum annual salary deferral, percentage		75.00%
Deferred compensation arrangement with individual, maximum cash bonus deferral, percentage		100.00%
Deferred compensation obligation		$ 800	600
ISH Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)	$ 1,300	(500)	(900)
Defined Benefit Plan [Abstract]
Fair Value of Assets		37,723	34,923
Projected Benefit Obligation		(37,583)	(34,299)
Funded Status		$ 140	$ 624
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Benefit obligation, Discount rate		3.10%	4.05%
Benefit obligation, CPI		2.25%	2.25%
Benefit obligation, Cash balance interest credits (compounded annually)		4.00%	4.00%
Net periodic benefit cost, Expected long-term rate of return on plan assets		6.00%	6.75%
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2020		$ 2,250
2021		2,120
2022		2,200
2023		2,180
2024		2,160
American Maritime Officers Pension Plan | Withdrawal from Multiemployer Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Loss contingency, estimate of possible loss					$ 28,100
Multiemployer Plans, Pension
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, contributions by employer		2,600	$ 2,500	2,400
Multiemployer Plans, Postretirement Benefit
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, contributions by employer		$ 1,100	$ 1,000	$ 1,000

Share Based Compensation (Narra

Share Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional compensation expense	$ 5.2	$ 4	$ 32.5
Share-based compensation arrangement by share-based payment award, accelerated compensation cost			$ 16.6
Unrecognized compensation costs	12.8
Compensation costs expected to be recognized in 2020	4.5
Compensation costs expected to be recognized in 2021	$ 3.5
Weighted average values of grants (in dollars per share)	$ 27.67	$ 29.72	$ 37.20
Aggregate intrinsic value of exercised stock options	$ 2.5	$ 3.9	$ 5.6
Weighted average remaining contractual term for total outstanding stock options	5 years 1 month 6 days
Weighted average remaining contractual term for vested/exercisable stock options	3 years 10 months 24 days
Aggregate intrinsic value of options outstanding	$ 3.8
Aggregate intrinsic value of vested/exercisable options outstanding	2.7
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant date fair value of restricted stock vested	$ 1.2		$ 26.1
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for grant (in shares)	900,000
Exercise price per share of options granted, percentage, minimum	85.00%
Increase in number of shares available under employee stock purchase plan (in shares)		300,000
Employee common stock purchase plan, duration		10 years
Employee common stock purchase plan, offering period	six
Employee Stock Options and Stock Options Issued for Services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected volatility	28.20%	26.60%	25.50%
Weighted average discount rates	1.88%	2.78%	1.92%
Expected lives	5 years 9 months	5 years 6 months 29 days	5 years 7 months 2 days
Share Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for grant (in shares)	6,650,000
Exercise price per share of options granted, percentage, minimum	100.00%
Share Incentive Plans | Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and stock options vesting period	1 year
Share Incentive Plans | Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and stock options vesting period	5 years
Share Incentive Plans | Employee Stock Option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and stock options vesting period	1 year
Share Incentive Plans | Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock and stock options vesting period	5 years

Share Based Compensation (Share

Share Based Compensation (Share Based Compensation Plans) (Details) - shares	Jun. 02, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted stock awards granted (in shares)		149,950	121,850	153,100
Restricted stock awards forfeited (in shares)		(4,230)	0	(2,444)
Director stock awards granted (in shares)		2,125	2,875	1,750
Stock Option Activities:
Outstanding as of the beginning of year (in shares)		1,467,391	1,546,014	1,639,865
Granted (in shares)	846,353	165,650	142,550	1,013,893
Exercised (in shares)		(165,893)	(220,694)	(562,587)
Forfeited (in shares)		(5,200)	0	(3,374)
Expired (in shares)		(7,874)	(479)	(541,783)
Outstanding as of the end of year (in shares)		1,454,074	1,467,391	1,546,014
Employee Stock Purchase Plans shares issued (in shares)		44,383	45,251	36,552
Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year (in shares)		539,414	884,218	896,265

