Macquarie Infrastructure (MIC) 10-K 22 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 18, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-32384
Entity Registrant Name	MACQUARIE INFRASTRUCTURE HOLDINGS, LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-2708886
Entity Address, Address Line One	125 West 55th Street
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
City Area Code	212
Local Phone Number	231-1000
Title of 12(b) Security	Common Units
Trading Symbol	MIC
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,801,365,531
Entity Common Stock, Shares Outstanding		88,416,085
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001845290

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Dallas, Texas
Auditor Firm ID	185

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 47,259	$ 1,518,108
Restricted cash		1,051	1,036
Accounts receivable, net of allowance for doubtful accounts		27,824	23,113
Inventories		11,658	9,564
Prepaid expenses		1,813	2,212
Other current assets		3,164	1,715
Current assets held for sale	[1]	0	2,185,002
Total current assets		92,769	3,740,750
Property, equipment, land, and leasehold improvements, net		297,190	297,375
Operating lease assets, net		12,591	9,878
Goodwill		120,193	120,193
Intangible assets, net		4,498	4,923
Other noncurrent assets		9,210	5,520
Total assets		536,451	4,178,639
Current liabilities:
Due to Manager-related party		260	1,203
Accounts payable		6,169	13,082
Accrued expenses		18,449	17,798
Current portion of long-term debt		1,107	1,060
Distribution payable		0	960,981
Operating lease liabilities - current		1,794	2,019
Other current liabilities		5,223	9,591
Current liabilities held for sale	[1]	0	1,613,830
Total current liabilities		33,002	2,619,564
Long-term debt, net of current portion		97,655	578,169
Deferred income taxes		38,540	26,453
Operating lease liabilities - noncurrent		10,810	7,869
Other noncurrent liabilities		53,062	53,278
Total liabilities		233,069	3,285,333
Commitments and contingencies		0	0
Unitholders' equity:
Common units paid in capital (500,000,000 authorized; 88,343,762 and 87,361,929 units issued and outstanding on December 31, 2021 and 2020, respectively)	[2]	193,471	178,062
Accumulated other comprehensive loss	[2]	(5,106)	(6,175)
Retained earnings	[2]	106,539	713,129
Total unitholders’ equity	[2]	294,904	885,016
Noncontrolling interests		8,478	8,290
Total equity		303,382	893,306
Total liabilities and equity		$ 536,451	$ 4,178,639
[1]	See Note 4, “Discontinued Operations and Dispositions”, for further discussions on assets and liabilities held for sale.
[2]	The Company is authorized to issue 100,000,000 preferred units. On December 31, 2021 and 2020, no preferred units were issued or outstanding. The Company had 100 special units issued and outstanding to its Manager on December 31, 2021 and 2020, respectively. See Note 11, “Unitholders' Equity”, for further discussions.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common units, shares authorized (in shares)	500,000,000	500,000,000	500,000,000
Common units, shares issued (in shares)	88,343,762	87,361,929
Common units, shares outstanding (in shares)	88,343,762	87,361,929
Preferred units, shares authorized (in shares)	100,000,000	100,000,000
Preferred units, shares issued (in shares)	0	0
Preferred units, shares outstanding (in shares)	0	0
Special units, shares issued (in shares)	100	100
Special units, shares outstanding (in shares)	100	100

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Product revenue		$ 235,984	$ 180,411	$ 242,637
Total revenue		235,984	180,411	242,637
Costs and expenses
Cost of product sales		165,927	112,283	165,504
Selling, general and administrative		97,893	72,704	38,596
Disposition payment to manager		228,570	28,174	0
Total Selling, general and administrative		326,463	100,878	38,596
Fees to Manager - related party		21,857	21,063	32,103
Depreciation		15,313	15,463	14,985
Amortization of intangibles		425	425	425
Total operating expenses		529,985	250,112	251,613
Operating loss		(294,001)	(69,701)	(8,976)
Other income (expense)
Interest income		27	26	17
Interest expense	[1]	(14,381)	(21,103)	(22,609)
Other income (expense), net		234	(1,690)	(5,324)
Net loss from continuing operations before income taxes		(308,121)	(92,468)	(36,892)
Benefit (provision) for income taxes		7,827	(4,177)	11,640
Net loss from continuing operations		(300,294)	(96,645)	(25,252)
Discontinued Operations
Net income (loss) from discontinued operations before income taxes	[2]	3,050,811	(684,660)	261,451
Provision for income taxes	[2]	(66,458)	(146,419)	(83,046)
Net income (loss) from discontinued operations	[2]	2,984,353	(831,079)	178,405
Net income (loss)		2,684,059	(927,724)	153,153
Net loss from continuing operations		(300,294)	(96,645)	(25,252)
Less: net income (loss) attributable to noncontrolling interests		191	137	(246)
Net loss from continuing operations attributable to MIH		(300,485)	(96,782)	(25,006)
Net income (loss) from discontinued operations	[2]	2,984,353	(831,079)	178,405
Less: net loss attributable to noncontrolling interests		0	0	(3,109)
Net income (loss) from discontinued operations attributable to MIH		2,984,353	(831,079)	181,514
Net income (loss) attributable to MIH		$ 2,683,868	$ (927,861)	$ 156,508
Basic loss per unit from continuing operations attributable to MIH (in dollars per share)		$ (3.42)	$ (1.11)	$ (0.29)
Basic income (loss) per unit from discontinued operations attributable to MIH (in dollars per share)		33.99	(9.56)	2.11
Basic income (loss) per unit attributable to MIH (in dollars per share)		$ 30.57	$ (10.67)	$ 1.82
Weighted average number of units outstanding: basic (in shares)		87,791,951	86,951,642	86,178,212
Diluted loss per unit from continuing operations attributable to MIH (in dollars per share)		$ (3.42)	$ (1.11)	$ (0.29)
Diluted income (loss) income per unit from discontinued operations attributable to MIH (in dollars per share)		33.99	(9.56)	2.11
Diluted income (loss) income per unit attributable to MIH (in dollars per share)		$ 30.57	$ (10.67)	$ 1.82
Weighted average number of units outstanding: diluted (in shares)		87,791,951	86,951,642	86,178,212
Cash distributions declared per unit (in dollars per share)		$ 37.386817	$ 11	$ 4
[1]	Interest expense includes non-cash gains on derivative instruments of $333,000 in 2021 and non-cash losses on derivative instruments of $912,000 and $875,000 in 2020 and 2019, respectively.
[2]	See Note 4, “Discontinued Operations and Dispositions”, for further discussions on businesses classified as held for sale.

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gain (loss) on derivative instruments	$ 6,279	$ (29)	$ (10,957)
Interest Expense
Gain (loss) on derivative instruments	$ 333	$ (912)	$ (875)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 2,684,059	$ (927,724)	$ 153,153
Other comprehensive income (loss), net of taxes:
Change in post-retirement benefit plans	[1]	1,075	(15,723)	(8,533)
Translation adjustment	[2]	0	1,141	1,932
Reclassification to net income (loss) due to sale of business	[3]	(6)	45,279	0
Other comprehensive income (loss)		1,069	30,697	(6,601)
Comprehensive income (loss)		2,685,128	(897,027)	146,552
Less: comprehensive income (loss) attributable to noncontrolling interests		191	137	(3,355)
Comprehensive income (loss) attributable to MIH		$ 2,684,937	$ (897,164)	$ 149,907
[1]	Change in post-retirement benefit plans is presented net of tax benefit of $375,000, $6.1 million, and $3.4 million in 2021, 2020, and 2019, respectively. See Note 11, “Unitholders’ Equity”, for further discussions.
[2]	Translation adjustment is presented net of tax expense of $444,000 and $751,000 in 2020 and 2019, respectively. See Note 11, “Unitholders’ Equity”, for further discussions.
[3]	Reclassified to discontinued operations in the consolidated statement of operations in connection with the AA transaction in 2021 and the IMTT Transaction in 2020. See Note 4, "Discontinued Operations and Dispositions", for further discussions.

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Change in post retirement benefit plans represented net tax benefit of	$ 375	$ 6,100	$ 3,400
Translation adjustment, tax expense		$ 444	$ 751

CONSOLIDATED STATEMENTS OF UNIT

CONSOLIDATED STATEMENTS OF UNITHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	[5]	Manager	Total Unitholders’ Equity	Total Unitholders’ EquityCumulative Effect, Period of Adoption, Adjustment	[5]	Total Unitholders’ EquityManager	Special Units	Common Units		Common UnitsManager	Common Units Paid In Capital	Common Units Paid In CapitalCumulative Effect, Period of Adoption, Adjustment	[5]	Common Units Paid In CapitalManager	Accumulated Other Comprehensive Loss	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	[5]	Noncontrolling Interests	[2]
Beginning balance, special units (in shares) at Dec. 31, 2018										100
Beginning balance, common units (in shares) at Dec. 31, 2018	[1]										85,800,303
Beginning balance at Dec. 31, 2018		$ 3,116,327				$ 2,964,602								$ 1,510,391				$ (30,271)	$ 1,484,482			$ 151,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of units to Manager (in shares)	[1]												776,353
Issuance of units to Manager					$ 31,367				$ 31,367								$ 31,367
Units vested under compensation plans (in shares)	[1],[3]										23,646
Unit-based compensation expense		958				958								958
Registration costs		(95)				(95)								(95)
Distributions to common unitholders	[4]	(344,689)				(344,689)								(344,689)
Distributions to noncontrolling interests		(2,492)																				(2,492)
Contributions from noncontrolling interests		166																				166
Deconsolidation of noncontrolling interest		(137,888)																				(137,888)
Comprehensive income (loss), net of taxes		146,552				149,907												(6,601)	156,508			(3,355)
Ending balance, special units (in shares) at Dec. 31, 2019										100
Ending balance, common units (in shares) at Dec. 31, 2019	[1]										86,600,302
Ending balance at Dec. 31, 2019		2,810,206				2,802,050								1,197,932				(36,872)	1,640,990			8,156
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of units to Manager (in shares)	[1]												701,030
Issuance of units to Manager					22,905				22,905								22,905
Units vested under compensation plans (in shares)	[1],[3]										81,366
Units withheld for taxes on vested units (in shares)	[1],[3]										(20,769)
Unit-based compensation expense		4,948				4,948								4,948
Distributions to common unitholders	[4]	(1,047,723)				(1,047,723)								(1,047,723)
Distributions to noncontrolling interests		(3)																				(3)
Comprehensive income (loss), net of taxes		$ (897,027)				(897,164)												30,697	(927,861)			137
Ending balance, special units (in shares) at Dec. 31, 2020		100								100
Ending balance, common units (in shares) at Dec. 31, 2020		87,361,929									87,361,929	[1]
Ending balance at Dec. 31, 2020		$ 893,306	$ (7,159)			885,016	$ (7,159)							178,062	$ (14,121)			(6,175)	713,129	$ 6,962		8,290
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]		Accounting Standards Update 2020-06
Issuance of units to Manager (in shares)	[1]												764,602
Issuance of units to Manager					$ 22,799				$ 22,799								$ 22,799
Units vested under compensation plans (in shares)	[1],[3]										281,206
Units withheld for taxes on vested units (in shares)	[1],[3]										(63,975)
Unit-based compensation expense		$ 6,731				6,731								6,731
Distributions to common unitholders	[4]	(3,297,420)				(3,297,420)													(3,297,420)
Distributions to noncontrolling interests		(3)																				(3)
Comprehensive income (loss), net of taxes		$ 2,685,128				2,684,937												1,069	2,683,868			191
Ending balance, special units (in shares) at Dec. 31, 2021		100								100
Ending balance, common units (in shares) at Dec. 31, 2021		88,343,762									88,343,762	[1]
Ending balance at Dec. 31, 2021		$ 303,382				$ 294,904								$ 193,471				$ (5,106)	$ 106,539			$ 8,478
[1]	The Company is authorized to issue 500,000,000 common units.
[2]	Includes $141.5 million of noncontrolling interest related to discontinued operations on December 31, 2019. See Note 4, “Discontinued Operations and Dispositions”, for further discussions.
[3]	Units vested and issued under the 2016 Omnibus Employee Incentive Plan and 2014 Independent Directors Equity Plan. Under the 2016 Omnibus Employee Incentive Plan, units are withheld for the employee portion of taxes on vested awards and are available for future grants. See Note 11, "Unitholders' Equity," for further discussions.
[4]	See Note 11, “Unitholders' Equity”, for discussion on distributions declared and paid on units for each period.
[5]	On January 1, 2021, the Company adopted ASU No. 2020-06, Debt - Debt with Conversion and Other Options, using the modified retrospective method and made an adjustment to the beginning balance to Retained Earnings of $7.0 million, net of taxes. See Note 9, “Long-Term Debt”, for further discussions.

CONSOLIDATED STATEMENTS OF UN_2

CONSOLIDATED STATEMENTS OF UNITHOLDERS' EQUITY (Parenthetical) $ in Thousands	Dec. 31, 2019USD ($)shares
Common units, shares authorized (in shares) | shares	500,000,000
Disposal group, noncontrolling interest	$ 141,500
Balance as of period date	2,810,206
Retained Earnings
Balance as of period date	$ 1,640,990

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net loss from continuing operations		$ (300,294)	$ (96,645)	$ (25,252)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities from continuing operations:
Depreciation		15,313	15,463	14,985
Amortization of intangibles		425	425	425
Write-off of debt financing cost		4,170	0	0
Amortization of debt discount and financing costs		738	5,744	5,626
Adjustments to derivative instruments		(943)	(6,598)	6,009
Fees to Manager - related party		21,857	21,063	32,103
Deferred taxes		(2,612)	3,376	(15,169)
Other non-cash expense, net		4,887	6,634	9,947
Changes in other assets and liabilities, net of acquisitions:
Accounts receivable		(4,741)	2,529	3,694
Inventories		(3,489)	1,764	(1,869)
Prepaid expenses and other current assets		(1,704)	(168)	(280)
Accounts payable and accrued expenses		(7,904)	2,492	4,746
Income taxes payable		(6,611)	(3,842)	440
Other, net		(7,279)	1,405	(4,235)
Net cash (used in) provided by operating activities from continuing operations		(288,187)	(46,358)	31,170
Investing activities
Acquisitions of businesses and investments, net of cash, cash equivalents, and restricted cash acquired		0	0	(94)
Purchases of property and equipment		(14,261)	(14,471)	(19,791)
Other, net		186	44	34
Net cash used in investing activities from continuing operations		(14,075)	(14,427)	(19,851)
Financing activities
Payment of long-term debt		(496,629)	(1,260)	(727)
Distributions paid to common unitholders		(4,258,401)	(86,742)	(344,689)
Distributions paid to noncontrolling interests		(3)	(3)	(5)
Debt financing costs paid		(293)	0	0
Net cash used in financing activities from continuing operations		(4,755,326)	(88,005)	(345,421)
Net change in cash, cash equivalents, and restricted cash from continuing operations		(5,057,588)	(148,790)	(334,102)
Cash flows provided by (used in) discontinued operations:
Net cash provided by operating activities		28,965	386,983	389,966
Net cash provided by investing activities		3,242,836	1,253,261	10,797
Net cash used in financing activities		(5,123)	(10,700)	(337,095)
Net cash provided by discontinued operations		3,266,678	1,629,544	63,668
Effect of exchange rate changes on cash and cash equivalents		0	(99)	255
Net change in cash, cash equivalents, and restricted cash		(1,790,910)	1,480,655	(270,179)
Cash, cash equivalents, and restricted cash, beginning of period		1,839,220	358,565	628,744
Cash, cash equivalents, and restricted cash, end of period		48,310	1,839,220	358,565
Non-cash investing and financing activities:
Cash distribution declared, but not yet paid		0	960,981	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		47,259	1,518,108	57,230
Restricted cash - current		1,051	1,036	1,165
Cash, cash equivalents and restricted cash included in assets held for sale	[1]	0	320,076	300,170
Total of cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows		48,310	1,839,220	358,565
Continuing Operations
Non-cash investing and financing activities:
Accrued purchases of property and equipment		614	761	1,074
Leased assets obtained in exchange for new operating lease liabilities		0	0	1,522
Taxes paid (received), net		(195)	0	(1,500)
Interest paid, net		13,688	14,699	15,132
Discontinued Operations
Non-cash investing and financing activities:
Accrued purchases of property and equipment		4,201	28,081	30,853
Leased assets obtained in exchange for new operating lease liabilities		14,666	20,393	19,115
Taxes paid (received), net		143,906	(10,686)	66,056
Interest paid, net		$ 29,616	$ 95,670	$ 122,890
[1]	Represents cash, cash equivalents, and restricted cash related to businesses classified as held for sale. See Note 4, "Discontinued Operations and Dispositions", for further discussions

Organization and Description of

Organization and Description of Business	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Macquarie Infrastructure Holdings, LLC ("MIH") is a Delaware limited liability company formed on February 5, 2021 and the registrant since September 22, 2021. MIH is the successor to Macquarie Infrastructure Corporation ("MIC"), a Delaware corporation formed on May 21, 2015. MIC’s predecessor, Macquarie Infrastructure Company LLC, was formed on April 13, 2004. Except as otherwise specified, all references in this Form 10-K to "MIH" or the "Company" refers to Macquarie Infrastructure Holdings, LLC and its subsidiaries, or as necessary when referring to previous reporting periods or the period prior to September 22, 2021, MIC and its subsidiaries. MIH is externally managed by Macquarie Infrastructure Management (USA) Inc. (the "Manager"), pursuant to the terms of a Management Services Agreement, subject to the oversight and supervision of the Board. Six of the eight members of the Board, and all members of each of the Company's Audit, Compensation, and Nominating and Governance Committees, are independent and have no affiliation with Macquarie. The Manager is a member of the Macquarie Group of companies comprising Macquarie Group Limited and its subsidiaries and affiliates worldwide. Macquarie Group Limited is headquartered in Australia and is listed on the Australian Securities Exchange. The Company owns and operates businesses that provide products to corporations, government agencies, and individual customers in Hawaii. The Company's operations consist of businesses comprising an energy company that processes and distributes gas and provides related services, Hawaii Gas, and several smaller operations collectively engaged in efforts to reduce the cost and improve the reliability and sustainability of energy in Hawaii. In October 2019, along with actively managing its existing portfolio of businesses, the Board resolved to pursue strategic alternatives including potentially a sale of the Company or its then three operating businesses as a means of unlocking additional value for equity holders. During the quarter ended September 30, 2020, the Company's International-Matex Tank Terminals ("IMTT") business was classified as a discontinued operation and eliminated as a reportable segment. All periods reported herein reflect this change. In December 2020, the Company completed the sale of IMTT (the "IMTT Transaction"). For additional information, see Note 4, “Discontinued Operations and Dispositions”. On June 7, 2021, the Company entered into an agreement for the sale of its Atlantic Aviation business to KKR Apple Bidco, LLC, a Delaware limited liability company controlled by funds affiliated with Kohlberg Kravis Roberts & Co. L.P. (“KKR”), for $4.475 billion including cash and the assumption of debt and other transaction and reorganization related obligations (the "AA Transaction"). On June 14, 2021, the Company entered into a m erger agreement (the "Merger Agreement") with AMF Hawaii Holdings, LLC ("AMF Parent"), a Delaware limited liability company affiliated with Argo Infrastructure Partners, LP ("Argo"), and AMF Hawaii Merger Sub, LLC ("AMF Merger Sub"), a recently formed Delaware limited liability company and wholly-owned direct subsidiary of AMF Parent (the "Merger"). Upon the completion of the Merger, each of the MIH common units (excluding common units held by AMF Parent or AMF Merger Sub or common units held by MIH in treasury and common units held by any subsidiary of MIH or AMF Parent (other than AMF Merger Sub)), will be converted into the right to receive $3.83 in cash, without interest; or, if the Merger is consummated after July 1, 2022, then each such unit will be converted into the right to receive $4.11 in cash, without interest. Under the terms of the Merger Agreement, at closing, AMF Parent will pay the merger consideration to unitholders, and fund transaction costs and fund a disposition payment to MIH’s Manager of $81.7 million if the Merger closes on or before July 1, 2022 or $56.7 million if the Merger closes after this date. On September 21, 2021, the Company conducted a Special Meeting of Shareholders during which shareholders voted on and approved the AA Transaction and the Merger. As a result, MIH classified its Atlantic Aviation business as a discontinued operation. On September 22, 2021, shareholders of Macquarie Infrastructure Corporation became unitholders of Macquarie Infrastructure Holdings, LLC, a limited liability company treated as a partnership for tax purposes, on a one-for-one basis without an exchange of certificates. Commencing September 23, 2021, units of Macquarie Infrastructure Holdings, LLC traded on the New York Stock Exchange ("NYSE") under the same symbol (NYSE: MIC) and with the same CUSIP number (55608B105) as previously associated with shares of Macquarie Infrastructure Corporation. As part of the reorganization, the entity holding the businesses comprising MIC's MIC Hawaii segment was distributed to and became a direct subsidiary of Macquarie Infrastructure Holdings, LLC. For tax purposes, the distribution was deemed to be a sale of MIC Hawaii by MIC and unitholders were deemed to have received a distribution of the fair market value of the equity of that segment. On September 23, 2021, MIH completed the AA Transaction, and received $3.525 billion at the closing. The MIH Board elected to return certain proceeds from the AA Transaction to unitholders, declaring a one-time distribution of $37.386817 per common unit of the Company, paid on October 7, 2021 to unitholders of record as of the close of trading on October 4, 2021. The Company's common units traded with due-bills attached from October 1, 2021 through October 7, 2021 pursuant to relevant NYSE rules. In addition, MIH made a disposition payment to the Manager of $228.6 million. See Note 4, “Discontinued Operations and Dispositions” for further information. The Merger is expected to be completed in the first half of 2022 subject to the approval by the Hawaii Public Utilities Commission ("HPUC") and the satisfaction of customary closing conditions for this type of transaction. Upon the closing of the Merger, the Company will no longer be a publicly traded entity.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company consolidates investments where it has a controlling financial interest. The general condition for a controlling financial interest is ownership of a majority of the voting interest and, therefore, as a general rule, ownership, directly or indirectly, of over 50% of the outstanding voting shares is a condition for consolidation. In addition, if the Company demonstrates that it has the ability to direct policies and management, this may be also an indication for consolidation. For investments in variable interest entities, the Company consolidates when it is determined to be the primary beneficiary of the variable interest entity. The Company is the primary beneficiary in the solar facilities in Hawaii and consolidated these projects accordingly. Use of Estimates The preparation of the consolidated financial statements, which are in conformity with generally accepted accounting principles ("GAAP"), requires the Company to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting period. The Company evaluates these estimates and judgments on an ongoing basis and the estimates are based on experience, current and expected future conditions, third-party evaluations, and various other assumptions that the Company believes are reasonable under the circumstances. Significant items subject to such estimates and assumptions include the carrying amount of property, equipment, land, and leasehold improvements, intangibles, and goodwill; assets and obligations related to employee benefits; and valuation of derivative instruments. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from the estimates and assumptions used in the financial statements and related notes. Business Combinations Acquisitions of businesses that the Company controls are accounted for under the purchase method of accounting. The amounts assigned to the identifiable assets acquired and liabilities assumed in connection with acquisitions are based on estimated fair values as of the date of the acquisition, with the remainder, if any, recorded as goodwill. The fair values are determined by the Company’s management, taking into consideration information supplied by the management of acquired entities and other relevant information. Such information includes valuations supplied by independent appraisal experts for significant business combinations. The valuations are generally based upon future cash flow projections for the acquired assets, discounted to a present value. The determination of fair value requires significant judgment both by management and outside experts engaged to assist in this process. Cash and Cash Equivalents The Company considers all highly liquid investments, including commercial paper issued by counterparties with Standard & Poor's rating of A1+ or higher, with maturity of three months or less when purchased to be cash and cash equivalents. The Company did not have any investments in commercial paper on December 31, 2021 and 2020. Restricted Cash On December 31, 2021 and 2020, restricted cash consists primarily of deposits held by banks to fund certain obligations under its agreements in place at the solar facilities in Hawaii. Allowance for Doubtful Accounts The Company uses estimates to determine the amount of allowance for doubtful accounts necessary to reduce accounts receivable to its net realizable value. The Company estimates the required allowance by reviewing the status of past-due receivables and analyzing historical bad debt trends. Actual collection experience has not varied significantly from estimates primarily due to credit policies and a lack of concentration of accounts receivable. The Company writes-off receivables deemed to be uncollectible to the allowance for doubtful accounts. Inventory Inventory consists principally of gas purchased from various third-party vendors and materials and supplies. Gas inventory is stated at the lower of cost or market and materials and supplies inventory are valued at the lower of average cost or market. Inventory sold is recorded using an average cost method at the businesses in Hawaii. Cash flows related to the sale of inventory are classified in net cash provided by operating activities in the consolidated statements of cash flows. The Company’s inventory balance on December 31, 2021 comprised $4.6 million of inventory for sale and $7.1 million of materials and supplies compared with $2.3 million of inventory for sale and $7.3 million of materials and supplies on December 31, 2020. Property, Equipment, Land, and Leasehold Improvements Property, equipment, land, and leasehold improvements are initially recorded at cost. Major renewals and improvements are capitalized while repair and maintenance expenditures are expensed when incurred. Interest expense relating to construction in progress is capitalized as an additional cost of the asset. The Company depreciates property, equipment, and leasehold improvements over their estimated useful lives on a straight-line basis. The estimated economic useful lives range is up to 68 years for buildings, leasehold and land improvements, machinery and equipment, and furniture and fixtures. Goodwill and Intangible Assets Goodwill consists of costs in excess of the aggregate purchase price over the fair value of tangible and identifiable intangible net assets acquired in business combinations. The cost of intangible assets with determinable useful lives is amortized over their estimated useful lives of 20 years. Impairment of Long-lived Assets, Excluding Goodwill Long-lived assets, including amortizable intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or group of assets may not be fully recoverable. These events or changes in circumstances may include a significant deterioration of operating results, changes in business plans, or changes in anticipated future cash flows. If an impairment indicator is present, the Company evaluates recoverability by comparing the carrying amount of the assets to future undiscounted net cash flows expected to be generated by the assets. If the assets are impaired, the impairment recognized is measured by the amount by which the carrying amount exceeds the fair value of the assets. Fair value is generally determined by estimates of discounted cash flows or value expected to be realized in a third-party sale. The discount rate used in any estimate of discounted cash flows would be the rate required for a similar investment of like risk. Impairment of Goodwill Goodwill is tested for impairment at least annually on October 1 or when there is a triggering event that indicates the possibility of an impairment. For the annual impairment test, an entity can make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before performing a quantitative goodwill impairment test, as discussed below. If an entity concludes it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, it need not perform the quantitative impairment test. If an entity concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, or if there is a triggering event that indicates impairment, the entity needs to perform a quantitative impairment test. This requires management to make judgments in determining what assumptions to use in the calculation. The Company estimates the fair value by estimating the present value of the future discounted cash flows or value expected to be realized in a third-party sale. If the recorded net assets are less than the estimated fair value, then no impairment is indicated. If the recorded amount of goodwill exceeds the estimated fair value, an impairment charge is recorded for the excess. See Note 8, “Intangible Assets and Goodwill”, for further discussions on goodwill impairment testing. Leases The Company accounts for leases in accordance with ASC 842, Leases , which requires a lessee to recognize on its balance sheet the right-of-use ("ROU") assets and lease liabilities with lease terms of more than 12 months. The substantial population of the Company’s ROU assets and lease liabilities related to Atlantic Aviation’s operating leases of land, buildings, and certain equipment, which are included in assets and liabilities held for sale as of December 31, 2020. ROU assets represent the Company’s right to use an underlying asset for the lease term and the lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. The Company has made an accounting policy election to keep leases with an initial term of 12 months or less off the balance sheet and has elected the practical expedient whereby the Company will not separate a qualifying contract into its lease and non-lease components. See Note 5, "Leases", for further disclosure on operating leases. Impairment of Indefinite-lived Intangibles, Excluding Goodwill Indefinite-lived intangibles, which consist of trademarks, are considered impaired when the carrying amount of the asset exceeds its estimated fair value. The Company estimates the fair value of each trademark using the relief from royalty method that discounts the estimated net cash flows the Company would have to pay to license the trademark under an arm’s length licensing agreement. If the recorded indefinite-lived intangible is less than its estimated fair value, then no impairment is indicated. Alternatively, if the recorded intangible asset exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. Debt Financing Costs The Company capitalizes all direct costs incurred in connection with the issuance of debt as debt financing costs. On December 31, 2021, these costs are amortized over the contractual term of the debt instrument which ranges from 4 to 10 years with a weighted average remaining life of 2.9 years. Derivative Instruments From time to time the Company enters into interest rate derivative agreements to minimize potential variations in cash flows resulting from fluctuations in interest rates and their impact on its variable-rate debt. Hawaii Gas enters into commodity cost hedges to mitigate the impact of fluctuations in liquefied petroleum gas ("LPG") prices on its cash flows. The Company accounts for derivatives and hedging activities in accordance with Accounting Standard Codification ("ASC") 815, Derivatives and Hedging , which requires that all derivative instruments be recorded on the balance sheet at their respective fair values. All movements in the fair value of derivative contracts are recorded directly through earnings. See Note 10, “Derivative Instruments and Hedging Activities”, for further discussions. Financial Instruments The Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, and variable-rate senior debt, are carried at cost, which approximates their fair value because of either the short-term maturity, or competitive interest rates assigned to these financial instruments. The fair values of the Company’s other debt instruments fall within level 1 or level 2 of the fair value hierarchy. Concentrations of Credit Risk Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company places its cash and cash equivalents with financial institutions and its balances may exceed federally insured limits. The Company’s accounts receivable balances are mainly derived from gas sales rendered under contract terms with commercial and private customers located in the United States. On December 31, 2021 and 2020, there were no outstanding accounts receivable due from a single customer that accounted for more than 10% of the total accounts receivable. Additionally, no single customer accounted for more than 10% of the Company’s revenue in 2021, 2020, and 2019. Foreign Currency Translation The assets and liabilities of IMTT’s Newfoundland and Quebec locations were translated from their local currency (Canadian dollars) to U.S. dollars at exchange rates in effect at the end of the reporting period and consolidated statement of operations accounts are translated at average exchange rates for the reporting period. Translation gains or losses as a result of changes in the exchange rate were recorded as a component of other comprehensive income (loss) through the date of sale. Accrued Expenses Accrued expenses of $18.4 million and $17.8 million on December 31, 2021 and 2020, respectively, primarily consisted of payroll and related liabilities, interest, non-income related taxes, insurance, purchase of property and equipment, and other individually insignificant balances. Income per Unit The Company calculates income per unit using the weighted average number of common units outstanding during the period. Diluted income per unit is computed using the weighted average number of dilutive common equivalent units outstanding during the period. Common equivalent units may consist of (i) units issuable upon conversion of the Company’s convertible senior notes (using the if-converted method); (ii) director share units granted to the Company’s independent directors under the 2014 Independent Directors Equity Plan; (iii) stock units granted to certain employees of the Company's operating businesses under the 2016 Omnibus Employee Incentive Plan; and (iv) fees payable to the Manager that will be reinvested in common units by the Manager in a future period, if any. Common equivalent units are excluded from the calculation if their effect is anti-dilutive. Comprehensive Income (Loss) The Company follows the requirements of ASC 220, Comprehensive Income , for the reporting and presentation of comprehensive income (loss) and its components, net of taxes. For the Company, the guidance requires unrealized gains or losses on foreign currency translation adjustments and minimum pension liability adjustments to be included in other comprehensive income (loss), net of taxes. Regulatory Assets and Liabilities The utility operations of Hawaii Gas are subject to regulation with respect to rates, service, maintenance of accounting records, and various other matters by the HPUC. The established accounting policies recognize the financial effects of the rate-making and accounting practices and policies of the HPUC. Regulated utility operations are subject to the provisions of ASC 980, Regulated Operations . This guidance requires regulated entities to disclose in their financial statements the authorized recovery of costs associated with regulatory decisions. Accordingly, certain costs that otherwise would normally be charged to expense may, in certain instances, be recorded as an asset in a regulatory entity’s balance sheet. The Hawaii Gas business records regulatory assets as costs that have been deferred for which future recovery through customer rates may be approved by the HPUC in a future proceeding. Regulatory liabilities represent amounts included in rates and collected from customers for costs expected to be incurred in the future. ASC 980 may, at some future date, be deemed inapplicable because of changes in the regulatory and competitive environments or other factors. If the Company were to discontinue the application of this guidance, the Company would be required to write-off its regulatory assets and regulatory liabilities and would be required to adjust the carrying amount of any other assets, including property, plant, and equipment, that would be deemed not recoverable related to these affected operations. The Company believes its regulated operations in the Hawaii Gas business continue to meet the criteria of ASC 980 and that the carrying value of its regulated property, plant, and equipment is recoverable in accordance with established HPUC rate-making practices. Income Taxes MIH is a limited liability company treated as a partnership for tax purposes. Taxable income/losses reported by MIH will be passed-through to the unitholders and reported on a Schedule K-1. MIH does not pay a state or federal income tax. As a partnership, MIH itself will not pay income tax on the gain from the AA Transaction. As part of the reorganization, the entity holding the businesses comprising MIC's MIC Hawaii segment was distributed to and became directly owned by MIH. For tax purposes, the distribution was deemed to be a sale and unitholders were deemed to have received a distribution of the fair market value of the equity of MIC's MIC Hawaii segment. Following the reorganization, the subsidiaries of the Company are owned by an intermediate holding company organized as a limited liability company and classified as a corporation for tax purposes. The intermediate holding company files a combined Hawaii state income tax return and will file a consolidated federal income tax return for the periods after the reorganization. The intermediate holding company accounts for income taxes using the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The intermediate holding company and its more than 80% owned subsidiaries will file a consolidated U.S. federal income tax return. In assessing the need for a valuation allowance, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Reclassifications Certain reclassifications were made to the consolidated financial statements for the prior periods to conform to current year presentation. Recently Issued Accounting Standards In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40). The amendments in this ASU impact the accounting for convertible instruments by reducing the number of accounting models used to account for these instruments and amending diluted earnings per share calculations. It also simplifies the requirements for contracts indexed to and potentially settled in an entity's own equity. The amendments in this update are effective for fiscal years ending after December 15, 2021. Early adoption is permitted. The Company adopted this ASU on January 1, 2021 using the modified retrospective method and made an adjustment to the beginning balance to Retained Earnings. The impact of this ASU has been reflected in the consolidated financial statements and disclosures related to the Company's convertible debt instruments. See Note 9, "Long-Term Debt", for further discussions. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of Effects of Reference Rate Reform on Financial Reporting , which provides practical expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The expedients and exceptions provided by the amendments in this update apply only to contracts, hedging relationships, and other transactions that reference the London interbank offered rate ("LIBOR") or another reference rate expected to be discontinued as a result of reference rate reform. In January 2021, the FASB also issued ASU No. 2021-01, Reference Rate Reform (Topic 848): Scope , which clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. These amendments are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. These amendments are not applicable to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. ASU No. 2020-04 and ASU No. 2021-01 are effective as of March 12, 2020 and through December 31, 2022, and may be applied to contract modifications and hedging relationships from the beginning of an interim period that includes or is subsequent to March 12, 2020. The Company is currently evaluating the impact of adoption on its financial statements and related disclosures.

Impact of COVID-19

Impact of COVID-19	12 Months Ended
	Dec. 31, 2021
Unusual or Infrequent Items, or Both [Abstract]
Impact of COVID-19	Impact of COVID-19Visitor arrivals to Hawaii, the primary driver of increases in demand for gas in Hawaii, improved sequentially in the fourth quarter of 2021 as increased visitor confidence levels due to the availability of COVID-19 vaccines and a relatively low level of infections in the islands combined to create an attractive environment for visitors from the U.S. mainland. The rate of recovery in the number of visitors to Hawaii in the future remains uncertain. COVID-19 continues to negatively affect the performance of the Hawaii businesses, although the effects have diminished relative to this time last year. The easing of travel restrictions has resulted in an increase in economic activity and the number of primarily domestic visitors to Hawaii, but not to pre-COVID-19 levels. A significant surge in COVID-19 rates could negatively impact the number of visitors to Hawaii, which would adversely impact our operating results.Trends in the number of visitors to Hawaii and demand for gas were positive in the fourth quarter of 2021, although the financial performance of the Company continues to be adversely affected relative to pre-COVID-19 periods. The number of visitors to Hawaii increased to 1.9 million and 6.8 million for the quarter and year ended December 31, 2021, respectively, from 497,000 and 2.7 million for the quarter and year ended December 31, 2020, respectively. The resulting improvement in hotel occupancy, restaurants patronage, and use of commercial laundry services contributed to an increase in gas consumption of 29% and 21% during the quarter and year ended December 31, 2021, respectively, versus the comparable periods in 2020. The number of visitors to Hawaii was lower by 25% and 35% in the quarter and year ended December 31, 2021, respectively, and overall gas consumption was lower by 6% and 11% versus the comparable periods in 2019.

Discontinued Operations and Dis

Discontinued Operations and Dispositions	12 Months Ended
	Dec. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations and Dispositions	Discontinued Operations and Dispositions The Company accounts for disposals that represent a strategic shift that should have or will have a major effect on operations as discontinued operations in the consolidated statements of operations commencing in the period in which the business or group of businesses meets the criteria of a discontinued operation. These results include any gain or loss recognized on disposal or adjustment of the carrying amount to fair value less cost to sell. AA Transaction On September 23, 2021, MIH completed the AA Transaction for $4.475 billion including cash and the assumption of debt and other transaction and reorganization related obligations. The Company received $3.525 billion from KKR at the closing of the AA Transaction. The MIH Board elected to return certain proceeds from the AA Transaction to unitholders in a one-time distribution, after a disposition payment by MIH to the Manager of $228.6 million. The Board declared a one-time distribution of $37.386817 per common unit of the Company, paid on October 7, 2021 to unitholders of record as of the close of trading on October 4, 2021. The sale of Atlantic Aviation was part of the Company's efforts to unlock value for its unitholders. On September 21, 2021, the shareholders of MIC approved the AA Transaction at the Special Meeting and therefore the Company determined that each of the criteria to be classified as held for sale under ASC 205-20, Presentation of Financial Statements — Discontinued Operations , had been met as it relates to Atlantic Aviation. It was additionally determined that the sale of Atlantic Aviation is considered a strategic shift for the Company that will have a major effect on operations. Accordingly, Atlantic Aviation was classified as a discontinued operation and the Atlantic Aviation segment was eliminated. All prior periods have been restated to reflect these changes. The Company recognized a book gain on sale of approximately $2.95 billion as a result of the AA Transaction. The Company incurred $50.2 million in transaction costs and a disposition payment of $228.6 million to its Manager, both of which are included in Selling, general and administrative expenses in the consolidated statement of operations. A summary of assets and liabilities held for sale included in the Company's consolidated balance sheet related to the Atlantic Aviation business ("AA Business") as of December 31, 2020 are as follows ($ in thousands): As of Assets Cash and cash equivalents $ 309,955 Restricted cash 10,121 Accounts receivable, net of allowance for doubtful accounts 23,749 Other current assets 20,583 Total current assets 364,408 Property, equipment, land, and leasehold improvements, net 556,825 Operating lease assets, net 313,014 Goodwill 496,746 Intangible assets, net 452,664 Other noncurrent assets 1,345 Total assets $ 2,185,002 Liabilities Accounts payable and accrued expenses $ 45,702 Current portion of long-term debt 10,250 Operating lease liabilities - current 15,138 Income taxes payable, net 132,113 Other current liabilities 13,270 Total current liabilities 216,473 Long-term debt, net of current portion 976,190 Deferred income taxes 100,405 Operating lease liabilities - noncurrent 303,728 Other noncurrent liabilities 17,034 Total liabilities $ 1,613,830 Summarized financial information for discontinued operations included in the Company's consolidated statement of operations related to the AA Business for the years ended December 31, 2021, 2020 and 2019, respectively, are as follows ($ in thousands): Year Ended December 31, 2021 2020 2019 Service revenue $ 678,485 $ 667,070 $ 969,198 Cost of services (286,078) (238,599) (448,136) Selling, general and administrative expenses (195,677) (249,879) (263,255) Depreciation and amortization (69,792) (100,112) (106,255) Interest expense, net (32,036) (64,987) (76,856) Gain on sale of business 2,953,873 — — Other income, net 2,036 323 3,005 Net income from discontinued operations before income taxes 3,050,811 13,816 77,701 Provision for income taxes (66,458) (122,642) (26,377) Net income (loss) from discontinued operations attributable to MIH $ 2,984,353 $ (108,826) $ 51,324 IMTT Transaction On December 23, 2020, the Company completed the sale of IMTT to an affiliate of Riverstone Holdings, LLC for $2.67 billion, net of closing adjustments, and including assumed debt including accrued interest of approximately $1.11 billion. The net proceeds of $1.55 billion were used to: (i) pay a special dividend of $11.00 per unit on January 8, 2021; (ii) pay capital gains taxes in April 2021; (iii) pay transaction costs; (iv) pay a disposition payment under the Disposition Agreement, dated October 30, 2019, to its Manager; and (v) repurchase a portion of its 2.00% Convertible Senior Notes. During the quarter ended September 30, 2020, the Company determined that each of the criteria to be classified as held for sale under ASC 205-20, Presentation of Financial Statements — Discontinued Operations , had been met as it related to IMTT. It was additionally determined that the sale of IMTT was considered a strategic shift for the Company that had a major effect on operations. Accordingly, IMTT was classified as a discontinued operation and the IMTT segment was eliminated. All prior periods were restated to reflect these changes. Upon completion of the IMTT Transaction on December 23, 2020, the Company recognized a book loss on sale of approximately $25.0 million. The Company incurred $28.5 million in transaction costs and a Disposition Payment of $28.2 million to its Manager, which were included in Selling, general and administrative expenses in the consolidated statement of operations. As part of classifying IMTT as held for sale, the Company recognized an impairment of the IMTT disposal group of $750.0 million, which includes a goodwill impairment of $725.0 million, reported in discontinued operations for the quarter ended September 30, 2020. During the quarter ended September 30, 2020, the Company increased its deferred tax liability by $158.0 million as it became probable that IMTT would be sold in a taxable transaction. The increase represented the deferred tax expense on the difference between the Company's book and tax basis in its investment in IMTT. Subsequent to the close of the IMTT Transaction in December 2020, the Company reclassified the liability to current and reduced the tax to $126.2 million. The reduction primarily reflected the tax benefit of the Disposition Payment and the final determination of the tax basis of its investment in IMTT, which increased due to higher than forecasted taxable income generated prior to completion of the IMTT Transaction, as fewer assets were placed in service for tax purposes resulting in lower bonus tax depreciation during the Company’s ownership period. Summarized financial information for discontinued operations included in the Company’s consolidated statement of operations related to the IMTT segment for the years ended December 31, 2020 and 2019 are as follows ($ in thousands): Year Ended December 31, 2020 2019 Service revenue $ 488,284 $ 515,102 Cost of services (192,884) (204,146) Selling, general and administrative expenses (38,094) (33,158) Impairment (750,000) — Depreciation and amortization (102,193) (132,768) Interest expense, net (42,715) (47,930) Other (expense) income, net (1) (60,874) 1,116 Net (loss) income from discontinued operations before income taxes (698,476) 98,216 Provision for income taxes (23,777) (23,866) Net (loss) income from discontinued operations attributable to MIH $ (722,253) $ 74,350 (1) Other income, net, includes loss of approximately $69.6 million from the sale of IMTT in 2020. Renewable Businesses Sale During the fourth quarter of 2018, the Company commenced a sale process involving its portfolios of 142 megawatts ("MW") (gross) of solar generation assets and 203 MW (gross) of wind generation assets. In July 2019, the Company completed the sales of its wind power generating portfolio and all but one of the assets in its solar power generating portfolio. The sale of the remaining solar facility closed during September 2019. Upon closing of the transactions involving the portfolios of operating solar and wind assets, the Company deconsolidated $295.1 million of long-term debt. In July 2019, the Company also completed the sale of its majority interest in a renewable power development business. The Company may be entitled to a deferred purchase price from the sale of its interest in the renewable power development business based on the sale of certain projects by the purchaser in the future. The aggregate gross proceeds to the Company from the above sales were $275.2 million, or $223.8 million net of taxes and transaction related expenses. Upon closing of the transactions, the Company recorded a pre-tax gain of $81.7 million excluding any transaction costs. The Company incurred $9.7 million in professional fees in relation to these transactions, which is included in Selling, general and administrative expenses in the consolidated statement of operations. In 2019, the Company recorded approximately $41.7 million in current tax expense primarily related to the gain on sale. The combination of the disposal of Bayonne Energy Center in 2018 and the commencement of the sale process of substantially all of its portfolio of solar and wind facilities represented a strategic shift for the Company which will have a major effect on operations. Accordingly, beginning in the fourth quarter of 2018, these businesses were classified as discontinued operations and the Contracted Power segment was eliminated. There was no write-down of the carrying amount of the solar and wind facility assets as a result of this change in classification. The assets and liabilities of the solar and wind facilities have been classified as held for sale in the consolidated balance sheets up until the date those assets were disposed. During the first quarter of 2019, the Company also commenced the sale of its majority interest in its renewable power development business that was reported as part of the Company’s Corporate and Other segment in the fourth quarter of 2018. Accordingly, beginning in the first quarter of 2019, the results of this business were classified as discontinued operations and the assets and liabilities of this business were classified as held for sale in the consolidated balance sheets through the date of sale. The Company did not restate the prior period related to the commencement of the sale process involving its majority interest in a renewable power development business as the disposition was insignificant. A remaining relationship with a third-party developer of renewable power facilities had been reported as a component of Corporate and Other through the expiration of the relationship in July 2019. Summarized financial information for discontinued operations included in the Company’s consolidated statement of operations related to its former Contracted Power segment for 2019 is as follows ($ in thousands): Year ended December 31, 2019 Product revenue $ 44,411 Cost of product sales (7,389) Selling, general and administrative expenses (19,148) Depreciation and amortization (608) Interest expense, net (12,888) Other income, net (1) 81,156 Net income from discontinued operations before income taxes 85,534 Provision for income taxes (32,803) Net income from discontinued operations 52,731 Less: net loss attributable to noncontrolling interests (3,109) Net income from discontinued operations attributable to MIH $ 55,840 (1) Other income, net, includes gains of approximately $80.2 million from the sale of renewable businesses in 2019.