Share Based Compensation (Sched

Share Based Compensation (Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity) (Details) - Restricted Stock	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Number of Shares
Nonvested, beginning balance (in shares) | shares	121,850
Granted (in shares) | shares	149,950
Vested (in shares) | shares	(26,390)
Forfeited (in shares) | shares	4,230
Nonvested, ending balance (in shares) | shares	241,180
Weighted Average Grant Price
Nonvested, beginning balance, Weighted Average Grant Price (in dollars per share) | $ / shares	$ 46.66
Granted, Weighted Average Grant Price (in dollars per share) | $ / shares	43.20
Vested, Weighted Average Grant Price (in dollars per share) | $ / shares	46.58
Forfeited, Weighted Average Grant Price (in dollars per share) | $ / shares	44.66
Nonvested, ending balance, Weighted Average Grant Price (in dollars per share) | $ / shares	$ 44.55

Share Based Compensation (Sch_2

Share Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - $ / shares	Jun. 02, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Option Activities:
Outstanding as of the beginning of year (in shares)		1,467,391	1,546,014	1,639,865
Granted (in shares)	846,353	165,650	142,550	1,013,893
Exercised (in shares)		(165,893)	(220,694)	(562,587)
Forfeited (in shares)		(5,200)	0	(3,374)
Expired (in shares)		(7,874)	(479)	(541,783)
Outstanding as of the end of year (in shares)		1,454,074	1,467,391	1,546,014
Outstanding and Exercisable, end of period (in shares)		1,013,705
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning balance, Weighted Average Exercise Price (in dollars per share)		$ 41.72
Granted, Weighted Average Exercise Price (in dollars per share)		43.77
Exercised, Weighted Average Exercise Price (in dollars per share)		31.61
Forfeited, Weighted Average Exercise Price (in dollars per share)		43.47
Expired, Weighted Average Exercise Price (in dollars per share)		48.84
Outstanding, ending balance, Weighted Average Exercise Price (in dollars per share)		43.19	$ 41.72
Outstanding and Exercisable, end of period, Weighted Average Exercise Price (in dollars per share)		$ 43.60

Related Party Transactions (Det

Related Party Transactions (Details) - Affiliated Entity - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dry-Cargo Barge Pools Management
Related Party Transaction [Line Items]
Related party transaction, amounts	$ 0.5	$ 0.9	$ 0.6
Revenue from related parties	0.1	0.1	0.1
Payables to related parties	0.1	0.5
SEACOR Marine Holdings Inc. | Transition Services
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.6	$ 4.6	$ 3.5