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	Leases The Company has operating leases primarily for land, buildings, office space, and certain office equipment under non-cancellable lease agreements. Leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet. Some leases include one or more options to renew, with renewal terms that can extend the lease term from one The Company’s operating lease expenses recorded within the consolidated statement of operations for 2021, 2020 and 2019 were as follows ($ in thousands): Income Statement Classification Year Ended December 31, 2021 2020 2019 Cost of product sales $ 2,267 $ 2,301 $ 2,295 Selling, general and administrative 244 248 240 Total operating lease expense (1) $ 2,511 $ 2,549 $ 2,535 (1) Includes expense related to leases less than one year of $105,000 for both 2021 and 2020, and $179,000 for 2019. Includes variable lease expense of $323,000, $345,000 and $330,000 in 2021, 2020 and 2019, respectively. On December 31, 2021, 2020 and 2019, the weighted-average remaining operating lease term was 10.0 years, 9.7 years and 9.8 years, respectively, with a weighted average discount rate of 5.3%, 4.8% and 4.7%, respectively. The following table represents the future maturities of lease liabilities on December 31, 2021 ($ in thousands): 2022 $ 2,350 2023 2,230 2024 1,990 2025 1,731 2026 1,672 Thereafter 6,936 Total lease payment 16,909 Less: interest (4,305) Present value of lease liability $ 12,604

Income per Unit

Income per Unit	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Income per Unit	Income per Unit Following is a reconciliation of the basic and diluted (loss) income per unit computations ($ in thousands, except unit and per unit data): Year ended December 31, 2021 2020 2019 Numerator: Basic and diluted net loss from continuing operations attributable $ (300,485) $ (96,782) $ (25,006) Basic and diluted net income (loss) from discontinued operations $ 2,984,353 $ (831,079) $ 181,514 Denominator: Weighted average number of units outstanding: basic 87,791,951 86,951,642 86,178,212 Weighted average number of units outstanding: diluted 87,791,951 86,951,642 86,178,212 Year ended December 31, 2021 2020 2019 Income per unit: Basic loss per unit from continuing operations attributable $ (3.42) $ (1.11) $ (0.29) Basic income (loss) per unit from discontinued operations 33.99 (9.56) 2.11 Basic income (loss) per unit attributable to MIH $ 30.57 $ (10.67) $ 1.82 Diluted loss per unit from continuing operations attributable $ (3.42) $ (1.11) $ (0.29) Diluted income (loss) per unit from discontinued operations 33.99 (9.56) 2.11 Diluted income (loss) per unit attributable to MIH $ 30.57 $ (10.67) $ 1.82 The following represents the weighted average potential dilutive common units that were excluded from the diluted income per unit calculation: Year ended December 31, 2021 2020 2019 Restricted unit grants 109,185 108,760 26,089 2.875% Convertible Senior Notes due July 2019 (1) — — 1,321,243 2.00% Convertible Senior Notes due October 2023 (2) 1,689,203 3,634,173 3,634,173 Total 1,798,388 3,742,933 4,981,505 (1) On July 15, 2019, the Company fully repaid the outstanding balance on the 2.875% Convertible Senior Notes due July 2019 at maturity using cash on hand. The weighted average units reflect the “if-converted” impact to dilutive common units through the maturity date of the Notes. (2) During 2021, the Company repurchased $395.7 million in aggregate principal amount of the 2.00% Convertible Senior Notes, of which $358.6 million and $26.9 million were repurchased in tender offers on March 16, 2021 and October 22, 2021, respectively. For 2021, the weighted average units reflect the “if-converted” dilutive impact to common units for the repurchased Notes for the period that the Notes were outstanding and the impact of the increase to the conversion rate following the special dividend pertaining to the IMTT Transaction and the one-time distribution pertaining to the AA Transaction paid on January 8, 2021 and October 7, 2021, respectively. See Note 9, “Long-Term Debt”, for further discussions.

Property, Equipment, Land and L

Property, Equipment, Land and Leasehold Improvements	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Property, Equipment, Land and Leasehold Improvements	Property, Equipment, Land, and Leasehold Improvements Property, equipment, land, and leasehold improvements on December 31, 2021 and 2020 consist of the following ($ in thousands): As of December 31, 2021 2020 Land $ 10,710 $ 10,710 Buildings 4,427 4,142 Leasehold and land improvements 20,003 19,824 Machinery and equipment 376,924 363,379 Furniture and fixtures 3,740 3,664 Construction in progress 11,313 11,524 427,117 413,243 Less: accumulated depreciation (129,927) (115,868) Property, equipment, land, and leasehold improvements, net $ 297,190 $ 297,375

Intangible Assets and Goodwill

Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Intangible Assets and Goodwill Intangible assets on December 31, 2021 and 2020 consist of the following ($ in thousands): As of December 31, 2021 2020 Customer relationships $ 7,400 $ 7,400 Trade names 8,500 8,500 Leasehold rights 100 100 16,000 16,000 Less: accumulated amortization (11,502) (11,077) Intangible assets, net $ 4,498 $ 4,923 On December 31, 2021, the Company had $4.5 million in trade names net of accumulated amortization related to "The Gas Company", which is being amortized over its estimated useful life. Amortization expense of intangible assets totaled $425,000 in 2021, 2020, and 2019, respectively. The estimated future amortization expense for amortizable intangible assets to be recognized are ($ in thousands): 2022 $ 425 2023 425 2024 425 2025 425 2026 425 Thereafter 2,373 Total $ 4,498 The goodwill balance on December 31, 2021 comprised the following ($ in thousands): Atlantic Aviation Hawaii Total Goodwill acquired in business combinations, net of disposals, on December 31, 2020 $ 620,599 $ 123,333 $ 743,932 Accumulated impairment charges (123,200) (3,215) (126,415) Other (653) 75 (578) Transfer to asset held for sale (496,746) — (496,746) Balance on December 31, 2020 — 120,193 120,193 Balance on December 31, 2021 $ — $ 120,193 $ 120,193 The Company tests for goodwill impairment annually on October 1 of each year and between annual tests if a triggering event indicates the possibility of an impairment. With the signing of the Merger, the Company will evaluate goodwill for impairment having regard to the Merger transaction value. See Note 1, "Organization and Description of Business" for discussions on the Merger. On December 31, 2021 and 2020, there were no new triggering events that indicated impairment.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The Company is capitalized in part using floating rate bank debt with medium-term maturities generally between four On December 31, 2021 and 2020, the Company’s consolidated long-term debt comprised of the following ($ in thousands): As of December 31, 2021 2020 Term Loan - Hawaii Gas $ 80,000 $ 180,000 Term Loan - Solar Facilities in Hawaii 12,698 13,758 2.00% Convertible Senior Notes 6,821 391,252 Total 99,519 585,010 Current portion (1,107) (1,060) Long-term portion 98,412 583,950 Unamortized debt financing costs (1) (757) (5,781) Long-term portion less unamortized debt discount and debt financing costs $ 97,655 $ 578,169 (1) The weighted average remaining life of the debt financing costs on December 31, 2021 was 2.9 years. The following table represents the future maturities of long-term debt balances on December 31, 2021 ($ in thousands). 2022 $ 1,107 2023 7,976 2024 81,204 2025 1,258 2026 7,974 Thereafter — Total $ 99,519 2.00% Convertible Senior Notes due October 2023 (2.00% Convertible Senior Notes) In October 2016, the Company completed an underwritten public offering of a seven year, $402.5 million aggregate principal amount of 2.00% Convertible Senior Notes. The Notes are convertible, at the holder’s option, only upon satisfaction of one or more conditions set forth in the indenture governing the Notes. Upon conversion, the Company will pay or deliver, as the case may be, cash, common units of the Company, or a combination thereof, at the Company’s election. The $402.5 million of 2.00% Convertible Senior Notes had an initial value of the principal amount recorded as a liability of $375.8 million, using an effective interest rate of 3.1%. The remaining $26.7 million of principal amount was allocated to the conversion feature and recorded in Common Units Paid in Capital . This amount represents a discount to the debt to be amortized through interest expense using the effective interest method through maturity. The Company also recorded $11.2 million in debt financing costs from the issuance of the 2.00% Convertible Senior Notes, of which $744,000 was recorded as equity issuance costs as a component of Unitholders’ Equity. On December 31, 2020, the outstanding balance of the liability component of the 2.00% Convertible Senior Notes was $391.3 million with a fair value of approximately $390.0 million. On January 1, 2021, the Company adopted ASU 2020-06 under the modified retrospective method. ASU 2020-06 removes the accounting for cash conversion feature of the Notes such that the Notes would only be classified as a liability. The adoption of ASU 2020-06 resulted in the reversal of the initial equity component recorded of $26.7 million and made an adjustment to the beginning balance to Retained Earnings of $7.0 million primarily for the reversal of the amortization of debt discount taken through that date, net of taxes. During 2021, the Company repurchased $395.7 million in aggregate principal amount of the 2.00% Convertible Senior Notes, of which $358.6 million and $26.9 million were repurchased in tender offers on March 16, 2021 and October 22, 2021, respectively. In connection with the repurchases, the Company incurred $1.2 million of transaction costs and wrote-off $3.7 million of debt financing costs recorded in Selling, general and administrative expenses and Interest Expense , respectively, in the consolidated statements of operations. On December 31, 2021, the outstanding balance of the liability component of the 2.00% Convertible Senior Notes was $6.8 million which approximated its fair value. The conversion rate was 162.9223 common units per $1,000 principal amount on December 31, 2021. The 2.00% Convertible Senior Notes consisted of the following ($ in thousands): As of December 31, 2021 (1) 2020 Liability Component: Principal $ 6,821 $ 402,500 Unamortized debt discount — (11,248) Long-term debt, net of unamortized debt discount 6,821 391,252 Unamortized debt financing costs — (4,134) Net carrying amount $ 6,821 $ 387,118 Equity Component $ — $ 26,748 (1) Reflects the repurchase of 2.00% Convertible Senior Notes and the adoption of ASU No. 2020-06 effective January 1, 2021. In 2021, 2020, and 2019, total interest expense recognized related to the 2.00% Convertible Senior Notes consisted of the following ($ in thousands): Year ended December 31, 2021 2020 2019 Contractual interest expense $ 2,171 $ 8,050 $ 8,050 Amortization of debt discount — 3,858 3,741 Amortization of debt financing cost 413 1,503 1,503 Write-off of debt financing cost 4,016 — — Total interest expense $ 6,600 $ 13,411 $ 13,294 The key terms of the 2.00% Convertible Senior Notes are summarized in the table below. Facility Terms 2.00% Convertible Senior Notes Amount outstanding on December 31, 2021 $6.8 million Maturity October 2023 Amortization Payable at maturity or convertible at the holder’s option into cash, the Company’s units, or a combination thereof, only upon satisfaction of one or more conditions set forth in the indenture Interest Rate 2.00% payable on April 1 st and October 1 st of each year Security Unsecured Hawaii Gas On February 10, 2016, Hawaii Gas completed the refinancing of its existing $80.0 million term loan and $60.0 million revolving credit facility. The $80.0 million term loan bears interest at a variable rate of LIBOR plus an applicable margin between 1.00% and 1.75%. The variable rate component of the debt was fixed at 0.99% using an interest rate swap contract, that expired upon maturity in February 2020. The revolving credit facility bears interest at a variable rate of LIBOR plus an applicable margin between 1.00% and 1.75% and is unhedged. In February 2018, Hawaii Gas exercised the second of two one-year extensions related to its $80.0 million secured term loan facility and its $60.0 million revolving credit facility extending their respective maturities to February 2023. During the quarter ended June 30, 2021, Hawaii Gas extended the maturity on its term loan and revolving credit facility from February 2023 to February 2024. The $60.0 million revolving credit facility was undrawn on December 31, 2021 and 2020. On December 31, 2020, Hawaii Gas also had $100.0 million of fixed rate senior notes outstanding that had a fair value of approximately $105.0 million. On April 19, 2021, Hawaii Gas fully repaid all of its $100.0 million senior secured notes outstanding and incurred a $4.7 million 'make-whole' payment and wrote-off $154,000 of debt financing costs both recorded in Interest Expense in the consolidated statement of operations . The key terms of the term loan and revolving credit facility of Hawaii Gas are summarized in the table below. Facility Terms Holding Company Debt Operating Company Debt Borrowers HGC Holdings LLC ("HGC") The Gas Company, LLC ("TGC") Facilities $80.0 million term loan (fully drawn at December 31, 2021) $60.0 million revolving credit facility (undrawn at December 31, 2021) Maturity February 2024 February 2024 Amortization Payable at maturity Revolving, payable at maturity Interest Rate LIBOR plus 1.25% on December 31, 2021 LIBOR plus 1.00% on December 31, 2021 Commitment Fees — 0.175% on the undrawn portion Collateral First lien on all assets of HGC and its subsidiaries First lien on all assets of TGC and its subsidiaries Solar Facilities In July 2016, the solar facilities in Hawaii entered into a ten year, $18.0 million amortizing term loan facility. The interest rate on this term loan facility floats at LIBOR plus 2.00%. The interest rate was fixed at 3.38% using an interest rate swap contract through June 30, 2026. On December 31, 2021 and 2020, the outstanding balance on the term loan was $12.7 million and $13.8 million, respectively.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities From time to time, the Company enters into interest rate agreements to minimize potential variations in cash flows resulting from fluctuations in interest rates and their impact on its variable-rate debt. The Company does not enter into derivative instruments for any purpose other than economic interest rate hedging. That is, the Company does not speculate using derivative instruments. In addition, Hawaii Gas enters into commodity hedge contracts to mitigate the impact of fluctuations in LPG prices on its cash flows. By using derivative financial instruments to hedge exposures to changes in interest rates, the Company exposes itself to credit risk and market risk. Credit risk is the failure of the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is positive, the counterparty owes the Company, which creates credit risk for the Company. Conversely, when the fair value of a derivative contract is negative, the Company owes the counterparty and, therefore, it does not pose a credit risk. The Company minimizes the credit risk in derivative instruments by entering into transactions with creditworthy counterparties. Market risk is the adverse effect on the value of a financial instrument that results from a change in interest rates. The market risk associated with interest rates is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken. Interest Rate Contracts The Company has in place variable-rate debt. Interest rate swaps change the variable-rate cash flow exposure on the debt obligations to fixed cash flows. Under the terms of the interest rate swaps currently in place, the Company receives variable interest rate payments and makes fixed rate interest payments, thereby creating the equivalent of fixed-rate debt for the portion of the debt that is swapped. The Company does not use hedge accounting. All movements in the fair value of the interest rate derivatives are recorded directly through earnings. Hawaii Gas had an $80.0 million interest rate swap that fully hedged its term loan. The interest rate swap expired in February 2020. To finance its solar facilities, the Company entered into a ten year, amortizing term loan facility that floats at LIBOR plus 2.00%. This term loan facility is fully hedged with an amortizing interest rate swap contract that is scheduled to amortize concurrently with the term loan and fixes the interest rate at 3.38%. Commodity Price Hedges The risks associated with fluctuations in the prices that Hawaii Gas pays for LPG is principally a result of market forces reflecting changes in supply and demand. Hawaii Gas’ gross margin (revenue less cost of product sales excluding depreciation and amortization) is sensitive to changes in LPG supply costs and Hawaii Gas may not always be able to pass through cost increases fully or on a timely basis, particularly when product costs rise rapidly. To reduce its exposure to the volatility of the business’ LPG wholesale market price, Hawaii Gas has used and expects to continue to use over-the-counter commodity derivative instruments. Hawaii Gas does not use commodity derivative instruments for speculative or trading purposes. Over-the-counter derivative instruments used by Hawaii Gas to hedge a portion of forecasted purchases of LPG are generally settled at expiration of the contract. On December 31, 2021, Hawaii Gas had 60.7 million gallons of LPG hedged through May 2024. Financial Statement Location Disclosure for Derivative Instruments The Company measures derivative instruments at fair value using the income approach which discounts the future net cash settlements expected under the derivative contracts to a present value. These valuations use primarily observable (level 2) inputs, including contractual terms, interest rates, and yield curves observable at commonly quoted intervals. The Company’s fair value measurements of its derivative instruments and the related location of the assets and liabilities within the consolidated balance sheets on December 31, 2021 and 2020 were ($ in thousands): Balance Sheet Classification Assets (Liabilities) at Fair Value as of December 31, 2021 2020 Fair value of derivative instruments - other current assets $ 909 $ 935 Fair value of derivative instruments - other noncurrent assets 470 — Total derivative contracts - assets $ 1,379 $ 935 Fair value of derivative instruments - other current liabilities $ (122) $ (172) Fair value of derivative instruments - other noncurrent liabilities — (449) Total derivative contracts - liabilities $ (122) $ (621) The Company’s hedging activities during 2021, 2020, and 2019 and its related location within the consolidated statement of operations were ($ in thousands): Income Statement Classification Gain (Loss) Recognized for the Year ended December 31, 2021 2020 2019 Interest expense – interest rate swaps $ 333 $ (912) $ (875) Cost of product sales – commodity swaps 5,946 883 (10,082) Total $ 6,279 $ (29) $ (10,957) All of the Company’s derivative instruments are collateralized by the assets of the respective businesses.

Unitholders_ Equity

Unitholders’ Equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Unitholders’ Equity	Unitholders’ Equity Classes of Equity The Company is authorized to issue (i) 500,000,000 common units, (ii) 100 special units, and (iii) 100,000,000 preferred units. On December 31, 2021, the Company had 88,343,762 common units issued and outstanding and 100 special units issued to its Manager and outstanding. There was no preferred units issued or outstanding on December 31, 2021. Each outstanding common unit of the Company is entitled to one vote on any matter with respect to which holders of units are entitled to vote. The sole purpose for the special units was to preserve the Manager’s right to appoint one director to serve as the chairman of the Board. The special units is not listed on any stock exchange and is non-transferable. Holders of special units are not entitled to any dividends or to share in any distribution of assets upon the liquidation or dissolution of the Company. Distributions The Company’s Board have made or declared the following distributions during 2021, 2020, and 2019: Declared Period $ Record Payable September 23, 2021 (1) $ 37.386817 October 4, 2021 October 7, 2021 December 23, 2020 (2) 11.00 January 5, 2021 January 8, 2021 February 14, 2020 Fourth quarter 2019 1.00 March 6, 2020 March 11, 2020 October 29, 2019 Third quarter 2019 1.00 November 11, 2019 November 14, 2019 July 30, 2019 Second quarter 2019 1.00 August 12, 2019 August 15, 2019 April 29, 2019 First quarter 2019 1.00 May 13, 2019 May 16, 2019 February 14, 2019 Fourth quarter 2018 1.00 March 4, 2019 March 7, 2019 (1) One-time distribution declared and paid out of the proceeds from the AA Transaction. Units of MIH traded with "due bills" attached through October 7, 2021 and traded ex-distribution on October 8, 2021. (2) Special dividend declared and paid out of the proceeds from the IMTT Transaction. Units of MIH traded with “due-bills” attached through January 8, 2021 and traded ex-dividend on January 11, 2021. As a result of the completion of and distribution of certain proceeds from the AA Transaction in September 2021 and the signing of the Merger in June 2021, the Company does not expect to pay further distributions. The distributions paid have been recorded as a reduction to Common Units Paid in Capital in the unitholders’ equity section of the consolidated balance sheets. The one-time distribution declared and paid out of the proceeds from the AA Transaction was recorded as a reduction to Retained Earnings in the unitholders' equity section of the consolidated balance sheets. 2014 Independent Directors Equity Plan ("2014 Plan") In 2014, MIC adopted, and MIC’s stockholders approved, the 2014 Plan to replace the 2004 Independent Directors Equity Plan, which expired in December 2014. The purpose of this plan is to promote the long-term growth and financial success of the Company by attracting, motivating, and retaining independent directors of outstanding ability. Only the Company’s independent directors may participate in the 2014 Plan. The only type of award that may be granted under the 2014 Plan is an award of director shares. Each share is an unsecured promise to transfer one share on the settlement date, subject to satisfaction of the applicable terms and conditions. During the quarter ended June 30, 2021, the number of units available under the 2014 Plan was increased by 70,668 in accordance with the terms of the Plan as a result of the special dividend paid in connection with the IMTT Transaction. The maximum number of units available for issuance under the 2014 Plan is 370,668 units, of which 227,832 units remained available for issuance on December 31, 2021. Subsequent to December 31, 2021, the number of units available under the 2014 Plan was increased to 2,481,999 in accordance with the terms of the Plan as a result of the one-time distribution paid in connection with the AA Transaction. The aggregate grant date fair value of awards granted to an independent director during any single fiscal year (excluding awards made at the election of the independent director in lieu of all or a portion of annual and committee cash retainers) may not exceed $350,000. The 2014 Plan does not provide a formula for the determination of awards and the Compensation Committee will have the authority to determine the size of all awards under the 2014 Plan, subject to the limits on the number of director share units that may be granted annually. Since 2019, the Company has granted and issued the following stock to the Board under the 2014 Plan: Date of Units Grant Date Fair Value Date of May 15, 2019 21,390 $ 42.01 May 13, 2020 May 14, 2020 32,112 27.43 May 11, 2021 March 9, 2021 (1) 12,024 30.48 May 11, 2021 May 19, 2021 25,974 34.90 September 23, 2021 (2) (1) Represents additional restricted stock unit grants to independent directors to preserve the economic value of the unvested grants after giving effect to the special dividend made in connection with the IMTT Transaction. (2) These director share units fully vested as a result of the AA Transaction, which constituted a change in control as defined in the 2014 Plan. Compensation expense related to the director share units was $1.3 million, $880,000, and $963,000 in 2021, 2020 and 2019, respectively. 2016 Omnibus Employee Incentive Plan ("2016 Plan") On May 18, 2016, the Company adopted the 2016 Plan. The 2016 Plan provides for the issuance of equity awards to attract, retain, and motivate employees, consultants, and others who perform services for the Company and its subsidiaries. Under the 2016 Plan, the Compensation Committee determines the persons who will receive awards, the time at which they are granted, and the terms of the awards. Type of awards include stock options, stock appreciation rights, restricted stock, restricted stock units, dividend equivalent rights, cash-based awards, and other stock-based awards. Common units underlying forfeited awards are available for future grants. On March 28, 2019, the Company’s Board adopted Amendment No. 1 to the 2016 Plan (the "Amendment"), which was approved in May 2019 by the Company’s unitholders at the 2019 Annual Meeting of Shareholders. The Amendment, among other things, increased the number of common units available for grant under the 2016 Plan from 500,000 to 1,500,000. Subsequent to December 31, 2021, the number of units available increased to 19,259,340 in accordance with the term of the 2016 Plan as a result of the special dividend paid in connection with the IMTT Transaction and the one-time distribution in connection with the AA Transaction. In connection with the reorganization, MIH assumed all obligations under MIC’s stock incentive plans. All rights of participants to acquire shares of common stock of MIC under the stock incentive plans converted into rights to acquire common units of MIH in accordance with the terms of the Stock Incentive Plans. Short-Term Incentive Plan ("STIP") for MIH Operating Businesses — Restricted Stock Units ("RSUs") During the quarter ended March 31, 2019, the Company established the STIP to provide cash and stock-based incentives to eligible employees of its operating businesses under the Company’s 2016 Plan. In general, the cash component comprises approximately 75% of any incentive award and is paid in a lump-sum. The remaining 25% of any incentive award is in the form of RSUs representing an interest in the common units of the Company. RSUs are granted following assessment of performance against Key Performance Indicators post the one-year performance period and vest in two equal annual installments following the grant date. The following represents unvested STIP RSU grants through December 31, 2021: STIP Grants Number of RSUs Weighted Average Grant-Date Fair Value Unvested balance on December 31, 2019 — $ — Granted 55,661 24.50 Forfeited (1,468) 24.50 Vested (1) (19,566) 32.57 Unvested balance on December 31, 2020 34,627 $ 24.50 Granted (2) 286,013 4.89 Forfeited (215) 24.92 Vested (3) (68,776) 31.03 Unvested balance on December 31, 2021 251,649 $ 2.49 (1) As a result of the IMTT Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the STIP RSU grants for eligible employees of IMTT. (2) During the quarter ended March 31, 2021, the Company granted an additional 12,614 RSUs to preserve the economic value of the unvested RSUs after giving effect to the special dividend made in connection with the IMTT Transaction. During the quarter ended December 31, 2021, the Company granted an additional 228,943 RSUs to preserve the economic value of the unvested RSUs after giving effect to the one-time distribution made in connection with the AA Transaction. (3) As a result of the AA Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the STIP RSU grants for eligible employees of Atlantic Aviation and MIC Global Services ("MGS"). These RSUs were fully vested on September 23, 2021. On December 31, 2021, the grant date fair value of the unvested awards was $628,000, and is expected to be recognized over a weighted-average period of 1.0 year. Compensation expense related to the STIP RSUs was $2.1 million and $1.1 million for 2021 and 2020, respectively (which includes the former eligible participants of IMTT, Atlantic Aviation, and MGS). No compensation expense related to the STIP RSUs was recorded in 2019. As a result of the IMTT Transaction, the Company's Compensation Committee and Board of Directors approved an accelerated vesting of STIP RSU grants relating to former eligible employees of IMTT. These RSUs were fully vested in common units on December 23, 2020. This acceleration changed the terms of the vesting conditions and are therefore treated as modifications in accordance with ASC 718, Stock Based Compensation. This resulted in $398,000 of additional compensation expense recorded in discontinued operations during 2020. As a result of the AA Transaction, the Company's Compensation Committee and Board of Directors approved an accelerated vesting of STIP RSU grants relating to former eligible employees of Atlantic Aviation and MGS. These RSUs were fully vested in common units on September 23, 2021. This acceleration changed the terms of the vesting conditions and are therefore treated as modifications in accordance with ASC 718, Stock Based Compensation. This resulted in $965,000 of additional compensation expense recorded in discontinued operations during 2021. From time to time, the Company can issue RSUs to award or retain employees, or to attract new employees, or other reasons by providing special grants of RSUs. Vesting dates and terms can vary for each award at the discretion of the Company. The following represents unvested Special RSUs granted through December 31, 2021: Special RSU Grants Number of RSUs Weighted Average Grant-Date Fair Value Unvested balance on December 31, 2019 6,067 $ 40.30 Granted 4,602 23.50 Vested (5,702) 26.74 Unvested balance on December 31, 2020 4,967 $ 40.30 Granted (1) 1,860 — Vested (6,827) 29.32 Unvested balance on December 31, 2021 — $ — (1) During the quarter ended March 31, 2021, the Company granted an additional 1,860 RSUs to preserve the economic value of the unvested RSUs after giving effect to the special dividend made in connection with the IMTT Transaction. Compensation expense related to the Special RSU grants was $200,000, $152,000, and insignificant for 2021, 2020, and 2019, respectively. Long-Term Incentive Plan ("LTIP") for MIH Operating Businesses — Performance Stock Units ("PSUs") During the quarter ended March 31, 2019, the Company established the LTIP pursuant to which it may make stock-based incentive awards to eligible employees of its operating businesses. The awards would take the form of PSUs convertible into common units of the Company as authorized under its 2016 Plan. The number of PSUs a participant may be awarded reflects a target level of performance by the participant. The participant may be awarded more (over performance limit) or less (threshold limit) than the target number of PSUs based on their achievements relative to Key Performance Indicators during the three-year performance period. Following finalization of the participant’s performance review at the end of the third year of the program, the Company may award the PSUs. The following represents unvested LTIP grants through December 31, 2021 at the target level of performance: LTIP Grants (at Target) Number of PSUs Weighted Average Grant-Date Fair Value Unvested balance on December 31, 2019 125,194 $ 39.62 Forfeited (18,965) 39.70 Vested (1) (34,708) 39.88 Unvested balance on December 31, 2020 71,521 $ 39.47 Granted (2) 1,205,242 5.73 Forfeited (3) (86,384) 31.39 Vested (3) (135,493) 37.93 Unvested balance on December 31, 2021 1,054,886 $ 2.76 (1) As a result of the IMTT Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the LTIP PSU grants for former eligible employees of IMTT. (2) During the quarter ended March 31, 2021, the Company granted an additional 26,004 PSUs to preserve the economic value of the unvested PSUs after giving effect to the special dividend made in connection with the IMTT Transaction. During the quarter ended December 31, 2021, the Company granted an additional 959,700 PSUs to preserve the economic value of the unvested PSUs after giving effect to the one-time distribution made in connection with the AA Transaction. (3) As a result of the AA Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the LTIP PSU grants for former eligible employees of Atlantic Aviation and MGS. These PSUs were fully vested on September 23, 2021. On December 31, 2021, depending upon actual performance, the number of PSUs to be issued will vary from zero to 1,846,051, net of forfeitures. On December 31, 2021, the grant date fair value of the unvested awards was $2.9 million, reflecting target performance by all participants. In 2021, 2020, and 2019, the Company recognized $5.7 million, $2.1 million and $911,000 (which includes the former eligible participants of IMTT, Atlantic Aviation, and MGS), respectively, of compensation expense related to the LTIP. On December 31, 2021, the unrecognized compensation cost related to unvested PSU awards was approximately $1.3 million at target level performance. If target level performance is achieved, the unrecognized cost is expected to be recognized over a weighted-average period of 1.4 years. As a result of the IMTT Transaction, the Company's Compensation Committee and Board of Directors approved an accelerated vesting of LTIP PSU grants relating to former eligible employees of IMTT. These PSUs were vested prorated in shares on December 23, 2020. This acceleration changed the terms of the vesting conditions and are therefore treated as modifications in accordance with ASC 718 . As a result, the participants forfeited 13,549 shares and decreased future compensation expense by $540,000. As a result of the AA Transaction, the Company's Compensation Committee and Board of Directors approved an accelerated vesting of LTIP PSU grants relating to former eligible employees of Atlantic Aviation and MGS. These PSUs were fully vested in common units on September 23, 2021. This acceleration changed the terms of the vesting conditions and are therefore treated as modifications in accordance with ASC 718, Stock Based Compensation. As a result, the participants forfeited 85,962 shares and decreased future compensation expense by $1.7 million. Accumulated Other Comprehensive Loss, net of taxes The following represents the changes and balances to the components of accumulated other comprehensive loss, net of taxes, during 2021, 2020, and 2019 ($ in thousands): Post-Retirement Benefit Plans, net of taxes (1) Translation Adjustment, net of taxes (2) Total Balance on December 31, 2018 $ (15,622) $ (14,649) $ (30,271) Change in post retirement benefit plans (8,533) — (8,533) Translation adjustment — 1,932 1,932 Balance on December 31, 2019 $ (24,155) $ (12,717) $ (36,872) Change in post-retirement benefit plans (15,723) — (15,723) Translation adjustment — 1,141 1,141 Reclassification to net income (loss) due to sale of business (3) 33,703 11,576 45,279 Balance on December 31, 2020 $ (6,175) $ — $ (6,175) Change in post-retirement benefit plans 1,075 — 1,075 Reclassification to net income (loss) due to sale of business (3) (6) — (6) Balance on December 31, 2021 $ (5,106) $ — $ (5,106) (1) Change in post-retirement benefit plans is presented net of tax benefit of $375,000, $6.1 million, and $3.4 million in 2021, 2020 and 2019, respectively. (2) Translation adjustment is presented net of tax expense of $444,000 and $751,000 in 2020 and 2019, respectively.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company's business comprises: (i) Hawaii Gas, Hawaii’s only government-franchised gas utility and an unregulated LPG distribution business providing gas and related services to industrial, commercial, residential, and governmental customers; (ii) controlling interests in two solar facilities on Oahu, and (iii) smaller projects collectively engaged in efforts to reduce the cost and improve the reliability and sustainability of energy in Hawaii. Revenue from Hawaii Gas is generated from the distribution and sales of synthetic natural gas ("SNG"), LPG, liquefied natural gas ("LNG"), and renewable natural gas ("RNG"). Revenue is primarily a function of the amount of product consumed by customers and the price per British Thermal Unit or gallon charged to customers. Revenue levels, without organic growth, will generally track global commodity prices, namely petroleum and natural gas, as its products are derived from these commodities. Revenue from Hawaii Gas is recorded in product revenue. Hawaii Gas recognizes revenue when products are delivered. Sales of gas to customers are billed on a monthly-cycle basis. Earned but unbilled revenue is accrued and included in accounts receivable and revenue. This is based on the amount of gas that has been delivered but not billed to customers from the latest meter reading or billed delivery date to the end of an accounting period. The related costs are charged to expense. The renewables projects in Hawaii sell substantially all of the electricity generated at a fixed price to primarily electric utility customers pursuant to long-term power purchase agreements ("PPAs") of 20 years. The PPAs are accounted for as operating leases and have no minimum lease payments. Lease income is recorded within product revenue when the electricity is delivered. Revenues from external customers were ($ in thousands): Year Ended December 31, 2021 2020 2019 Product revenue Lease $ 4,726 $ 3,355 $ 5,139 Gas 220,564 162,926 225,618 Other 10,694 14,130 11,880 Total revenue $ 235,984 $ 180,411 $ 242,637