Commitments And Contingencies_2

Commitments And Contingencies (Capital Commitments and Narrative) (Details) $ in Thousands	Feb. 28, 2020USD ($)claimequipment	Oct. 16, 2019claim	Aug. 02, 2016claim	Feb. 16, 2016claim	Jan. 10, 2020claim	Dec. 31, 2019USD ($)equipment
Commitments and Contingencies [Line Items]
Unrecorded unconditional purchase obligation, due in next twelve months						$ 28,639
Unrecorded unconditional purchase obligation, due within two years						30,965
Unrecorded Unconditional Purchase Obligation, Due within Three Years						2,636
Unrecorded unconditional purchase obligation						62,240
Deepwater Horizon Oil Spill Multi District Litigation
Commitments and Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number | claim			11	11
BP counter claims ORM and NRC
Commitments and Contingencies [Line Items]
Loss contingency, new claims filed | claim		4
BP counterclaims ORM's insurer
Commitments and Contingencies [Line Items]
Loss contingency, new claims filed | claim		2
Subsequent Event
Commitments and Contingencies [Line Items]
Unrecorded unconditional purchase obligation	$ 2,500
Subsequent Event | BELO/ORM
Commitments and Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number | claim	450
Loss contingency, new claims filed | claim	2,380
Subsequent Event | BELO/NRC
Commitments and Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number | claim	35
Loss contingency, new claims filed | claim	230
Subsequent Event | BP counter claims ORM and NRC
Commitments and Contingencies [Line Items]
Loss contingency, pending claims | claim					3
Ocean Services
Commitments and Contingencies [Line Items]
Unrecorded unconditional purchase obligation, due in next twelve months						22,394
Unrecorded unconditional purchase obligation, due within two years						30,965
Unrecorded Unconditional Purchase Obligation, Due within Three Years						2,636
Unrecorded unconditional purchase obligation						$ 55,995
Ocean Services | Harbor Tugs - U.S.-flag
Commitments and Contingencies [Line Items]
Number of equipment committed to purchase | equipment						4
Ocean Services | Rail ferries - Foreign-flag
Commitments and Contingencies [Line Items]
Number of equipment committed to purchase | equipment						2
Inland Services
Commitments and Contingencies [Line Items]
Unrecorded unconditional purchase obligation, due in next twelve months						$ 5,663
Unrecorded unconditional purchase obligation, due within two years						0
Unrecorded Unconditional Purchase Obligation, Due within Three Years						0
Unrecorded unconditional purchase obligation						$ 5,663
Inland Services | Inland River Dry-Cargo Barges
Commitments and Contingencies [Line Items]
Number of equipment committed to purchase | equipment						4
Inland Services | Inland river towboats
Commitments and Contingencies [Line Items]
Number of equipment committed to purchase | equipment						2
Inland Services | Subsequent Event | Inland River Dry-Cargo Barges
Commitments and Contingencies [Line Items]
Number of equipment committed to purchase | equipment	2
Other
Commitments and Contingencies [Line Items]
Unrecorded unconditional purchase obligation, due in next twelve months						$ 582
Unrecorded unconditional purchase obligation, due within two years						0
Unrecorded Unconditional Purchase Obligation, Due within Three Years						0
Unrecorded unconditional purchase obligation						$ 582

Segment Information (Operating

Segment Information (Operating Results, Capital Expenditures And Assets By Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Revenues:
Operating revenues	$ 192,761	$ 200,658	$ 197,023	$ 209,524	$ 213,838	$ 220,257	$ 216,831	$ 184,824	$ 799,966	$ 835,750	$ 650,847
Costs and Expenses:
Operating									583,633	591,848	433,837
Administrative and general									105,517	102,907	103,106
Depreciation and amortization									68,571	74,579	75,058
Total costs and expenses									757,721	769,334	612,001
Gains (losses) on asset dispositions and impairments, net									2,910	19,583	11,637
Operating Income	2,562	$ 12,519	$ 11,106	$ 18,968	25,250	$ 34,047	$ 12,014	$ 14,688	45,155	85,999	50,483
Other Income (Expense):
Derivative gains, net									0	0	19,727
Foreign currency (gains) losses, net									(312)	(2,264)	323
Other Income (Expense), Net									(134)	54,964	256
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									(5,250)	(72)	2,952
Income Before Taxes and Equity in Earnings (Losses)									49,097	91,689	35,205
Capital Expenditures									37,786	50,272	114,595
Property and Equipment:
Historical cost	1,442,382				1,407,329				1,442,382	1,407,329	1,380,469
Accumulated depreciation	(624,024)				(560,819)				(624,024)	(560,819)	(502,544)
Net property and equipment	818,358				846,510				818,358	846,510	877,925
Operating Lease Right-of-Use Assets	144,539								144,539
Investments, at Equity, and Advances to 50% or Less Owned Companies	157,108				156,886				157,108	156,886	173,441
Inventories	5,255				4,530				5,255	4,530	4,377
Goodwill	32,701				32,708				32,701	32,708	32,761
Intangible Assets	20,996				24,551				20,996	24,551	28,106
Other current and long-term assets, excluding cash and near cash assets	247,635				224,403				247,635	224,403	160,398
Total Assets	1,512,972				1,471,024				1,512,972	1,471,024	1,613,336
Ocean Services
Operating Revenues:
Operating revenues									423,288	414,844	352,876
Inland Services
Operating Revenues:
Operating revenues									267,334	285,688	248,452
Witt O'Brien's LLC
Operating Revenues:
Operating revenues									101,663	131,629	49,055
Other
Operating Revenues:
Operating revenues									7,681	3,589	464
Intersegment Eliminations
Operating Revenues:
Operating revenues									(120)	(80)	(101)
Intersegment Eliminations | Ocean Services
Operating Revenues:
Operating revenues									0	0	0
Intersegment Eliminations | Inland Services
Operating Revenues:
Operating revenues									0	0	0
Intersegment Eliminations | Witt O'Brien's LLC
Operating Revenues:
Operating revenues									(120)	(80)	(101)
Intersegment Eliminations | Other
Operating Revenues:
Operating revenues									0	0	0
Operating Segments | Ocean Services
Operating Revenues:
Operating revenues									423,288	414,844	352,876
Costs and Expenses:
Operating									280,809	269,294	195,285
Administrative and general									40,215	40,179	36,548
Depreciation and amortization									40,986	46,270	46,073
Total costs and expenses									362,010	355,743	277,906
Gains (losses) on asset dispositions and impairments, net									1,291	12,887	(323)
Operating Income									62,569	71,988	74,647
Other Income (Expense):
Derivative gains, net											0
Foreign currency (gains) losses, net									(98)	(168)	(130)
Other Income (Expense), Net									(112)	570	327
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									(669)	3,632	7,664
Segment Profit (Loss)									61,690	76,022	82,508
Capital Expenditures									4,859	39,207	80,006
Property and Equipment:
Historical cost	932,267				930,230				932,267	930,230	901,076
Accumulated depreciation	(380,553)				(341,999)				(380,553)	(341,999)	(299,528)
Net property and equipment	551,714				588,231				551,714	588,231	601,548
Operating Lease Right-of-Use Assets	109,460								109,460
Investments, at Equity, and Advances to 50% or Less Owned Companies	78,049				73,939				78,049	73,939	52,003
Inventories	2,233				2,196				2,233	2,196	2,352
Goodwill	1,852				1,852				1,852	1,852	1,852
Intangible Assets	7,637				8,965				7,637	8,965	10,293
Other current and long-term assets, excluding cash and near cash assets	54,842				48,770				54,842	48,770	49,498
Total Assets	805,787				723,953				805,787	723,953	717,546
Operating Segments | Inland Services
Operating Revenues:
Operating revenues									267,334	285,688	248,452
Costs and Expenses:
Operating									229,418	237,010	206,836
Administrative and general									13,140	13,139	16,558
Depreciation and amortization									23,262	24,164	25,852
Total costs and expenses									265,820	274,313	249,246
Gains (losses) on asset dispositions and impairments, net									1,602	6,659	11,960
Operating Income									3,116	18,034	11,166
Other Income (Expense):
Derivative gains, net											0
Foreign currency (gains) losses, net									(212)	(2,002)	272
Other Income (Expense), Net									0	51	0
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									(6,520)	(5,686)	(5,191)
Segment Profit (Loss)									(3,616)	10,397	6,247
Capital Expenditures									30,040	8,298	34,322