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Management Services On December 31, 2021 and 2020, the Manager held 14,719,423 units and 13,954,821 units, respectively, of the Company’s common units. Pursuant to the terms of the Fourth Amended and Restated Management Agreement ("MSA"), the Manager may sell these units at any time. Under the MSA, the Manager, at its option, may reinvest base management fees and performance fees, if any, in units of the Company. The Manager’s holdings on December 31, 2021 represented 16.66% of the Company's outstanding common units. Since January 1, 2019, the Company paid the Manager cash dividends and/or distributions on units held for the following periods: Declared Period $ Record Payable Cash Paid to September 23, 2021 (1) $ 37.386817 October 4, 2021 October 7, 2021 $ 544,841 December 23, 2020 (2) 11.00 January 5, 2021 January 8, 2021 153,503 February 14, 2020 Fourth quarter 2019 1.00 March 6, 2020 March 11, 2020 13,396 October 29, 2019 Third quarter 2019 1.00 November 11, 2019 November 14, 2019 13,116 July 30, 2019 Second quarter 2019 1.00 August 12, 2019 August 15, 2019 12,914 April 29, 2019 First quarter 2019 1.00 May 13, 2019 May 16, 2019 12,722 February 14, 2019 Fourth quarter 2018 1.00 March 4, 2019 March 7, 2019 12,598 (1) One-time distribution declared and paid out of the proceeds from the AA Transaction. Units of MIH traded with "due bills" attached through October 7, 2021 and traded ex-distribution on October 8, 2021. (2) Special dividend declared and paid out of the proceeds from the IMTT Transaction. Units of MIH traded with “due-bills” attached through January 8, 2021 and traded ex-dividend on January 11, 2021. Under the MSA, subject to the oversight and supervision of the Company’s Board, the Manager is responsible for and oversees the management of the Company’s business. In addition, the Manager has the right to appoint the Chairman of the Board, subject to minimum equity ownership, and to assign, or second, to the Company, two of its employees to serve as chief executive officer and chief financial officer of the Company and seconds or makes other personnel available as required. In accordance with the MSA, the Manager is entitled to a monthly base management fee based primarily on the Company’s market capitalization, and potentially a quarterly performance fee based on total unitholder returns relative to a U.S. utilities index. Currently, the Manager has elected to reinvest future base management fees and performance fees, if any, in additional units. In 2021, 2020, and 2019, the Company incurred base management fees of $21.9 million, $21.1 million, and $32.1 million, respectively. The Company did not incur any performance fees in 2021, 2020, and 2019. Effective November 1, 2018, the Manager waived two portions of the base management fee to which it was entitled under the terms of the MSA. In effect, the waivers cap the base management fee at 1% of the Company’s equity market capitalization less any cash balances at the holding company. The waiver applies only to the calculation of the base management fees and not to the remainder of the MSA. The Manager reserves the right to revoke the waivers and revert to the prior terms of the MSA, subject to providing the Company with not less than a one year notice. A revocation of the waiver would not trigger a recapture of previously waived fees. As part of the Disposition Agreement entered into between the Company and its Manager, discussed below, the Manager has agreed not to revoke the waiver during the term of the Disposition Agreement. The amendment to the Disposition Agreement, described below, provides for the payment of the waived fees upon the consummation of the Merger. Disposition Agreement To facilitate the Company’s pursuit of strategic alternatives, the Company announced that it has entered into a Disposition Agreement with its Manager on October 30, 2019 (see Exhibit 10.3 of this Form 10-K). Outside of the Disposition Agreement, the Company has limited ability to terminate the Management Services Agreement. The Disposition Agreement provides for the termination of the Company’s external management relationship with its Manager as to any businesses, or substantial portions thereof, that are sold (including if the Company itself is sold). In connection therewith, the Company will make a payment to its Manager of approximately 2.9% to 6.1% of the net proceeds generated in the event of such sales, subject to a minimum amount of payments for all sales in the aggregate in the event of a Qualifying Termination Event ("QTE") of (i) $50.0 million plus (ii) 1.5% multiplied by proceeds in excess of $500.0 million in the aggregate. A ‘‘QTE’’ means (i) the sale of the Company or (ii) a transaction or series of transactions resulting in a third party or parties acquiring all the assets of the Company. The Disposition Agreement provides that the Management Services Agreement will terminate upon the occurrence of a QTE or upon mutual agreement of the parties. If the Management Services Agreement has not been terminated prior to the sixth anniversary of the Disposition Agreement, its Manager and its independent directors will engage in reasonable, good faith discussions regarding a potential internalization or other framework for a termination of the MSA. The Disposition Agreement provides that if a QTE occurs on or prior to January 1, 2022 (subject to extension under certain circumstances for up to six months thereafter), then the Company will pay its Manager an additional payment of $25.0 million. The Disposition Agreement further provides that its Manager will receive a make-whole payment following a QTE, to the extent that the aggregate management fees paid to its Manager through the date of the QTE were less than (i) $20.0 million per year for the two years following the date of the Disposition Agreement and (ii) $10.0 million per year for any period thereafter. In addition, following a QTE, the Manager will be paid in cash all accrued and unpaid management fees, including fees of $8.5 million waived in accordance with the Limited Waiver, which waived fees would have been payable through October 31, 2019. The Manager has agreed not to exercise its right to retract the Limited Waiver for periods after October 31, 2019 and prior to the termination of the Disposition Agreement. The Disposition Agreement will terminate on the earlier to occur of (i) the termination of the Management Services Agreement and (ii) the sixth anniversary of the Disposition Agreement, subject to extension under certain circumstances if a transaction is pending. In connection with the IMTT Transaction and pursuant to the Disposition Agreement, as amended by the Amendment noted above, the Company deposited a disposition payment of $28.2 million to its Manager in an escrow account in December 2020 and subsequently released the payment from escrow in March 2021. In connection with the execution of the Merger, and in order to provide AMF Parent with the fixed amount of the Disposition Payment (as defined in the Disposition Agreement) payable to the Manager with respect to the Merger, on June 14, 2021, the Company and the Manager entered into an amendment (the "Amendment") to the Disposition Agreement. The Amendment provides that the Disposition Payment payable to the Manager with respect to the Merger will be $56.7 million (which amount includes the waived fees pursuant to the Manager's limited waiver described above). These amounts were calculated in accordance with the Disposition Agreement dated as of October 30, 2019 (assuming a March 31, 2022 closing date), do not include the $25.0 million additional payment to the Manager if the final sale of the Company occurs on or prior to July 1, 2022. The Amendment also provides that the Disposition Payments with respect to the Merger will be paid concurrently with the relevant transaction closing, and that the Company’s MSA with the Manager will terminate concurrent with the closing of the Merger and payment of all amounts payable to the Manager under the Disposition Agreement. In connection with the AA Transaction and pursuant to the Disposition Agreement, the Company paid the Manager $228.6 million in September 2021 concurrent with the closing of the transaction. The unpaid portion of the base management fees and performance fees, if any, at the end of each reporting period is included in Due to Manager-related party in the consolidated balance sheets. The following table shows the Manager’s reinvestment of its base management fees and performance fees, if any, in units: Period Base Management Performance Units 2021 Activities: Fourth quarter 2021 $ 1,056 $ — 217,273 (1) Third quarter 2021 7,698 — 195,556 Second quarter 2021 7,551 — 214,040 First quarter 2021 5,552 — 176,296 2020 Activities: Fourth quarter 2020 $ 4,903 $ — 162,791 Third quarter 2020 4,980 — 172,976 Second quarter 2020 3,824 — 146,452 First quarter 2020 7,356 — 181,617 2019 Activities: Fourth quarter 2019 $ 8,712 $ — 208,881 Third quarter 2019 7,987 — 201,827 Second quarter 2019 7,876 — 192,103 First quarter 2019 7,528 — 184,448 (1) The Manager elected to reinvest all of the monthly base management fees for the quarter ended December 31, 2021 in new primary units. The Company issued 217,273 units for the quarter ended December 31, 2021, including 72,323 units that were issued in January 2022 for the December 2021 monthly base management fee. The Manager is not entitled to any other compensation and all costs incurred by the Manager, including compensation of seconded staff, are paid by the Manager out of its base management fee. However, the Company is responsible for other direct costs including, but not limited to, expenses incurred in the administration or management of the Company and its subsidiaries, income taxes, audit and legal fees, acquisitions and dispositions, and its compliance with applicable laws and regulations. The Manager charged the Company $5,000, $314,000 and $810,000 in the years 2021, 2020, and 2019, respectively, for reimbursement of out-of-pocket expenses. The unpaid portion of the out-of-pocket expenses at the end of the reporting period is included in Due to Manager-related party in the consolidated balance sheets. In 2021, the Company paid $38,000 in legal fees incurred by the Manager related to the MIC Shareholder Litigation. The payment reflects a credit of $30,000 of legal fees incurred by the Manager in 2020. During 2020 and 2019, the Company also incurred $60,000 and $294,000, respectively, in legal fees incurred by the Manager related to certain MIC shareholder litigation. Macquarie Group - Other Services The Company uses the resources of the Macquarie Group with respect to a range of advisory, procurement, insurance, hedging, lending, and other services. Engagements involving members of the Macquarie Group are reviewed and approved by the Audit Committee of the Company’s Board. Macquarie Group affiliates are engaged on an arm’s length basis and frequently as a member of syndicate of providers whose other members establish the terms of the interaction. Advisory Services The Macquarie Group, and wholly-owned subsidiaries within the Macquarie Group, including Macquarie Bank Limited ("MBL") and Macquarie Capital (USA) Inc. ("MCUSA"), have provided various advisory and other services and incurred expenses in connection with the Company’s equity raising activities, acquisitions, and debt structuring for the Company and its businesses. Underwriting fees are recorded in unitholders’ equity as a direct cost of equity offerings. Advisory fees and out-of- pocket expenses relating to acquisitions are expensed as incurred. Debt arranging fees are deferred and amortized over the term of the credit facility. Long-Term Debt The Company had a $600.0 million senior secured revolving credit facility at the holding company level to which Macquarie Capital Funding LLC had a $40.0 million commitment. On January 19, 2021, the commitments on the senior secured revolving credit facility were terminated in accordance with the terms of that agreement. The Company incurred $8,000, $648,000, and $155,000 in interest expense related to Macquarie Capital Funding LLC’s portion of the senior secured revolving credit facility in 2021, 2020, and 2019, respectively. All outstanding balances were repaid as of December 31, 2020. Other Related Party Transactions In 2020 and 2019, the Company incurred $25,000 and $125,000, respectively, for advisory services from a former independent Board member.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes MIH is a limited liability company treated as a partnership for income tax purposes. As such, MIH is not subject to federal or state income taxes. The intermediate holding company will file a consolidated federal income tax return that includes the financial results of its Hawaii businesses. In addition, the intermediate holding company files a combined state return in Hawaii. The Company’s income tax (benefit) provision related to the income from continuing operations in 2021, 2020, and 2019 were ($ in thousands): Year Ended December 31, 2021 2020 2019 Current taxes: Federal $ (5,578) $ 804 $ 4,590 State 363 (3) (1,061) Total current tax (benefit) provision (5,215) 801 3,529 Deferred taxes: Federal 1,094 1,523 (10,281) State (3,706) 1,853 (4,888) Total deferred tax (benefit) provision (2,612) 3,376 (15,169) Total tax (benefit) provision $ (7,827) $ 4,177 $ (11,640) The following represents the tax impact of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities from continuing operations on December 31, 2021 and 2020 ($ in thousands): As of December 31, 2021 2020 Deferred tax assets: Net operating loss carryforwards $ — $ 11,201 Deferred revenue 32 34 Accrued compensation 2,257 1,918 Accrued expense 338 316 Intangible assets 3,654 3,432 Other 2,919 3,796 Net deferred tax assets 9,200 20,697 Deferred tax liabilities: Investment basis difference (414) (414) Property and equipment (46,536) (45,995) Unrealized gain on derivative instruments, net (358) (244) Prepaid expenses and other (432) (497) Total deferred tax liabilities (47,740) (47,150) Net deferred tax liabilities $ (38,540) $ (26,453) In assessing the need for a valuation allowance, the Company considers whether it is more likely than not that some portion of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. The Company considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. In 2021, there was no valuation allowance. On December 31, 2021, the Company had $38.5 million in noncurrent deferred tax liabilities from continuing operations. A significant portion of the Company’s deferred tax liabilities relates to tax basis temporary differences of both intangible assets and property and equipment. The Company records the acquisitions of consolidated businesses under the purchase method of accounting and accordingly recognizes a significant increase to the value of the property and equipment and to intangible assets. For tax purposes, the Company may assume the existing tax basis of the acquired businesses, in which case the Company records a deferred tax liability to reflect the increase in the purchase accounting basis of the assets acquired over the carryover income tax basis. This liability will reduce in future periods as these temporary differences reverse. In 2021 and 2019, the Company recorded a total tax benefit of $7.8 million and $11.6 million, respectively, from continuing operations. In 2020, the Company recorded a total tax provision of $4.2 million from continuing operations. These amounts are different from the amounts computed by applying the U.S. federal income tax rate for the period to pre-tax income as a result of the following ($ in thousands): Year Ended December 31, 2021 2020 2019 Tax benefit at U.S. statutory rate $ (64,705) $ (19,418) $ (7,747) Permanent differences and other 10,980 21,565 853 State income taxes, net of federal benefit (2,641) 1,463 (4,705) Income attributable to noncontrolling interest 95 95 (41) Partnership expenses, not subject to tax 48,444 — — Change in investment and foreign tax credits — 472 — Total tax (benefit) provision $ (7,827) $ 4,177 $ (11,640) Uncertain Tax Positions There were no uncertain tax positions on December 31, 2021 and 2020. The Company does not expect that the amount of unrecognized tax benefits will change in the next 12 months. The Company recognizes interest and penalties related to unrecognized tax benefits in Provision for Income Taxes in the consolidated statements of operations. The federal statute of limitations on the assessment of additional income tax liabilities has lapsed for all returns filed on or before December 31, 2018. The various state statutes of limitations on the assessment of additional income taxes have lapsed on all returns filed on or before December 31, 2017.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Payment for Pension and Other Postretirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Savings Plan Hawaii Gas, IMTT and Atlantic Aviation each have a defined contribution plan under Section 401(k) of the Internal Revenue Code, allowing eligible employees to contribute a percentage of their annual compensation up to an annual amount as set by the IRS. The employer contribution of eligible compensation to these plans ranges from 0% to 6% for Hawaii Gas and 0% to 7% for discontinued operations. Employer contributions for Hawaii Gas were $927,000, $907,000 and $910,000 in 2021, 2020 and 2019, respectively. Employer contributions for discontinued operations were $1.7 million, $4.7 million, and $4.5 million in 2021, 2020, and 2019, respectively. For additional information, see Note 4, "Discontinued Operations and Dispositions", for further discussions. Hawaii Gas Union Pension Plan Hawaii Gas has a defined benefit pension plan for Classified Employees of GASCO, Inc. ("HG DB Plan") that accrues benefits pursuant to the terms of a collective-bargaining agreement. The plan was frozen to new participants in 2008 in connection with an agreement to increase participant benefits over a three year period after which there will be no further increases to the flat rate as described herein. The HG DB Plan is non-contributory and covers all bargaining unit employees who have met certain service and age requirements. The benefits are based on a flat rate per year of service through the date of employment termination or retirement. Future contributions will be made to meet ERISA funding requirements. The HG DB Plan’s trustee handles the plan assets and, as an investment manager, invests them in a diversified portfolio of primarily equity and fixed-income securities. IMTT DB Plan Except for a plan covering certain employees covered by a collective-bargaining agreement at IMTT-Illinois (see below), substantially all employees of IMTT are eligible to participate in a defined benefit pension plan ("IMTT DB Plan"). Benefits under the IMTT DB Plan are based on years of service and the employees’ highest average compensation for a consecutive five year period. IMTT’s contributions to the plan are based on the recommendations of its consulting actuary. On January 1, 2017, the IMTT DB Plan was frozen to new participants, except for the union employees of Bayonne, for whom it was subsequently frozen on January 1, 2018. On December 23, 2020, the IMTT DB Plan was sold in connection with the IMTT Transaction and was assumed by the buyer. See Note 4, "Discontinued Operations and Dispositions”, for further discussions. Other Plan Benefits Hawaii Gas, IMTT and Atlantic Aviation have other insignificant plans that are comprised of the following. These plans are shown below collectively as “Other Plan Benefits” . Hawaii Gas Hawaii Gas has a postretirement plan. The GASCO, Inc. Hourly Postretirement Medical and Life Insurance Plan (the "PMLI Plan") covers all bargaining unit participants who were employed by Hawaii Gas on April 30, 1999 and who retire after the attainment of age 62 with 15 years of service. Under the provisions of the PMLI Plan, Hawaii Gas pays for medical premiums of the retirees and spouses through the age of 64. After age 64, Hawaii Gas pays for medical premiums up to a maximum of $150 per month. The retirees are also provided $1,000 of life insurance benefits. Hawaii Gas also has a retiree life insurance program for certain nonunion retirees. This plan is closed to future participants. IMTT IMTT is the sponsor of a defined benefit plan covering union employees at IMTT-Illinois ("IMTT-Illinois Union Plan"). Monthly benefits under this plan are computed based on a benefit rate in effect at the date of the participant’s termination multiplied by the number of years of service. IMTT’s contributions to the plan are based on the recommendations of its consulting actuary. On January 1, 2018, the IMTT-Illinois Union Plan was frozen to new participants. IMTT provides post-retirement life insurance (coverage equal to 25% of final year compensation not to exceed $25,000) and health benefits (coverage for early retirees at least 62 years old on early retirement to age 65, reimbursement of Medicare premiums for the Bayonne terminal employees and some smaller health benefits no longer offered) to retired employees. On December 23, 2020, the IMTT-Illinois Union Plan and the post-retirement life insurance plan was sold in connection with the IMTT Transaction and was assumed by the buyer. See Note 4, "Discontinued Operations and Dispositions”, for further discussions. Atlantic Aviation Atlantic Aviation sponsors a retiree medical and life insurance plan available to certain employees. Currently, the plan is funded as required to pay benefits and the plan has no assets. The Company accounts for postretirement healthcare and life insurance benefits in accordance with ASC 715, Compensation — Retirement Benefits , which requires the accrual of the cost of providing postretirement benefits during the active service period of the employee. On September 23, 2021, the Atlantic Aviation retiree medical and life insurance plan was sold in connection with the AA Transaction and was assumed by the buyer. See Note 4, "Discontinued Operations and Dispositions", for further discussions. Additional information about the fair value of the benefit plan assets, the components of net periodic cost, and the projected benefit obligation as of and during 2021 and 2020 are ($ in thousands). HG DB IMTT DB Other Total 2021 2020 2021 2020 2021 2020 2021 2020 Change in benefit obligation: Benefit obligation – beginning of year $ 58,740 $ 54,211 $ — $ 168,186 $ 3,149 $ 30,071 $ 61,889 $ 252,468 Service cost 790 711 — 4,778 28 1,052 818 6,541 Interest cost 1,421 1,692 — 5,172 65 944 1,486 7,808 Participant contributions — — — — 151 238 151 238 Actuarial (gains) losses (1,563) 4,845 — 21,362 (79) 2,127 (1,642) 28,334 Benefits paid (2,830) (2,719) — (10,909) (313) (1,154) (3,143) (14,782) Disposition of benefit obligation — — — (188,589) (235) (30,129) (235) (218,718) Benefit obligation – end of year $ 56,558 $ 58,740 $ — $ — $ 2,766 $ 3,149 $ 59,324 $ 61,889 Change in plan assets: Fair value of plan assets - beginning of year $ 55,976 $ 52,059 $ — $ 93,982 $ — $ 9,698 $ 55,976 $ 155,739 Actual return on plan assets 1,846 6,636 — 5,743 — 729 1,846 13,108 Employer contributions — — — — 162 562 162 562 Participant contributions — — — — 151 238 151 238 Benefits paid (2,830) (2,719) — (10,909) (313) (1,154) (3,143) (14,782) Disposition of plan asset due to sale of business — — — (88,816) — (10,073) — (98,889) Fair value of plan assets – end of year $ 54,992 $ 55,976 $ — $ — $ — $ — $ 54,992 $ 55,976 For the HG DB Plan, both accumulated and projected benefit obligations were $56.6 million and were in excess of the fair value of plan assets of $55.0 million on December 31, 2021. This compares with aggregate accumulated and projected benefit obligations of $58.7 million, which were also in excess of the aggregate fair value of plan assets of $56.0 million on December 31, 2020. The remaining postretirement plans resulted in accumulated postretirement benefit obligations of $2.8 million on December 31, 2021 and $3.2 million on December 31, 2020. Fair value of plan assets on these plans were zero for both periods. Actuarial gains in the changes in benefit obligations for 2021 resulted primarily due to increase in discount rate. For 2020 actuarial losses resulted primarily due to decrease in discount rate (see assumptions used in table below). In 2021 and 2020, there were no contributions made to the HG DB Plan. As of December 31, 2021, Hawaii Gas is not expected to make any cash contribution to the HG DB Plan through 2031. The annual amount of any cash contributions will be dependent upon a number of factors such as market conditions and changes to regulations. The funded status on December 31, 2021 and 2020 are presented in the following table ($ in thousands): HG DB IMTT DB Other Plan Total 2021 2020 2021 2020 2021 2020 2021 2020 Funded status Funded status at end of year $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) Net amount recognized in balance sheet $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) Amounts recognized in balance sheet consisting of: Current liabilities $ — $ — $ — $ — $ (243) $ (248) $ (243) $ (248) Noncurrent liabilities (1,566) (2,764) — — (2,523) (2,901) (4,089) (5,665) Net amount recognized in balance sheet $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss in 2021 and 2020 are presented in the following table ($ in thousands): HG DB IMTT DB Other Total 2021 2020 2021 2020 2021 2020 2021 2020 Prior service cost $ — $ — $ — $ — $ 18 $ (157) $ 18 $ (157) Accumulated loss (6,482) (7,836) — (40,496) (436) (6,540) (6,918) (54,872) Accumulated other comprehensive loss (6,482) (7,836) — (40,496) (418) (6,697) (6,900) (55,029) Net periodic benefit cost in excess (deficit) of cumulative employer contributions 4,916 5,072 — (59,277) (2,583) (16,508) 2,333 (70,713) Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business — — — 59,277 240 13,873 240 73,150 Reclassification to net income (loss) due to sale of business (1) — — — 40,496 (5) 6,183 (5) 46,679 Net amount recognized in balance sheet $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) (1) Reclassified to discontinued operations in the consolidated statement of operations in connection with the IMTT and AA Transaction. See Note 4, "Discontinued Operations and Dispositions", for further discussions. The components of net periodic benefit cost and other changes in other comprehensive (income) loss for the plans are shown below ($ in thousands): HG DB Plan Benefits IMTT DB Other Plan Benefits Total 2021 2020 2019 2021 2020 2019 2021 2020 2019 2021 2020 2019 Components of net periodic benefit cost: Service cost $ 790 $ 711 $ 619 $ — $ 4,778 $ 4,512 $ 28 $ 1,052 $ 1,063 $ 818 $ 6,541 $ 6,194 Interest cost 1,421 1,692 2,032 — 5,172 6,000 65 944 1,145 1,486 7,808 9,177 Expected return on plan assets (2,426) (2,280) (2,189) — (4,755) (4,605) — (508) (460) (2,426) (7,543) (7,254) Recognized actuarial loss 371 306 705 — 443 — 33 193 99 404 942 804 Amortization of prior service (cost) credit — — — — — — (16) 2 2 (16) 2 2 Net periodic benefit cost $ 156 $ 429 $ 1,167 $ — $ 5,638 $ 5,907 $ 110 $ 1,683 $ 1,849 $ 266 $ 7,750 $ 8,923 Other changes recognized in other comprehensive (income) loss: Net (gain) loss arising during the year $ (983) $ 488 $ (1,439) $ — $ 20,374 $ 13,419 $ (79) $ 1,907 $ 736 $ (1,062) $ 22,769 $ 12,716 Amortization of prior service cost (credit) — — — — — — 16 (2) (2) 16 (2) (2) Amortization of loss (371) (306) (705) — (443) — (33) (193) (99) (404) (942) (804) Total recognized in other comprehensive (income) loss $ (1,354) $ 182 $ (2,144) $ — $ 19,931 $ 13,419 $ (96) $ 1,712 $ 635 $ (1,450) $ 21,825 $ 11,910 The estimated amounts that will be amortized from accumulated other comprehensive loss over the next year are presented in the following table ($ in thousands): HG DB Plan Benefits Other Plan Benefits Total 2021 2020 2021 2020 2021 2020 Amortization of prior service cost $ — $ — $ (16) $ (15) $ (16) $ (15) Amortization of net loss 126 282 15 22 141 304 The assumptions used in accounting for the HG DB Plan Benefits, IMTT DB Plan Benefits, and Other Plan Benefits are: HG DB Plan Benefits IMTT DB Plan Benefits Other Plan Benefits 2021 2020 2019 2021 2020 2019 2021 2020 2019 Weighted average assumptions to determine benefit obligations: Discount rate 2.80 % 2.45 % 3.20 % N/A 2.60 % 3.25 % 1.73% to 2.55% 1.73% to 2.75% 2.82% to 3.35% Rate of compensation increase N/A N/A N/A N/A 4.57 % 4.57 % N/A 4.57 % (1) 4.57 % (1) Measurement date Dec 31 Dec 31 Dec 31 N/A Dec 23 Dec 31 Sep 23 - Dec 31 (2) Dec 23 - Dec 31 (3) Dec 31 Weighted average assumptions to determine net cost: Discount rate 2.45 % 3.20 % 4.25 % N/A 3.25 % 4.35 % 1.73% to 2.15% 2.82% to 3.35% 3.91% to 4.35% Expected long-term rate of return on plan assets during fiscal year 4.45 % 4.50 % 4.90 % N/A 5.50 % 5.50 % N/A 5.50 % (4) 5.50 % (4) Rate of compensation increase N/A N/A N/A N/A 4.57 % 4.57 % N/A 4.57 % (1) 4.57 % (1) Assumed healthcare cost trend rates: Initial health care cost trend rate 7.00 % 7.25 % 7.25% to 7.75% Ultimate rate 4.50 % 4.50 % 4.50% to 5.00% Year ultimate rate is reached 2030 2029 2027 to 2028 (1) Only applies to IMTT post-retirement life insurance plan. (2) Measurement date related to the AA post-retirement welfare benefits was September 23, 2021. (3) Measurement date related to the IMTT post-retirement life insurance plan and IMTT-Illinois Union Plan was December 23, 2020. (4) Only applies to IMTT-Illinois Union Plan. Pension asset investment decisions are made with assistance of an outside paid advisor to achieve the multiple goals of high rate of return, diversification, and safety. The business has instructed the trustee, the investment manager, to maintain the allocation of the defined benefit plans’ assets with fixed income securities, equity securities, real estate fund investments, and cash. The asset allocation on December 31, 2021 and 2020 were: HG DB 2021 2020 Equity securities 37 % 25 % Fixed income securities 57 % 70 % Global real estate fund 5 % 4 % Cash 1 % 1 % Total 100 % 100 % The expected returns on plan assets were estimated based on the allocation of assets and management’s expectations regarding future performance of the investments held in the investment portfolios. The asset allocations as of December 31, 2021 and 2020 measurement dates were ($ in thousands): Fair Value Measurement on December 31, 2021 Total Quoted Prices in Active Significant Significant Asset category: Cash and money market $ 725 $ 725 $ — $ — Equity securities 20,114 — 20,114 — Fixed income securities 31,219 — 31,219 — Global real estate fund 2,934 — 2,934 — Total $ 54,992 $ 725 $ 54,267 $ — Fair Value Measurement on December 31, 2020 Total Quoted Prices Significant Significant Asset category: Cash and money market $ 489 $ 489 $ — $ — Equity securities 14,276 — 14,276 — Fixed income securities 39,115 — 39,115 — Global real estate fund 2,096 — 2,096 — Total $ 55,976 $ 489 $ 55,487 $ — The estimated future benefit payments for the next ten years are ($ in thousands): 2022 $ 3,299 2023 3,328 2024 3,330 2025 3,370 2026 3,390 Thereafter 17,033 Total $ 33,750

Legal Proceedings and Contingen

Legal Proceedings and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings and Contingencies	Legal Proceedings and ContingenciesThe Company and its subsidiaries are subject to legal proceedings arising in the ordinary course of business. In management’s opinion, the Company has adequate legal defenses and/or insurance coverage with respect to the eventuality of such actions and does not believe the outcome of any pending legal proceedings will be material to the Company’s financial position or result of operations.

Quarterly Data (Unaudited)

Quarterly Data (Unaudited)	12 Months Ended
	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Quarterly Data (Unaudited)	Quarterly Data (Unaudited) The following table represents the summary of financial data from both continuing and discontinued operations for the quarters related to the years ended December 31, 2021 and 2020. Quarter ended March 31 June 30 September 30 December 31 (In Thousands, except per unit data) 2021 Revenue from continuing operations $ 54,587 $ 58,740 $ 60,086 $ 62,571 Operating loss from continuing operations (1,070) (5,628) (282,344) (4,959) Net loss from continuing operations attributable to MIH (6,867) (15,124) (274,637) (3,857) Net income (loss) from discontinued operations attributable to MIH 20,067 22,473 2,954,444 (12,631) Per unit information attributable to MIH (1) : Basic loss per unit from continuing operations attributable to MIH $ (0.08) $ (0.18) $ (3.12) $ (0.05) Basic income (loss) per unit from discontinued operations attributable to MIH 0.23 0.26 33.61 (0.14) Basic income (loss) per unit attributable to MIH 0.15 0.08 30.49 (0.19) Diluted loss per unit from continuing operations attributable to MIH $ (0.08) $ (0.18) $ (3.12) $ (0.05) Diluted income (loss) per unit from discontinued operations attributable to MIH 0.23 0.26 33.61 (0.14) Diluted income (loss) per unit attributable to MIH 0.15 0.08 30.49 (0.19) Cash distribution declared per unit $ — $ — $ 37.386817 $ — 2020 Revenue from continuing operations $ 60,462 $ 36,795 $ 39,036 $ 44,118 Operating (loss) income from continuing operations (11,175) 266 (5,960) (52,832) Net loss from continuing operations attributable to MIH (18,003) (2,280) (5,368) (71,131) Net income (loss) from discontinued operations attributable to MIH 29,305 (5,674) (887,880) 33,170 Per unit information attributable to MIH (1) : Basic loss per unit from continuing operations attributable to MIH $ (0.21) $ (0.02) $ (0.06) $ (0.82) Basic income (loss) per unit from discontinued operations attributable to MIH 0.34 (0.07) (10.20) 0.38 Basic income (loss) per unit attributable to MIH 0.13 (0.09) (10.26) (0.44) Diluted loss per unit from continuing operations attributable to MIH $ (0.21) $ (0.02) $ (0.06) $ (0.82) Diluted income (loss) per unit from discontinued operations attributable to MIH 0.34 (0.07) (10.20) 0.38 Diluted income (loss) per unit attributable to MIH 0.13 (0.09) (10.26) (0.44) Cash distribution declared per unit $ — $ — $ — $ 11.00 (1) Due to averaging of units, quarterly earnings per unit may not sum to the totals reported for the full year.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company consolidates investments where it has a controlling financial interest. The general condition for a controlling financial interest is ownership of a majority of the voting interest and, therefore, as a general rule, ownership, directly or indirectly, of over 50% of the outstanding voting shares is a condition for consolidation. In addition, if the Company demonstrates that it has the ability to direct policies and management, this may be also an indication for consolidation. For investments in variable interest entities, the Company consolidates when it is determined to be the primary beneficiary of the variable interest entity. The Company is the primary beneficiary in the solar facilities in Hawaii and consolidated these projects accordingly.
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements, which are in conformity with generally accepted accounting principles ("GAAP"), requires the Company to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting period. The Company evaluates these estimates and judgments on an ongoing basis and the estimates are based on experience, current and expected future conditions, third-party evaluations, and various other assumptions that the Company believes are reasonable under the circumstances. Significant items subject to such estimates and assumptions include the carrying amount of property, equipment, land, and leasehold improvements, intangibles, and goodwill; assets and obligations related to employee benefits; and valuation of derivative instruments. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from the estimates and assumptions used in the financial statements and related notes.
Business Combinations	Business Combinations Acquisitions of businesses that the Company controls are accounted for under the purchase method of accounting. The amounts assigned to the identifiable assets acquired and liabilities assumed in connection with acquisitions are based on estimated fair values as of the date of the acquisition, with the remainder, if any, recorded as goodwill. The fair values are determined by the Company’s management, taking into consideration information supplied by the management of acquired entities and other relevant information. Such information includes valuations supplied by independent appraisal experts for significant business combinations. The valuations are generally based upon future cash flow projections for the acquired assets, discounted to a present value. The determination of fair value requires significant judgment both by management and outside experts engaged to assist in this process.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments, including commercial paper issued by counterparties with Standard & Poor's rating of A1+ or higher, with maturity of three months or less when purchased to be cash and cash equivalents. The Company did not have any investments in commercial paper on December 31, 2021 and 2020.
Restricted Cash	Restricted CashOn December 31, 2021 and 2020, restricted cash consists primarily of deposits held by banks to fund certain obligations under its agreements in place at the solar facilities in Hawaii.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The Company uses estimates to determine the amount of allowance for doubtful accounts necessary to reduce accounts receivable to its net realizable value. The Company estimates the required allowance by reviewing the status of past-due receivables and analyzing historical bad debt trends. Actual collection experience has not varied significantly from estimates primarily due to credit policies and a lack of concentration of accounts receivable. The Company writes-off receivables deemed to be uncollectible to the allowance for doubtful accounts.
Inventory	Inventory Inventory consists principally of gas purchased from various third-party vendors and materials and supplies. Gas inventory is stated at the lower of cost or market and materials and supplies inventory are valued at the lower of average cost or market. Inventory sold is recorded using an average cost method at the businesses in Hawaii. Cash flows related to the sale of inventory are classified in net cash provided by operating activities in the consolidated statements of cash flows.
Property, Equipment, Land and Leasehold Improvements	Property, Equipment, Land, and Leasehold Improvements Property, equipment, land, and leasehold improvements are initially recorded at cost. Major renewals and improvements are capitalized while repair and maintenance expenditures are expensed when incurred. Interest expense relating to construction in progress is capitalized as an additional cost of the asset. The Company depreciates property, equipment, and leasehold improvements over their estimated useful lives on a straight-line basis. The estimated economic useful lives range is up to 68 years for buildings, leasehold and land improvements, machinery and equipment, and furniture and fixtures.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill consists of costs in excess of the aggregate purchase price over the fair value of tangible and identifiable intangible net assets acquired in business combinations. The cost of intangible assets with determinable useful lives is amortized over their estimated useful lives of 20 years.
Impairment of Long-lived Assets, Excluding Goodwill	Impairment of Long-lived Assets, Excluding Goodwill Long-lived assets, including amortizable intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or group of assets may not be fully recoverable. These events or changes in circumstances may include a significant deterioration of operating results, changes in business plans, or changes in anticipated future cash flows. If an impairment indicator is present, the Company evaluates recoverability by comparing the carrying amount of the assets to future undiscounted net cash flows expected to be generated by the assets. If the assets are impaired, the impairment recognized is measured by the amount by which the carrying amount exceeds the fair value of the assets. Fair value is generally determined by estimates of discounted cash flows or value expected to be realized in a third-party sale. The discount rate used in any estimate of discounted cash flows would be the rate required for a similar investment of like risk.
Impairment of Goodwill	Impairment of Goodwill Goodwill is tested for impairment at least annually on October 1 or when there is a triggering event that indicates the possibility of an impairment. For the annual impairment test, an entity can make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before performing a quantitative goodwill impairment test, as discussed below. If an entity concludes it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, it need not perform the quantitative impairment test. If an entity concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, or if there is a triggering event that indicates impairment, the entity needs to perform a quantitative impairment test. This requires management to make judgments in determining what assumptions to use in the calculation. The Company estimates the fair value by estimating the present value of the future discounted cash flows or value expected to be realized in a third-party sale. If the recorded net assets are less than the estimated fair value, then no impairment is indicated. If the recorded amount of goodwill exceeds the estimated fair value, an impairment charge is recorded for the excess. See Note 8,
Leases	Leases The Company accounts for leases in accordance with ASC 842, Leases
Impairment of Indefinite-lived Intangibles, Excluding Goodwill	Impairment of Indefinite-lived Intangibles, Excluding Goodwill Indefinite-lived intangibles, which consist of trademarks, are considered impaired when the carrying amount of the asset exceeds its estimated fair value. The Company estimates the fair value of each trademark using the relief from royalty method that discounts the estimated net cash flows the Company would have to pay to license the trademark under an arm’s length licensing agreement. If the recorded indefinite-lived intangible is less than its estimated fair value, then no impairment is indicated. Alternatively, if the recorded intangible asset exceeds its fair value, an impairment loss is recognized in an amount equal to that excess.
Debt Financing Costs	Debt Financing Costs The Company capitalizes all direct costs incurred in connection with the issuance of debt as debt financing costs. On December 31, 2021, these costs are amortized over the contractual term of the debt instrument which ranges from 4 to 10 years with a weighted average remaining life of 2.9 years.
Derivative Instruments	Derivative Instruments From time to time the Company enters into interest rate derivative agreements to minimize potential variations in cash flows resulting from fluctuations in interest rates and their impact on its variable-rate debt. Hawaii Gas enters into commodity cost hedges to mitigate the impact of fluctuations in liquefied petroleum gas ("LPG") prices on its cash flows. The Company accounts for derivatives and hedging activities in accordance with Accounting Standard Codification ("ASC") 815, Derivatives and Hedging , which requires that all derivative instruments be recorded on the balance sheet at their respective fair values. All movements in the fair value of derivative contracts are recorded directly through earnings. See Note 10, “Derivative Instruments and Hedging Activities”, for further discussions.
Financial Instruments	Financial Instruments The Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, and variable-rate senior debt, are carried at cost, which approximates their fair value because of either the short-term maturity, or competitive interest rates assigned to these financial instruments. The fair values of the Company’s other debt instruments fall within level 1 or level 2 of the fair value hierarchy.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company places its cash and cash equivalents with financial institutions and its balances may exceed federally insured limits. The Company’s accounts receivable balances are mainly derived from gas sales rendered under contract terms with commercial and private customers located in the United States. On December 31, 2021 and 2020, there were no outstanding accounts receivable due from a single customer that accounted for more than 10% of the total accounts receivable. Additionally, no single customer accounted for more than 10% of the Company’s revenue in 2021, 2020, and 2019.
Foreign Currency Translation	Foreign Currency Translation The assets and liabilities of IMTT’s Newfoundland and Quebec locations were translated from their local currency (Canadian dollars) to U.S. dollars at exchange rates in effect at the end of the reporting period and consolidated statement of operations accounts are translated at average exchange rates for the reporting period. Translation gains or losses as a result of changes in the exchange rate were recorded as a component of other comprehensive income (loss) through the date of sale.
Accrued Expenses	Accrued ExpensesAccrued expenses of $18.4 million and $17.8 million on December 31, 2021 and 2020, respectively, primarily consisted of payroll and related liabilities, interest, non-income related taxes, insurance, purchase of property and equipment, and other individually insignificant balances.
Income per Unit	Income per Unit The Company calculates income per unit using the weighted average number of common units outstanding during the period. Diluted income per unit is computed using the weighted average number of dilutive common equivalent units outstanding during the period. Common equivalent units may consist of (i) units issuable upon conversion of the Company’s convertible senior notes (using the if-converted method); (ii) director share units granted to the Company’s independent directors under the 2014 Independent Directors Equity Plan; (iii) stock units granted to certain employees of the Company's operating businesses under the 2016 Omnibus Employee Incentive Plan; and (iv) fees payable to the Manager that will be reinvested in common units by the Manager in a future period, if any. Common equivalent units are excluded from the calculation if their effect is anti-dilutive.
Comprehensive Income (Loss)	Comprehensive Income (Loss) The Company follows the requirements of ASC 220, Comprehensive Income , for the reporting and presentation of comprehensive income (loss) and its components, net of taxes. For the Company, the guidance requires unrealized gains or losses on foreign currency translation adjustments and minimum pension liability adjustments to be included in other comprehensive income (loss), net of taxes.
Regulatory Assets and Liabilities	Regulatory Assets and Liabilities The utility operations of Hawaii Gas are subject to regulation with respect to rates, service, maintenance of accounting records, and various other matters by the HPUC. The established accounting policies recognize the financial effects of the rate-making and accounting practices and policies of the HPUC. Regulated utility operations are subject to the provisions of ASC 980, Regulated Operations . This guidance requires regulated entities to disclose in their financial statements the authorized recovery of costs associated with regulatory decisions. Accordingly, certain costs that otherwise would normally be charged to expense may, in certain instances, be recorded as an asset in a regulatory entity’s balance sheet. The Hawaii Gas business records regulatory assets as costs that have been deferred for which future recovery through customer rates may be approved by the HPUC in a future proceeding. Regulatory liabilities represent amounts included in rates and collected from customers for costs expected to be incurred in the future. ASC 980 may, at some future date, be deemed inapplicable because of changes in the regulatory and competitive environments or other factors. If the Company were to discontinue the application of this guidance, the Company would be required to write-off its regulatory assets and regulatory liabilities and would be required to adjust the carrying amount of any other assets, including property, plant, and equipment, that would be deemed not recoverable related to these affected operations. The Company believes its regulated operations in the Hawaii Gas business continue to meet the criteria of ASC 980 and that the carrying value of its regulated property, plant, and equipment is recoverable in accordance with established HPUC rate-making practices.
Income Taxes	Income Taxes MIH is a limited liability company treated as a partnership for tax purposes. Taxable income/losses reported by MIH will be passed-through to the unitholders and reported on a Schedule K-1. MIH does not pay a state or federal income tax. As a partnership, MIH itself will not pay income tax on the gain from the AA Transaction. As part of the reorganization, the entity holding the businesses comprising MIC's MIC Hawaii segment was distributed to and became directly owned by MIH. For tax purposes, the distribution was deemed to be a sale and unitholders were deemed to have received a distribution of the fair market value of the equity of MIC's MIC Hawaii segment. Following the reorganization, the subsidiaries of the Company are owned by an intermediate holding company organized as a limited liability company and classified as a corporation for tax purposes. The intermediate holding company files a combined Hawaii state income tax return and will file a consolidated federal income tax return for the periods after the reorganization. The intermediate holding company accounts for income taxes using the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The intermediate holding company and its more than 80% owned subsidiaries will file a consolidated U.S. federal income tax return. In assessing the need for a valuation allowance, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment.
Reclassifications	Reclassifications Certain reclassifications were made to the consolidated financial statements for the prior periods to conform to current year presentation.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40). The amendments in this ASU impact the accounting for convertible instruments by reducing the number of accounting models used to account for these instruments and amending diluted earnings per share calculations. It also simplifies the requirements for contracts indexed to and potentially settled in an entity's own equity. The amendments in this update are effective for fiscal years ending after December 15, 2021. Early adoption is permitted. The Company adopted this ASU on January 1, 2021 using the modified retrospective method and made an adjustment to the beginning balance to Retained Earnings. The impact of this ASU has been reflected in the consolidated financial statements and disclosures related to the Company's convertible debt instruments. See Note 9, "Long-Term Debt", for further discussions. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of Effects of Reference Rate Reform on Financial Reporting , which provides practical expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The expedients and exceptions provided by the amendments in this update apply only to contracts, hedging relationships, and other transactions that reference the London interbank offered rate ("LIBOR") or another reference rate expected to be discontinued as a result of reference rate reform. In January 2021, the FASB also issued ASU No. 2021-01, Reference Rate Reform (Topic 848): Scope , which clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. These amendments are elective and apply to all entities that have derivative instruments that use an interest rate for margining, discounting, or contract price alignment that is modified as a result of reference rate reform. These amendments are not applicable to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. ASU No. 2020-04 and ASU No. 2021-01 are effective as of March 12, 2020 and through December 31, 2022, and may be applied to contract modifications and hedging relationships from the beginning of an interim period that includes or is subsequent to March 12, 2020. The Company is currently evaluating the impact of adoption on its financial statements and related disclosures.

Discontinued Operations and D_2

Discontinued Operations and Dispositions (Tables)	12 Months Ended
	Dec. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups	A summary of assets and liabilities held for sale included in the Company's consolidated balance sheet related to the Atlantic Aviation business ("AA Business") as of December 31, 2020 are as follows ($ in thousands): As of Assets Cash and cash equivalents $ 309,955 Restricted cash 10,121 Accounts receivable, net of allowance for doubtful accounts 23,749 Other current assets 20,583 Total current assets 364,408 Property, equipment, land, and leasehold improvements, net 556,825 Operating lease assets, net 313,014 Goodwill 496,746 Intangible assets, net 452,664 Other noncurrent assets 1,345 Total assets $ 2,185,002 Liabilities Accounts payable and accrued expenses $ 45,702 Current portion of long-term debt 10,250 Operating lease liabilities - current 15,138 Income taxes payable, net 132,113 Other current liabilities 13,270 Total current liabilities 216,473 Long-term debt, net of current portion 976,190 Deferred income taxes 100,405 Operating lease liabilities - noncurrent 303,728 Other noncurrent liabilities 17,034 Total liabilities $ 1,613,830 Summarized financial information for discontinued operations included in the Company’s consolidated statement of operations related to the IMTT segment for the years ended December 31, 2020 and 2019 are as follows ($ in thousands): Year Ended December 31, 2020 2019 Service revenue $ 488,284 $ 515,102 Cost of services (192,884) (204,146) Selling, general and administrative expenses (38,094) (33,158) Impairment (750,000) — Depreciation and amortization (102,193) (132,768) Interest expense, net (42,715) (47,930) Other (expense) income, net (1) (60,874) 1,116 Net (loss) income from discontinued operations before income taxes (698,476) 98,216 Provision for income taxes (23,777) (23,866) Net (loss) income from discontinued operations attributable to MIH $ (722,253) $ 74,350 (1) Other income, net, includes loss of approximately $69.6 million from the sale of IMTT in 2020. Summarized financial information for discontinued operations included in the Company’s consolidated statement of operations related to its former Contracted Power segment for 2019 is as follows ($ in thousands): Year ended December 31, 2019 Product revenue $ 44,411 Cost of product sales (7,389) Selling, general and administrative expenses (19,148) Depreciation and amortization (608) Interest expense, net (12,888) Other income, net (1) 81,156 Net income from discontinued operations before income taxes 85,534 Provision for income taxes (32,803) Net income from discontinued operations 52,731 Less: net loss attributable to noncontrolling interests (3,109) Net income from discontinued operations attributable to MIH $ 55,840 (1) Other income, net, includes gains of approximately $80.2 million from the sale of renewable businesses in 2019.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Operating Lease Expense	The Company’s operating lease expenses recorded within the consolidated statement of operations for 2021, 2020 and 2019 were as follows ($ in thousands): Income Statement Classification Year Ended December 31, 2021 2020 2019 Cost of product sales $ 2,267 $ 2,301 $ 2,295 Selling, general and administrative 244 248 240 Total operating lease expense (1) $ 2,511 $ 2,549 $ 2,535 (1) Includes expense related to leases less than one year of $105,000 for both 2021 and 2020, and $179,000 for 2019. Includes variable lease expense of $323,000, $345,000 and $330,000 in 2021, 2020 and 2019, respectively.
Lessee, Operating Lease, Liability, Maturity	The following table represents the future maturities of lease liabilities on December 31, 2021 ($ in thousands): 2022 $ 2,350 2023 2,230 2024 1,990 2025 1,731 2026 1,672 Thereafter 6,936 Total lease payment 16,909 Less: interest (4,305) Present value of lease liability $ 12,604

Income per Unit (Tables)

Income per Unit (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Reconciliation of Earnings Income (Loss) per Unit	Following is a reconciliation of the basic and diluted (loss) income per unit computations ($ in thousands, except unit and per unit data): Year ended December 31, 2021 2020 2019 Numerator: Basic and diluted net loss from continuing operations attributable $ (300,485) $ (96,782) $ (25,006) Basic and diluted net income (loss) from discontinued operations $ 2,984,353 $ (831,079) $ 181,514 Denominator: Weighted average number of units outstanding: basic 87,791,951 86,951,642 86,178,212 Weighted average number of units outstanding: diluted 87,791,951 86,951,642 86,178,212 Year ended December 31, 2021 2020 2019 Income per unit: Basic loss per unit from continuing operations attributable $ (3.42) $ (1.11) $ (0.29) Basic income (loss) per unit from discontinued operations 33.99 (9.56) 2.11 Basic income (loss) per unit attributable to MIH $ 30.57 $ (10.67) $ 1.82 Diluted loss per unit from continuing operations attributable $ (3.42) $ (1.11) $ (0.29) Diluted income (loss) per unit from discontinued operations 33.99 (9.56) 2.11 Diluted income (loss) per unit attributable to MIH $ 30.57 $ (10.67) $ 1.82
Schedule of Antidilutive Securities	The following represents the weighted average potential dilutive common units that were excluded from the diluted income per unit calculation: Year ended December 31, 2021 2020 2019 Restricted unit grants 109,185 108,760 26,089 2.875% Convertible Senior Notes due July 2019 (1) — — 1,321,243 2.00% Convertible Senior Notes due October 2023 (2) 1,689,203 3,634,173 3,634,173 Total 1,798,388 3,742,933 4,981,505 (1) On July 15, 2019, the Company fully repaid the outstanding balance on the 2.875% Convertible Senior Notes due July 2019 at maturity using cash on hand. The weighted average units reflect the “if-converted” impact to dilutive common units through the maturity date of the Notes. (2) During 2021, the Company repurchased $395.7 million in aggregate principal amount of the 2.00% Convertible Senior Notes, of which $358.6 million and $26.9 million were repurchased in tender offers on March 16, 2021 and October 22, 2021, respectively. For 2021, the weighted average units reflect the “if-converted” dilutive impact to common units for the repurchased Notes for the period that the Notes were outstanding and the impact of the increase to the conversion rate following the special dividend pertaining to the IMTT Transaction and the one-time distribution pertaining to the AA Transaction paid on January 8, 2021 and October 7, 2021, respectively. See Note 9, “Long-Term Debt”, for further discussions.