Property and Equipment:
Historical cost	469,120				438,848				469,120	438,848	448,035
Accumulated depreciation	(216,296)				(195,094)				(216,296)	(195,094)	(181,573)
Net property and equipment	252,824				243,754				252,824	243,754	266,462
Operating Lease Right-of-Use Assets	31,338								31,338
Investments, at Equity, and Advances to 50% or Less Owned Companies	55,092				57,899				55,092	57,899	66,479
Inventories	2,510				1,997				2,510	1,997	1,934
Goodwill	2,343				2,350				2,343	2,350	2,403
Intangible Assets	7,497				8,991				7,497	8,991	10,486
Other current and long-term assets, excluding cash and near cash assets	71,043				78,903				71,043	78,903	71,500
Total Assets	422,647				393,894				422,647	393,894	419,264
Operating Segments | Witt O'Brien's LLC
Operating Revenues:
Operating revenues									101,783	131,709	49,156
Costs and Expenses:
Operating									68,052	83,203	32,017
Administrative and general									25,959	24,772	13,438
Depreciation and amortization									835	1,944	819
Total costs and expenses									94,846	109,919	46,274
Gains (losses) on asset dispositions and impairments, net									18	0	0
Operating Income									6,955	21,790	2,882
Other Income (Expense):
Derivative gains, net											0
Foreign currency (gains) losses, net									(1)	(28)	50
Other Income (Expense), Net									(463)	0	0
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									902	203	174
Segment Profit (Loss)									7,393	21,965	3,106
Capital Expenditures									47	0	60
Property and Equipment:
Historical cost	1,134				1,227				1,134	1,227	1,227
Accumulated depreciation	(993)				(1,031)				(993)	(1,031)	(938)
Net property and equipment	141				196				141	196	289
Operating Lease Right-of-Use Assets	3,045								3,045
Investments, at Equity, and Advances to 50% or Less Owned Companies	1,274				471				1,274	471	777
Inventories	266				179				266	179	91
Goodwill	28,506				28,506				28,506	28,506	28,506
Intangible Assets	5,862				6,595				5,862	6,595	7,327
Other current and long-term assets, excluding cash and near cash assets	108,373				81,410				108,373	81,410	28,398
Total Assets	147,467				117,357				147,467	117,357	65,388
Operating Segments | Other
Operating Revenues:
Operating revenues									7,681	3,589	464
Costs and Expenses:
Operating									5,464	2,455	0
Administrative and general									3,489	1,841	831
Depreciation and amortization									1,982	501	0
Total costs and expenses									10,935	4,797	831
Gains (losses) on asset dispositions and impairments, net									32	37	0
Operating Income									(3,222)	(1,171)	(367)
Other Income (Expense):
Derivative gains, net											0
Foreign currency (gains) losses, net									0	(3)	6
Other Income (Expense), Net									431	54,249	(301)
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									1,037	1,779	305
Segment Profit (Loss)									(1,754)	54,854	(357)
Capital Expenditures									1,997	2,639	0
Property and Equipment:
Historical cost	8,897				6,892				8,897	6,892	0
Accumulated depreciation	(2,450)				(490)				(2,450)	(490)	0
Net property and equipment	6,447				6,402				6,447	6,402	0
Operating Lease Right-of-Use Assets	0								0
Investments, at Equity, and Advances to 50% or Less Owned Companies	22,693				24,577				22,693	24,577	54,182
Inventories	246				158				246	158	0
Goodwill	0				0				0	0	0
Intangible Assets	0				0				0	0	0
Other current and long-term assets, excluding cash and near cash assets	4,760				2,142				4,760	2,142	1,391
Total Assets	34,146				33,279				34,146	33,279	55,573
Corporate And Eliminations
Operating Revenues:
Operating revenues									(120)	(80)	(101)
Costs and Expenses:
Operating									(110)	(114)	(301)
Administrative and general									22,714	22,976	35,731
Depreciation and amortization									1,506	1,700	2,314
Total costs and expenses									24,110	24,562	37,744
Gains (losses) on asset dispositions and impairments, net									(33)	0	0
Operating Income									(24,263)	(24,642)	(37,845)
Other Income (Expense):
Derivative gains, net											19,727
Foreign currency (gains) losses, net									(1)	(63)	125
Other Income (Expense), Net									10	94	230
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									0	0	0
Capital Expenditures									843	128	207
Property and Equipment:
Historical cost	30,964				30,132				30,964	30,132	30,131
Accumulated depreciation	(23,732)				(22,205)				(23,732)	(22,205)	(20,505)
Net property and equipment	7,232				7,927				7,232	7,927	9,626
Operating Lease Right-of-Use Assets	696								696
Investments, at Equity, and Advances to 50% or Less Owned Companies	0				0				0	0	0
Inventories	0				0				0	0	0
Goodwill	0				0				0	0	0
Intangible Assets	0				0				0	0	0
Other current and long-term assets, excluding cash and near cash assets	8,617				13,178				8,617	13,178	9,611
Segment Reconciling Items
Other Income (Expense):
Other Income (Expense), Net									4,388	(47,010)	(35,584)
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax									5,250	72	(2,952)
Property and Equipment:
Cash and near cash assets	$ 86,380				$ 181,436				$ 86,380	$ 181,436	$ 336,328