Property, Equipment, Land and_2

Property, Equipment, Land and Leasehold Improvements (Tables)	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Schedule of Property, Equipment, Land and Leasehold Improvements	Property, equipment, land, and leasehold improvements on December 31, 2021 and 2020 consist of the following ($ in thousands): As of December 31, 2021 2020 Land $ 10,710 $ 10,710 Buildings 4,427 4,142 Leasehold and land improvements 20,003 19,824 Machinery and equipment 376,924 363,379 Furniture and fixtures 3,740 3,664 Construction in progress 11,313 11,524 427,117 413,243 Less: accumulated depreciation (129,927) (115,868) Property, equipment, land, and leasehold improvements, net $ 297,190 $ 297,375

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets on December 31, 2021 and 2020 consist of the following ($ in thousands): As of December 31, 2021 2020 Customer relationships $ 7,400 $ 7,400 Trade names 8,500 8,500 Leasehold rights 100 100 16,000 16,000 Less: accumulated amortization (11,502) (11,077) Intangible assets, net $ 4,498 $ 4,923
Schedule of Future Amortization Expense for Amortizable Intangible Assets	The estimated future amortization expense for amortizable intangible assets to be recognized are ($ in thousands): 2022 $ 425 2023 425 2024 425 2025 425 2026 425 Thereafter 2,373 Total $ 4,498
Schedule of Goodwill	The goodwill balance on December 31, 2021 comprised the following ($ in thousands): Atlantic Aviation Hawaii Total Goodwill acquired in business combinations, net of disposals, on December 31, 2020 $ 620,599 $ 123,333 $ 743,932 Accumulated impairment charges (123,200) (3,215) (126,415) Other (653) 75 (578) Transfer to asset held for sale (496,746) — (496,746) Balance on December 31, 2020 — 120,193 120,193 Balance on December 31, 2021 $ — $ 120,193 $ 120,193

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	On December 31, 2021 and 2020, the Company’s consolidated long-term debt comprised of the following ($ in thousands): As of December 31, 2021 2020 Term Loan - Hawaii Gas $ 80,000 $ 180,000 Term Loan - Solar Facilities in Hawaii 12,698 13,758 2.00% Convertible Senior Notes 6,821 391,252 Total 99,519 585,010 Current portion (1,107) (1,060) Long-term portion 98,412 583,950 Unamortized debt financing costs (1) (757) (5,781) Long-term portion less unamortized debt discount and debt financing costs $ 97,655 $ 578,169 (1) The weighted average remaining life of the debt financing costs on December 31, 2021 was 2.9 years.
Schedule of Future Maturities of Long-Term Debt	The following table represents the future maturities of long-term debt balances on December 31, 2021 ($ in thousands). 2022 $ 1,107 2023 7,976 2024 81,204 2025 1,258 2026 7,974 Thereafter — Total $ 99,519
Convertible Debt	The 2.00% Convertible Senior Notes consisted of the following ($ in thousands): As of December 31, 2021 (1) 2020 Liability Component: Principal $ 6,821 $ 402,500 Unamortized debt discount — (11,248) Long-term debt, net of unamortized debt discount 6,821 391,252 Unamortized debt financing costs — (4,134) Net carrying amount $ 6,821 $ 387,118 Equity Component $ — $ 26,748 (1) Reflects the repurchase of 2.00% Convertible Senior Notes and the adoption of ASU No. 2020-06 effective January 1, 2021.
Schedule of Interest Expense	In 2021, 2020, and 2019, total interest expense recognized related to the 2.00% Convertible Senior Notes consisted of the following ($ in thousands): Year ended December 31, 2021 2020 2019 Contractual interest expense $ 2,171 $ 8,050 $ 8,050 Amortization of debt discount — 3,858 3,741 Amortization of debt financing cost 413 1,503 1,503 Write-off of debt financing cost 4,016 — — Total interest expense $ 6,600 $ 13,411 $ 13,294
Schedule of Material Terms	The key terms of the 2.00% Convertible Senior Notes are summarized in the table below. Facility Terms 2.00% Convertible Senior Notes Amount outstanding on December 31, 2021 $6.8 million Maturity October 2023 Amortization Payable at maturity or convertible at the holder’s option into cash, the Company’s units, or a combination thereof, only upon satisfaction of one or more conditions set forth in the indenture Interest Rate 2.00% payable on April 1 st and October 1 st of each year Security Unsecured The key terms of the term loan and revolving credit facility of Hawaii Gas are summarized in the table below. Facility Terms Holding Company Debt Operating Company Debt Borrowers HGC Holdings LLC ("HGC") The Gas Company, LLC ("TGC") Facilities $80.0 million term loan (fully drawn at December 31, 2021) $60.0 million revolving credit facility (undrawn at December 31, 2021) Maturity February 2024 February 2024 Amortization Payable at maturity Revolving, payable at maturity Interest Rate LIBOR plus 1.25% on December 31, 2021 LIBOR plus 1.00% on December 31, 2021 Commitment Fees — 0.175% on the undrawn portion Collateral First lien on all assets of HGC and its subsidiaries First lien on all assets of TGC and its subsidiaries

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative Instruments	The Company’s fair value measurements of its derivative instruments and the related location of the assets and liabilities within the consolidated balance sheets on December 31, 2021 and 2020 were ($ in thousands): Balance Sheet Classification Assets (Liabilities) at Fair Value as of December 31, 2021 2020 Fair value of derivative instruments - other current assets $ 909 $ 935 Fair value of derivative instruments - other noncurrent assets 470 — Total derivative contracts - assets $ 1,379 $ 935 Fair value of derivative instruments - other current liabilities $ (122) $ (172) Fair value of derivative instruments - other noncurrent liabilities — (449) Total derivative contracts - liabilities $ (122) $ (621)
Schedule of Location of Hedging Activities	The Company’s hedging activities during 2021, 2020, and 2019 and its related location within the consolidated statement of operations were ($ in thousands): Income Statement Classification Gain (Loss) Recognized for the Year ended December 31, 2021 2020 2019 Interest expense – interest rate swaps $ 333 $ (912) $ (875) Cost of product sales – commodity swaps 5,946 883 (10,082) Total $ 6,279 $ (29) $ (10,957)

Unitholders_ Equity (Tables)

Unitholders’ Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Schedule of Dividends	The Company’s Board have made or declared the following distributions during 2021, 2020, and 2019: Declared Period $ Record Payable September 23, 2021 (1) $ 37.386817 October 4, 2021 October 7, 2021 December 23, 2020 (2) 11.00 January 5, 2021 January 8, 2021 February 14, 2020 Fourth quarter 2019 1.00 March 6, 2020 March 11, 2020 October 29, 2019 Third quarter 2019 1.00 November 11, 2019 November 14, 2019 July 30, 2019 Second quarter 2019 1.00 August 12, 2019 August 15, 2019 April 29, 2019 First quarter 2019 1.00 May 13, 2019 May 16, 2019 February 14, 2019 Fourth quarter 2018 1.00 March 4, 2019 March 7, 2019 (1) One-time distribution declared and paid out of the proceeds from the AA Transaction. Units of MIH traded with "due bills" attached through October 7, 2021 and traded ex-distribution on October 8, 2021.
Schedule of Stock Issued to Board of Directors	Since 2019, the Company has granted and issued the following stock to the Board under the 2014 Plan: Date of Units Grant Date Fair Value Date of May 15, 2019 21,390 $ 42.01 May 13, 2020 May 14, 2020 32,112 27.43 May 11, 2021 March 9, 2021 (1) 12,024 30.48 May 11, 2021 May 19, 2021 25,974 34.90 September 23, 2021 (2) (1) Represents additional restricted stock unit grants to independent directors to preserve the economic value of the unvested grants after giving effect to the special dividend made in connection with the IMTT Transaction. (2) These director share units fully vested as a result of the AA Transaction, which constituted a change in control as defined in the 2014 Plan.
Schedule of Nonvested Restricted Stock Units Activity	The following represents unvested STIP RSU grants through December 31, 2021: STIP Grants Number of RSUs Weighted Average Grant-Date Fair Value Unvested balance on December 31, 2019 — $ — Granted 55,661 24.50 Forfeited (1,468) 24.50 Vested (1) (19,566) 32.57 Unvested balance on December 31, 2020 34,627 $ 24.50 Granted (2) 286,013 4.89 Forfeited (215) 24.92 Vested (3) (68,776) 31.03 Unvested balance on December 31, 2021 251,649 $ 2.49 (1) As a result of the IMTT Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the STIP RSU grants for eligible employees of IMTT. (2) During the quarter ended March 31, 2021, the Company granted an additional 12,614 RSUs to preserve the economic value of the unvested RSUs after giving effect to the special dividend made in connection with the IMTT Transaction. During the quarter ended December 31, 2021, the Company granted an additional 228,943 RSUs to preserve the economic value of the unvested RSUs after giving effect to the one-time distribution made in connection with the AA Transaction. (3) As a result of the AA Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the STIP RSU grants for eligible employees of Atlantic Aviation and MIC Global Services ("MGS"). These RSUs were fully vested on September 23, 2021. The following represents unvested Special RSUs granted through December 31, 2021: Special RSU Grants Number of RSUs Weighted Average Grant-Date Fair Value Unvested balance on December 31, 2019 6,067 $ 40.30 Granted 4,602 23.50 Vested (5,702) 26.74 Unvested balance on December 31, 2020 4,967 $ 40.30 Granted (1) 1,860 — Vested (6,827) 29.32 Unvested balance on December 31, 2021 — $ — (1) During the quarter ended March 31, 2021, the Company granted an additional 1,860 RSUs to preserve the economic value of the unvested RSUs after giving effect to the special dividend made in connection with the IMTT Transaction.
Schedule of Nonvested Performance-based Units Activity	The following represents unvested LTIP grants through December 31, 2021 at the target level of performance: LTIP Grants (at Target) Number of PSUs Weighted Average Grant-Date Fair Value Unvested balance on December 31, 2019 125,194 $ 39.62 Forfeited (18,965) 39.70 Vested (1) (34,708) 39.88 Unvested balance on December 31, 2020 71,521 $ 39.47 Granted (2) 1,205,242 5.73 Forfeited (3) (86,384) 31.39 Vested (3) (135,493) 37.93 Unvested balance on December 31, 2021 1,054,886 $ 2.76 (1) As a result of the IMTT Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the LTIP PSU grants for former eligible employees of IMTT. (2) During the quarter ended March 31, 2021, the Company granted an additional 26,004 PSUs to preserve the economic value of the unvested PSUs after giving effect to the special dividend made in connection with the IMTT Transaction. During the quarter ended December 31, 2021, the Company granted an additional 959,700 PSUs to preserve the economic value of the unvested PSUs after giving effect to the one-time distribution made in connection with the AA Transaction. (3) As a result of the AA Transaction, the Company's Compensation Committee and Board approved the accelerated vesting of the LTIP PSU grants for former eligible employees of Atlantic Aviation and MGS. These PSUs were fully vested on September 23, 2021.
Schedule of Accumulated Other Comprehensive Loss	The following represents the changes and balances to the components of accumulated other comprehensive loss, net of taxes, during 2021, 2020, and 2019 ($ in thousands): Post-Retirement Benefit Plans, net of taxes (1) Translation Adjustment, net of taxes (2) Total Balance on December 31, 2018 $ (15,622) $ (14,649) $ (30,271) Change in post retirement benefit plans (8,533) — (8,533) Translation adjustment — 1,932 1,932 Balance on December 31, 2019 $ (24,155) $ (12,717) $ (36,872) Change in post-retirement benefit plans (15,723) — (15,723) Translation adjustment — 1,141 1,141 Reclassification to net income (loss) due to sale of business (3) 33,703 11,576 45,279 Balance on December 31, 2020 $ (6,175) $ — $ (6,175) Change in post-retirement benefit plans 1,075 — 1,075 Reclassification to net income (loss) due to sale of business (3) (6) — (6) Balance on December 31, 2021 $ (5,106) $ — $ (5,106) (1) Change in post-retirement benefit plans is presented net of tax benefit of $375,000, $6.1 million, and $3.4 million in 2021, 2020 and 2019, respectively. (2) Translation adjustment is presented net of tax expense of $444,000 and $751,000 in 2020 and 2019, respectively.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Revenue From External Customers	Revenues from external customers were ($ in thousands): Year Ended December 31, 2021 2020 2019 Product revenue Lease $ 4,726 $ 3,355 $ 5,139 Gas 220,564 162,926 225,618 Other 10,694 14,130 11,880 Total revenue $ 235,984 $ 180,411 $ 242,637

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Schedule of Dividends Paid to Manager	Since January 1, 2019, the Company paid the Manager cash dividends and/or distributions on units held for the following periods: Declared Period $ Record Payable Cash Paid to September 23, 2021 (1) $ 37.386817 October 4, 2021 October 7, 2021 $ 544,841 December 23, 2020 (2) 11.00 January 5, 2021 January 8, 2021 153,503 February 14, 2020 Fourth quarter 2019 1.00 March 6, 2020 March 11, 2020 13,396 October 29, 2019 Third quarter 2019 1.00 November 11, 2019 November 14, 2019 13,116 July 30, 2019 Second quarter 2019 1.00 August 12, 2019 August 15, 2019 12,914 April 29, 2019 First quarter 2019 1.00 May 13, 2019 May 16, 2019 12,722 February 14, 2019 Fourth quarter 2018 1.00 March 4, 2019 March 7, 2019 12,598 (1) One-time distribution declared and paid out of the proceeds from the AA Transaction. Units of MIH traded with "due bills" attached through October 7, 2021 and traded ex-distribution on October 8, 2021.
Schedule of Base Management Fees and Performance Fees	The following table shows the Manager’s reinvestment of its base management fees and performance fees, if any, in units: Period Base Management Performance Units 2021 Activities: Fourth quarter 2021 $ 1,056 $ — 217,273 (1) Third quarter 2021 7,698 — 195,556 Second quarter 2021 7,551 — 214,040 First quarter 2021 5,552 — 176,296 2020 Activities: Fourth quarter 2020 $ 4,903 $ — 162,791 Third quarter 2020 4,980 — 172,976 Second quarter 2020 3,824 — 146,452 First quarter 2020 7,356 — 181,617 2019 Activities: Fourth quarter 2019 $ 8,712 $ — 208,881 Third quarter 2019 7,987 — 201,827 Second quarter 2019 7,876 — 192,103 First quarter 2019 7,528 — 184,448 (1) The Manager elected to reinvest all of the monthly base management fees for the quarter ended December 31, 2021 in new primary units. The Company issued 217,273 units for the quarter ended December 31, 2021, including 72,323 units that were issued in January 2022 for the December 2021 monthly base management fee.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Components of Income Taxes	The Company’s income tax (benefit) provision related to the income from continuing operations in 2021, 2020, and 2019 were ($ in thousands): Year Ended December 31, 2021 2020 2019 Current taxes: Federal $ (5,578) $ 804 $ 4,590 State 363 (3) (1,061) Total current tax (benefit) provision (5,215) 801 3,529 Deferred taxes: Federal 1,094 1,523 (10,281) State (3,706) 1,853 (4,888) Total deferred tax (benefit) provision (2,612) 3,376 (15,169) Total tax (benefit) provision $ (7,827) $ 4,177 $ (11,640)
Schedule of Deferred Tax Assets and Liabilities	The following represents the tax impact of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities from continuing operations on December 31, 2021 and 2020 ($ in thousands): As of December 31, 2021 2020 Deferred tax assets: Net operating loss carryforwards $ — $ 11,201 Deferred revenue 32 34 Accrued compensation 2,257 1,918 Accrued expense 338 316 Intangible assets 3,654 3,432 Other 2,919 3,796 Net deferred tax assets 9,200 20,697 Deferred tax liabilities: Investment basis difference (414) (414) Property and equipment (46,536) (45,995) Unrealized gain on derivative instruments, net (358) (244) Prepaid expenses and other (432) (497) Total deferred tax liabilities (47,740) (47,150) Net deferred tax liabilities $ (38,540) $ (26,453)
Schedule of Reconciliation of Income Taxes	These amounts are different from the amounts computed by applying the U.S. federal income tax rate for the period to pre-tax income as a result of the following ($ in thousands): Year Ended December 31, 2021 2020 2019 Tax benefit at U.S. statutory rate $ (64,705) $ (19,418) $ (7,747) Permanent differences and other 10,980 21,565 853 State income taxes, net of federal benefit (2,641) 1,463 (4,705) Income attributable to noncontrolling interest 95 95 (41) Partnership expenses, not subject to tax 48,444 — — Change in investment and foreign tax credits — 472 — Total tax (benefit) provision $ (7,827) $ 4,177 $ (11,640)

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Payment for Pension and Other Postretirement Benefits [Abstract]
Schedule of Changes in Projected Benefit Obligations and Changes in Plan Assets	Additional information about the fair value of the benefit plan assets, the components of net periodic cost, and the projected benefit obligation as of and during 2021 and 2020 are ($ in thousands). HG DB IMTT DB Other Total 2021 2020 2021 2020 2021 2020 2021 2020 Change in benefit obligation: Benefit obligation – beginning of year $ 58,740 $ 54,211 $ — $ 168,186 $ 3,149 $ 30,071 $ 61,889 $ 252,468 Service cost 790 711 — 4,778 28 1,052 818 6,541 Interest cost 1,421 1,692 — 5,172 65 944 1,486 7,808 Participant contributions — — — — 151 238 151 238 Actuarial (gains) losses (1,563) 4,845 — 21,362 (79) 2,127 (1,642) 28,334 Benefits paid (2,830) (2,719) — (10,909) (313) (1,154) (3,143) (14,782) Disposition of benefit obligation — — — (188,589) (235) (30,129) (235) (218,718) Benefit obligation – end of year $ 56,558 $ 58,740 $ — $ — $ 2,766 $ 3,149 $ 59,324 $ 61,889 Change in plan assets: Fair value of plan assets - beginning of year $ 55,976 $ 52,059 $ — $ 93,982 $ — $ 9,698 $ 55,976 $ 155,739 Actual return on plan assets 1,846 6,636 — 5,743 — 729 1,846 13,108 Employer contributions — — — — 162 562 162 562 Participant contributions — — — — 151 238 151 238 Benefits paid (2,830) (2,719) — (10,909) (313) (1,154) (3,143) (14,782) Disposition of plan asset due to sale of business — — — (88,816) — (10,073) — (98,889) Fair value of plan assets – end of year $ 54,992 $ 55,976 $ — $ — $ — $ — $ 54,992 $ 55,976
Funded Status	The funded status on December 31, 2021 and 2020 are presented in the following table ($ in thousands): HG DB IMTT DB Other Plan Total 2021 2020 2021 2020 2021 2020 2021 2020 Funded status Funded status at end of year $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) Net amount recognized in balance sheet $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) Amounts recognized in balance sheet consisting of: Current liabilities $ — $ — $ — $ — $ (243) $ (248) $ (243) $ (248) Noncurrent liabilities (1,566) (2,764) — — (2,523) (2,901) (4,089) (5,665) Net amount recognized in balance sheet $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913)
Schedule of Net Periodic Benefit Cost Not yet Recognized	Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss in 2021 and 2020 are presented in the following table ($ in thousands): HG DB IMTT DB Other Total 2021 2020 2021 2020 2021 2020 2021 2020 Prior service cost $ — $ — $ — $ — $ 18 $ (157) $ 18 $ (157) Accumulated loss (6,482) (7,836) — (40,496) (436) (6,540) (6,918) (54,872) Accumulated other comprehensive loss (6,482) (7,836) — (40,496) (418) (6,697) (6,900) (55,029) Net periodic benefit cost in excess (deficit) of cumulative employer contributions 4,916 5,072 — (59,277) (2,583) (16,508) 2,333 (70,713) Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business — — — 59,277 240 13,873 240 73,150 Reclassification to net income (loss) due to sale of business (1) — — — 40,496 (5) 6,183 (5) 46,679 Net amount recognized in balance sheet $ (1,566) $ (2,764) $ — $ — $ (2,766) $ (3,149) $ (4,332) $ (5,913) (1) Reclassified to discontinued operations in the consolidated statement of operations in connection with the IMTT and AA Transaction. See Note 4, "Discontinued Operations and Dispositions", for further discussions.
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)	The components of net periodic benefit cost and other changes in other comprehensive (income) loss for the plans are shown below ($ in thousands): HG DB Plan Benefits IMTT DB Other Plan Benefits Total 2021 2020 2019 2021 2020 2019 2021 2020 2019 2021 2020 2019 Components of net periodic benefit cost: Service cost $ 790 $ 711 $ 619 $ — $ 4,778 $ 4,512 $ 28 $ 1,052 $ 1,063 $ 818 $ 6,541 $ 6,194 Interest cost 1,421 1,692 2,032 — 5,172 6,000 65 944 1,145 1,486 7,808 9,177 Expected return on plan assets (2,426) (2,280) (2,189) — (4,755) (4,605) — (508) (460) (2,426) (7,543) (7,254) Recognized actuarial loss 371 306 705 — 443 — 33 193 99 404 942 804 Amortization of prior service (cost) credit — — — — — — (16) 2 2 (16) 2 2 Net periodic benefit cost $ 156 $ 429 $ 1,167 $ — $ 5,638 $ 5,907 $ 110 $ 1,683 $ 1,849 $ 266 $ 7,750 $ 8,923 Other changes recognized in other comprehensive (income) loss: Net (gain) loss arising during the year $ (983) $ 488 $ (1,439) $ — $ 20,374 $ 13,419 $ (79) $ 1,907 $ 736 $ (1,062) $ 22,769 $ 12,716 Amortization of prior service cost (credit) — — — — — — 16 (2) (2) 16 (2) (2) Amortization of loss (371) (306) (705) — (443) — (33) (193) (99) (404) (942) (804) Total recognized in other comprehensive (income) loss $ (1,354) $ 182 $ (2,144) $ — $ 19,931 $ 13,419 $ (96) $ 1,712 $ 635 $ (1,450) $ 21,825 $ 11,910 The assumptions used in accounting for the HG DB Plan Benefits, IMTT DB Plan Benefits, and Other Plan Benefits are: HG DB Plan Benefits IMTT DB Plan Benefits Other Plan Benefits 2021 2020 2019 2021 2020 2019 2021 2020 2019 Weighted average assumptions to determine benefit obligations: Discount rate 2.80 % 2.45 % 3.20 % N/A 2.60 % 3.25 % 1.73% to 2.55% 1.73% to 2.75% 2.82% to 3.35% Rate of compensation increase N/A N/A N/A N/A 4.57 % 4.57 % N/A 4.57 % (1) 4.57 % (1) Measurement date Dec 31 Dec 31 Dec 31 N/A Dec 23 Dec 31 Sep 23 - Dec 31 (2) Dec 23 - Dec 31 (3) Dec 31 Weighted average assumptions to determine net cost: Discount rate 2.45 % 3.20 % 4.25 % N/A 3.25 % 4.35 % 1.73% to 2.15% 2.82% to 3.35% 3.91% to 4.35% Expected long-term rate of return on plan assets during fiscal year 4.45 % 4.50 % 4.90 % N/A 5.50 % 5.50 % N/A 5.50 % (4) 5.50 % (4) Rate of compensation increase N/A N/A N/A N/A 4.57 % 4.57 % N/A 4.57 % (1) 4.57 % (1) Assumed healthcare cost trend rates: Initial health care cost trend rate 7.00 % 7.25 % 7.25% to 7.75% Ultimate rate 4.50 % 4.50 % 4.50% to 5.00% Year ultimate rate is reached 2030 2029 2027 to 2028 (1) Only applies to IMTT post-retirement life insurance plan. (2) Measurement date related to the AA post-retirement welfare benefits was September 23, 2021. (3) Measurement date related to the IMTT post-retirement life insurance plan and IMTT-Illinois Union Plan was December 23, 2020. (4) Only applies to IMTT-Illinois Union Plan.
Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The estimated amounts that will be amortized from accumulated other comprehensive loss over the next year are presented in the following table ($ in thousands): HG DB Plan Benefits Other Plan Benefits Total 2021 2020 2021 2020 2021 2020 Amortization of prior service cost $ — $ — $ (16) $ (15) $ (16) $ (15) Amortization of net loss 126 282 15 22 141 304
DB Plan Weighted Average Asset Allocation	The asset allocation on December 31, 2021 and 2020 were: HG DB 2021 2020 Equity securities 37 % 25 % Fixed income securities 57 % 70 % Global real estate fund 5 % 4 % Cash 1 % 1 % Total 100 % 100 %
Schedule of Allocation of Plan Assets	The expected returns on plan assets were estimated based on the allocation of assets and management’s expectations regarding future performance of the investments held in the investment portfolios. The asset allocations as of December 31, 2021 and 2020 measurement dates were ($ in thousands): Fair Value Measurement on December 31, 2021 Total Quoted Prices in Active Significant Significant Asset category: Cash and money market $ 725 $ 725 $ — $ — Equity securities 20,114 — 20,114 — Fixed income securities 31,219 — 31,219 — Global real estate fund 2,934 — 2,934 — Total $ 54,992 $ 725 $ 54,267 $ — Fair Value Measurement on December 31, 2020 Total Quoted Prices Significant Significant Asset category: Cash and money market $ 489 $ 489 $ — $ — Equity securities 14,276 — 14,276 — Fixed income securities 39,115 — 39,115 — Global real estate fund 2,096 — 2,096 — Total $ 55,976 $ 489 $ 55,487 $ —
Estimated Future Benefit Payments	The estimated future benefit payments for the next ten years are ($ in thousands): 2022 $ 3,299 2023 3,328 2024 3,330 2025 3,370 2026 3,390 Thereafter 17,033 Total $ 33,750