Segment Information (Disaggrega

Segment Information (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Lease revenues									$ 217,230	$ 201,112	$ 191,526
Operating revenues	$ 192,761	$ 200,658	$ 197,023	$ 209,524	$ 213,838	$ 220,257	$ 216,831	$ 184,824	799,966	835,750	650,847
Voyage charters
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									46,381	73,979	33,623
Contracts of affreightment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									226,857	231,247	204,261
Tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									79,757	74,157	68,266
Unit freight
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									63,420	58,326	50,693
Terminal operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									16,562	21,501	21,488
Fleeting operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									17,264	17,888	15,561
Logistics services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									15,155	14,309	8,868
Time and material contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									87,167	119,196	33,352
Retainer contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									9,874	10,124	10,192
Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									5,555	2,686
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									14,744	11,225	13,017
Ocean Services
Disaggregation of Revenue [Line Items]
Operating revenues									423,288	414,844	352,876
Inland Services
Disaggregation of Revenue [Line Items]
Operating revenues									267,334	285,688	248,452
Witt O’Brien’s
Disaggregation of Revenue [Line Items]
Operating revenues									101,663	131,629	49,055
Other
Disaggregation of Revenue [Line Items]
Operating revenues									7,681	3,589	464
Operating Segments | Ocean Services
Disaggregation of Revenue [Line Items]
Lease revenues									205,346	193,242	183,234
Operating revenues									423,288	414,844	352,876
Operating Segments | Ocean Services | Voyage charters
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									46,381	73,979	33,623
Operating Segments | Ocean Services | Contracts of affreightment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									24,540	11,872	15,181
Operating Segments | Ocean Services | Tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									79,757	74,157	68,266
Operating Segments | Ocean Services | Unit freight
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									63,420	58,326	50,693
Operating Segments | Ocean Services | Terminal operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Ocean Services | Fleeting operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Ocean Services | Logistics services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Ocean Services | Time and material contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Ocean Services | Retainer contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Ocean Services | Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0
Operating Segments | Ocean Services | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									3,844	3,268	1,879
Operating Segments | Inland Services
Disaggregation of Revenue [Line Items]
Lease revenues									10,902	7,392	8,292
Operating revenues									267,334	285,688	248,452
Operating Segments | Inland Services | Voyage charters
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Inland Services | Contracts of affreightment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									202,317	219,375	189,080
Operating Segments | Inland Services | Tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Inland Services | Unit freight
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Inland Services | Terminal operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									16,562	21,501	21,488
Operating Segments | Inland Services | Fleeting operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									17,264	17,888	15,561
Operating Segments | Inland Services | Logistics services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									15,155	14,309	8,868
Operating Segments | Inland Services | Time and material contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Inland Services | Retainer contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Inland Services | Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0
Operating Segments | Inland Services | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									5,134	5,223	5,163
Operating Segments | Witt O’Brien’s
Disaggregation of Revenue [Line Items]
Lease revenues									0	0	0
Operating revenues									101,783	131,709	49,156
Operating Segments | Witt O’Brien’s | Voyage charters
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Contracts of affreightment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Unit freight
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Terminal operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Fleeting operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Logistics services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Witt O’Brien’s | Time and material contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									87,167	119,196	33,352
Operating Segments | Witt O’Brien’s | Retainer contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									9,874	10,124	10,192
Operating Segments | Witt O’Brien’s | Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0
Operating Segments | Witt O’Brien’s | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									4,742	2,389	5,612
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Lease revenues									982	478	0
Operating revenues									7,681	3,589	464
Operating Segments | Other | Voyage charters
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Contracts of affreightment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Unit freight
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Terminal operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Fleeting operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Logistics services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Time and material contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Retainer contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Operating Segments | Other | Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									5,555	2,686
Cost of goods and services sold									4,500	2,100
Operating Segments | Other | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									1,144	425	464
Corporate And Eliminations
Disaggregation of Revenue [Line Items]
Lease revenues									0	0	0
Operating revenues									(120)	(80)	(101)
Corporate And Eliminations | Voyage charters
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Contracts of affreightment
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Tariff
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Unit freight
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Terminal operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Fleeting operations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Logistics services
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Time and material contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Retainer contracts
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0	0
Corporate And Eliminations | Product sales
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									0	0
Corporate And Eliminations | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									$ (120)	$ (80)	$ (101)

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Costs and Expenses [Abstract]
Net Income (Loss)	$ 0	$ 0	$ (23,637)
Discontinued Operations
Costs and Expenses [Abstract]
Net Income (Loss)			(23,637)
Reportable Legal Entities | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SEACOR Marine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues			62,291
Costs and Expenses [Abstract]
Operating			65,888
Administrative and general			29,682
Depreciation and amortization			22,181
Total costs and expenses			117,751
Gains on Asset Dispositions, Net			4,219
Operating Income (Loss)			(51,241)
Other Income, Net			1,780
Income Tax Expense (Benefit)			(12,931)
Equity in Earnings of 50% or Less Owned Companies, Net of Tax			1,663
Net Income (Loss)			(34,867)
Net Loss Attributable to Noncontrolling Interests			(1,892)
Reportable Legal Entities | Discontinued Operations, Disposed of by Sale | Illinois Corn Processing LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues			78,061
Costs and Expenses [Abstract]
Operating			76,306
Administrative and general			2,140
Depreciation and amortization			2,354
Total costs and expenses			80,800
Operating Income (Loss)			(2,739)
Other Income, Net			20,557
Income Tax Expense (Benefit)			7,818
Net Income (Loss)			10,000
Net Loss Attributable to Noncontrolling Interests			(539)
Eliminations | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues			(1,176)
Costs and Expenses [Abstract]
Operating			(1,289)
Administrative and general			(42)
Total costs and expenses			(1,331)
Operating Income (Loss)			155
Other Income, Net			1,738
Income Tax Expense (Benefit)			663
Net Income (Loss)			$ 1,230

Quarterly Financial Informati_3

Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Operating Revenues	$ 192,761	$ 200,658	$ 197,023	$ 209,524	$ 213,838	$ 220,257	$ 216,831	$ 184,824	$ 799,966	$ 835,750	$ 650,847
Operating Income	2,562	12,519	11,106	18,968	25,250	34,047	12,014	14,688	45,155	85,999	50,483
Net Income (loss)	(1,912)	5,861	17,001	13,068	4,434	27,203	46,007	5,558	34,018	83,202	81,709
Net Income (Loss) attributable to SEACOR Holdings Inc.	$ (1,917)	$ 6,405	$ 14,553	$ 7,733	$ (4,686)	$ 17,067	$ 45,126	$ 641	$ 26,774	$ 58,148	$ 61,643
Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. (in dollars per share)	$ (0.10)	$ 0.33	$ 0.80	$ 0.42	$ (0.26)	$ 0.94	$ 2.50	$ 0.04	$ 1.41	$ 3.22	$ 3.55
Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. (in dollars per share)	$ (0.10)	$ 0.32	$ 0.76	$ 0.41	$ (0.26)	$ 0.88	$ 2.14	$ 0.04	$ 1.38	$ 3.04	$ 3.31

Valuation And Qualifying Acco_2

Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year	$ 3,481	$ 2,390	$ 2,989
Charges (Credits) to Cost and Expenses	2,021	2,067	(175)
Deductions	(2,631)	(976)	(424)
Balance End of Year	$ 2,871	$ 3,481	$ 2,390

Uncategorized Items - ckh-20191

Label	Element	Value
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 879,201,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	750,894,000
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,596,642,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,573,013,000
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	490,332,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	416,661,000
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	159,524,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	129,678,000
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(1,366,773,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(1,368,300,000)
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(914,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(545,000)
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	390,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	387,000
Accounting Standards Update 2016-02 [Member] | Noncontrolling Interest [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 9,836,000