Quarterly Data (Unaudited) (Tab

Quarterly Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Data	The following table represents the summary of financial data from both continuing and discontinued operations for the quarters related to the years ended December 31, 2021 and 2020. Quarter ended March 31 June 30 September 30 December 31 (In Thousands, except per unit data) 2021 Revenue from continuing operations $ 54,587 $ 58,740 $ 60,086 $ 62,571 Operating loss from continuing operations (1,070) (5,628) (282,344) (4,959) Net loss from continuing operations attributable to MIH (6,867) (15,124) (274,637) (3,857) Net income (loss) from discontinued operations attributable to MIH 20,067 22,473 2,954,444 (12,631) Per unit information attributable to MIH (1) : Basic loss per unit from continuing operations attributable to MIH $ (0.08) $ (0.18) $ (3.12) $ (0.05) Basic income (loss) per unit from discontinued operations attributable to MIH 0.23 0.26 33.61 (0.14) Basic income (loss) per unit attributable to MIH 0.15 0.08 30.49 (0.19) Diluted loss per unit from continuing operations attributable to MIH $ (0.08) $ (0.18) $ (3.12) $ (0.05) Diluted income (loss) per unit from discontinued operations attributable to MIH 0.23 0.26 33.61 (0.14) Diluted income (loss) per unit attributable to MIH 0.15 0.08 30.49 (0.19) Cash distribution declared per unit $ — $ — $ 37.386817 $ — 2020 Revenue from continuing operations $ 60,462 $ 36,795 $ 39,036 $ 44,118 Operating (loss) income from continuing operations (11,175) 266 (5,960) (52,832) Net loss from continuing operations attributable to MIH (18,003) (2,280) (5,368) (71,131) Net income (loss) from discontinued operations attributable to MIH 29,305 (5,674) (887,880) 33,170 Per unit information attributable to MIH (1) : Basic loss per unit from continuing operations attributable to MIH $ (0.21) $ (0.02) $ (0.06) $ (0.82) Basic income (loss) per unit from discontinued operations attributable to MIH 0.34 (0.07) (10.20) 0.38 Basic income (loss) per unit attributable to MIH 0.13 (0.09) (10.26) (0.44) Diluted loss per unit from continuing operations attributable to MIH $ (0.21) $ (0.02) $ (0.06) $ (0.82) Diluted income (loss) per unit from discontinued operations attributable to MIH 0.34 (0.07) (10.20) 0.38 Diluted income (loss) per unit attributable to MIH 0.13 (0.09) (10.26) (0.44) Cash distribution declared per unit $ — $ — $ — $ 11.00 (1) Due to averaging of units, quarterly earnings per unit may not sum to the totals reported for the full year.

Organization and Description _2

Organization and Description of Business (Details) $ / shares in Units, $ in Thousands	Oct. 07, 2021$ / shares	Sep. 23, 2021USD ($)	Sep. 22, 2021	Jun. 14, 2021USD ($)$ / shares	Dec. 31, 2020USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jun. 07, 2021USD ($)	Oct. 31, 2019business
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating businesses | business										3
Disposition payment					$ 28,200	$ 228,570	$ 28,174	$ 0
Conversion of stock, conversion ratio			1
AMF Hawaii Holdings, LLC | Completion Date July 1, 2022 Or Earlier | MIC Hawaii Holdings, LLC
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares				$ 3.83
AMF Hawaii Holdings, LLC | Completion Date After July 1, 2022 | MIC Hawaii Holdings, LLC
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares				$ 4.11
Disposal Group, Held-for-sale, Not Discontinued Operations | Atlantic Aviation Business
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Consideration from sale of business									$ 4,475,000
Discontinued Operations, Disposed of by Sale | Atlantic Aviation Business
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Consideration from sale of business		$ 4,475,000
Disposition payment		228,600
Proceeds from divestiture of business		$ 3,525,000
Special dividend (in dollars per share) | $ / shares	$ 37.386817
Completion Date July 1, 2022 Or Earlier | Disposal Group, Held-for-sale, Not Discontinued Operations | MIC Hawaii Holdings, LLC
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Disposition payment				$ 81,700
Completion Date After July 1, 2022 | Disposal Group, Held-for-sale, Not Discontinued Operations | MIC Hawaii Holdings, LLC
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Disposition payment				$ 56,700

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Commercial paper, at carrying value	$ 0	$ 0
Inventory net, held for sale	4,600,000	2,300,000
Inventory net, materials and supplies	$ 7,100,000	7,300,000
Finite-Lived intangible asset, useful life	20 years
Weighted average remaining life of deferred financing costs	2 years 10 months 24 days
Accrued expenses	$ 18,449,000	$ 17,798,000
Intermediate Holding Company
Significant Accounting Policies [Line Items]
Percentage of owned subsidiaries	80.00%
Minimum
Significant Accounting Policies [Line Items]
Debt issuance costs amortized period	4 years
Maximum
Significant Accounting Policies [Line Items]
Debt issuance costs amortized period	10 years
Hawaii | Maximum | Buildings
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	68 years
Hawaii | Maximum | Machinery and equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	68 years
Hawaii | Maximum | Furniture and fixtures
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	68 years
Hawaii | Maximum | Leaseholds and Leasehold Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	68 years

Impact of COVID-19 (Details)

Impact of COVID-19 (Details) - visitor visitor in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Impact of COVID-19 [Line Items]
Reduction of number of visitor arrivals to Hawaii for period two years prior current period	25.00%		35.00%
Hawaii
Impact of COVID-19 [Line Items]
Number of visitor arrivals to Hawaii during period	1,900	497	6,800	2,700
Increase in gas consumption for quarter period one year prior current period	29.00%		21.00%
Gas reduction for quarter period two years prior current period	6.00%		11.00%

Discontinued Operations and D_3

Discontinued Operations and Dispositions - Narrative (Details) $ / shares in Units, $ in Thousands	Oct. 07, 2021$ / shares	Sep. 23, 2021USD ($)	Dec. 23, 2020USD ($)$ / shares	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Dec. 31, 2018MW	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Oct. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition payment				$ 28,200				$ 228,570	$ 28,174	$ 0
2.00% Convertible Senior Notes due October 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest rate, stated percentage								2.00%			2.00%
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs on business disposal						$ 9,700
Accrued income tax payable, current										41,700
Discontinued Operations, Disposed of by Sale | Solar Generating Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capacity of plant | MW							142
Discontinued Operations, Disposed of by Sale | Wind Generation Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capacity of plant | MW							203
Discontinued Operations, Disposed of by Sale | Solar and Wind Facilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business						81,700
Purchase price of business sold, gross						275,200
Debt assumed by buyer from divestiture of business						295,100
Cash consideration from divestiture of businesses net of transaction costs and taxes						$ 223,800
Atlantic Aviation Business | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration from sale of business		$ 4,475,000
Proceeds from divestiture of business		3,525,000
Disposition payment		228,600
Special dividend (in dollars per share) | $ / shares	$ 37.386817
Gain (loss) on disposition of business		2,950,000
Transaction costs on business disposal		$ 50,200
IMTT | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition payment			$ 28,200
Special dividend (in dollars per share) | $ / shares			$ 11
Gain (loss) on disposition of business			$ 25,000						(69,600)
Transaction costs on business disposal			28,500
Purchase price of business sold, gross			2,670,000
Consideration including debt outstanding and cash			1,110,000
Proceeds from divestiture of business, net			$ 1,550,000
Impairment					$ 750,000				750,000	$ 0
Goodwill impairment					725,000
Deferred tax liability due to book vs tax basis					$ 158,000
Accrued income tax payable, current				$ 126,200					$ 126,200

Discontinued Operations and D_4

Discontinued Operations and Dispositions - Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Assets
Total current assets	[1]	$ 0	$ 2,185,002
Liabilities
Total current liabilities	[1]	$ 0	1,613,830
Atlantic Aviation Business | Discontinued Operations, Disposed of by Sale
Assets
Cash and cash equivalents			309,955
Restricted cash			10,121
Accounts receivable, net of allowance for doubtful accounts			23,749
Other current assets			20,583
Total current assets			364,408
Property, equipment, land, and leasehold improvements, net			556,825
Operating lease assets, net			313,014
Goodwill			496,746
Intangible assets, net			452,664
Other noncurrent assets			1,345
Total assets			2,185,002
Liabilities
Accounts payable and accrued expenses			45,702
Current portion of long-term debt			10,250
Operating lease liabilities - current			15,138
Income taxes payable, net			132,113
Other current liabilities			13,270
Total current liabilities			216,473
Long-term debt, net of current portion			976,190
Deferred income taxes			100,405
Operating lease liabilities - noncurrent			303,728
Other noncurrent liabilities			17,034
Total liabilities			$ 1,613,830
[1]	See Note 4, “Discontinued Operations and Dispositions”, for further discussions on assets and liabilities held for sale.

Discontinued Operations and D_5

Discontinued Operations and Dispositions - Statement of Operations (Details) - USD ($) $ in Thousands		Sep. 23, 2021	Dec. 23, 2020	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income from discontinued operations before income taxes	[1]											$ 3,050,811	$ (684,660)	$ 261,451
Provision for income taxes	[1]											(66,458)	(146,419)	(83,046)
Net income (loss) from discontinued operations	[1]											2,984,353	(831,079)	178,405
Less: net loss attributable to noncontrolling interests												0	0	(3,109)
Net income (loss) from discontinued operations attributable to MIH				$ (12,631)	$ 2,954,444	$ 22,473	$ 20,067	$ 33,170	$ (887,880)	$ (5,674)	$ 29,305	2,984,353	(831,079)	181,514
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of services														(7,389)
Selling, general and administrative expenses														(19,148)
Depreciation and amortization														(608)
Interest expense, net														(12,888)
Other (expense) income, net														81,156
Net income from discontinued operations before income taxes														85,534
Provision for income taxes														(32,803)
Net income (loss) from discontinued operations														52,731
Less: net loss attributable to noncontrolling interests														(3,109)
Net income (loss) from discontinued operations attributable to MIH														55,840
Atlantic Aviation Business | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of services												(286,078)	(238,599)	(448,136)
Selling, general and administrative expenses												(195,677)	(249,879)	(263,255)
Depreciation and amortization												(69,792)	(100,112)	(106,255)
Interest expense, net												(32,036)	(64,987)	(76,856)
Gain on sale of business												2,953,873	0	0
Other income, net												2,036	323	3,005
Net income from discontinued operations before income taxes												3,050,811	13,816	77,701
Provision for income taxes												(66,458)	(122,642)	(26,377)
Net income (loss) from discontinued operations attributable to MIH												2,984,353	(108,826)	51,324
Gain (loss) on disposition of business		$ 2,950,000
IMTT | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of services													(192,884)	(204,146)
Selling, general and administrative expenses													(38,094)	(33,158)
Impairment									$ (750,000)				(750,000)	0
Depreciation and amortization													(102,193)	(132,768)
Interest expense, net													(42,715)	(47,930)
Other (expense) income, net													(60,874)	1,116
Net income from discontinued operations before income taxes													(698,476)	98,216
Provision for income taxes													(23,777)	(23,866)
Net income (loss) from discontinued operations attributable to MIH													(722,253)	74,350
Gain (loss) on disposition of business			$ 25,000										(69,600)
Bayonne Energy Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business														80,200
Service revenue | Atlantic Aviation Business | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue												$ 678,485	667,070	969,198
Service revenue | IMTT | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue													$ 488,284	515,102
Product revenue | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue														$ 44,411
[1]	See Note 4, “Discontinued Operations and Dispositions”, for further discussions on businesses classified as held for sale.

Leases - Narrative (Details)

Leases - Narrative (Details) - renewal_option	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Leased Assets [Line Items]
Term of contract	12 months
Number of renewal options	1
Weighted average remaining lease term	10 years	9 years 8 months 12 days	9 years 9 months 18 days
Discount rate	5.30%	4.80%	4.70%
Minimum
Operating Leased Assets [Line Items]
Renewal term	1 year
Maximum
Operating Leased Assets [Line Items]
Renewal term	10 years

Leases - Consolidated Statement

Leases - Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Leased Assets [Line Items]
Total operating lease expense	$ 2,511	$ 2,549	$ 2,535
Operating lease, expense, leases less than one year	105	105	179
Operating lease, expense, variable leases	323	345	330
Selling, general and administrative
Operating Leased Assets [Line Items]
Total operating lease expense	244	248	240
Product revenue | Cost of product sales
Operating Leased Assets [Line Items]
Total operating lease expense	$ 2,267	$ 2,301	$ 2,295

Leases - Future Maturities of L

Leases - Future Maturities of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2021USD ($)
Leases [Abstract]
2022	$ 2,350
2023	2,230
2024	1,990
2025	1,731
2026	1,672
Thereafter	6,936
Total lease payment	16,909
Less: interest	(4,305)
Present value of lease liability	$ 12,604

Income per Unit - Schedule of R

Income per Unit - Schedule of Reconciliation of the Basic and Diluted Income (Loss) per Unit Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Basic net loss from continuing operations attributable to MIH									$ (300,485)	$ (96,782)	$ (25,006)
Diluted net loss from continuing operations attributable to MIH									(300,485)	(96,782)	(25,006)
Basic net income (loss) from discontinued operations attributable to MIH									2,984,353	(831,079)	181,514
Diluted net income (loss) from discontinued operations attributable to MIH									$ 2,984,353	$ (831,079)	$ 181,514
Denominator:
Weighted average number of units outstanding: basic (in shares)									87,791,951	86,951,642	86,178,212
Weighted average number of units outstanding: diluted (in shares)									87,791,951	86,951,642	86,178,212
Income per unit:
Basic loss per unit from continuing operations attributable to MIH (in dollars per share)	$ (0.05)	$ (3.12)	$ (0.18)	$ (0.08)	$ (0.82)	$ (0.06)	$ (0.02)	$ (0.21)	$ (3.42)	$ (1.11)	$ (0.29)
Basic income (loss) per unit from discontinued operations attributable to MIH (in dollars per share)	(0.14)	33.61	0.26	0.23	0.38	(10.20)	(0.07)	0.34	33.99	(9.56)	2.11
Basic income (loss) per unit attributable to MIH (in dollars per share)	(0.19)	30.49	0.08	0.15	(0.44)	(10.26)	(0.09)	0.13	30.57	(10.67)	1.82
Diluted loss per unit from continuing operations attributable to MIH (in dollars per share)	(0.05)	(3.12)	(0.18)	(0.08)	(0.82)	(0.06)	(0.02)	(0.21)	(3.42)	(1.11)	(0.29)
Diluted income (loss) income per unit from discontinued operations attributable to MIH (in dollars per share)	(0.14)	33.61	0.26	0.23	0.38	(10.20)	(0.07)	0.34	33.99	(9.56)	2.11
Diluted income (loss) income per unit attributable to MIH (in dollars per share)	$ (0.19)	$ 30.49	$ 0.08	$ 0.15	$ (0.44)	$ (10.26)	$ (0.09)	$ 0.13	$ 30.57	$ (10.67)	$ 1.82

Income per Unit - Schedule of S

Income per Unit - Schedule of Shares Excluded from Calculation (Details) - USD ($) $ in Thousands	Oct. 22, 2021	Mar. 16, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 15, 2019	Oct. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)			1,798,388	3,742,933	4,981,505
Debt repurchased			$ 496,629	$ 1,260	$ 727
2.00% Convertible Senior Notes due October 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate, stated percentage			2.00%				2.00%
Debt repurchased	$ 26,900	$ 358,600	$ 395,700
Restricted unit grants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)			109,185	108,760	26,089
2.875% Convertible Senior Notes due July 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)			0	0	1,321,243
Interest rate, stated percentage			2.875%			2.875%
2.00% Convertible Senior Notes due October 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)			1,689,203	3,634,173	3,634,173
Interest rate, stated percentage			2.00%

Property, Equipment, Land and_3

Property, Equipment, Land and Leasehold Improvements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 427,117	$ 413,243
Less: accumulated depreciation	(129,927)	(115,868)
Property, equipment, land, and leasehold improvements, net	297,190	297,375
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,710	10,710
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,427	4,142
Leasehold and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,003	19,824
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	376,924	363,379
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,740	3,664
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,313	$ 11,524

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 16,000	$ 16,000
Less: accumulated amortization	(11,502)	(11,077)
Intangible assets, net	4,498	4,923
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	7,400	7,400
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	8,500	8,500
Leasehold rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 100	$ 100

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite lived trade names net	$ 4,498
Amortization of intangibles	425	$ 425	$ 425
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite lived trade names net	$ 4,500

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Schedule of Estimated Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2022	$ 425
2023	425
2024	425
2025	425
2026	425
Thereafter	2,373
Total	$ 4,498

Intangible Assets and Goodwil_5

Intangible Assets and Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Goodwill [Line Items]
Goodwill acquired in business combinations, net of disposals, on December 31, 2020	$ 743,932
Accumulated impairment charges	(126,415)
Other	(578)
Transfer to asset held for sale	(496,746)
Goodwill	120,193	$ 120,193
Atlantic Aviation
Goodwill [Line Items]
Goodwill acquired in business combinations, net of disposals, on December 31, 2020	620,599
Accumulated impairment charges	(123,200)
Other	(653)
Transfer to asset held for sale	(496,746)
Goodwill	0	0
Hawaii
Goodwill [Line Items]
Goodwill acquired in business combinations, net of disposals, on December 31, 2020	123,333
Accumulated impairment charges	(3,215)
Other	75
Transfer to asset held for sale	0
Goodwill	$ 120,193	$ 120,193

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details)	Oct. 22, 2021USD ($)	Apr. 19, 2021USD ($)	Mar. 16, 2021USD ($)	Jan. 01, 2021USD ($)	Feb. 10, 2016USD ($)	Oct. 31, 2016USD ($)	Jul. 31, 2016USD ($)	Dec. 31, 2021USD ($)extension	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jan. 18, 2021USD ($)
Debt Instrument [Line Items]
Debt outstanding								$ 99,519,000	$ 585,010,000
Unamortized deferred financing costs								757,000	5,781,000
Issuance costs										$ 95,000
Debt repurchased								496,629,000	1,260,000	727,000
Write-off of debt financing cost								$ 4,170,000	0	0
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Debt Instrument [Line Items]
Balance as of period date									7,000,000
Minimum
Debt Instrument [Line Items]
Debt instrument, term								4 years
Maximum
Debt Instrument [Line Items]
Debt instrument, term								7 years
2.00% Convertible Senior Notes due October 2023
Debt Instrument [Line Items]
Debt instrument, term						7 years
Interest rate, stated percentage						2.00%		2.00%
Convertible senior notes						$ 402,500,000		$ 6,821,000	402,500,000
Debt outstanding						$ 375,800,000		6,821,000	391,252,000
Interest rate, effective						3.10%
Equity component of convertible senior notes (reversal of equity component of convertible senior notes)						$ 26,700,000			26,748,000
Unamortized deferred financing costs						11,200,000		0	4,134,000
Issuance costs						$ 744,000
Fair value of convertible senior notes									390,000,000
Debt repurchased	$ 26,900,000		$ 358,600,000					395,700,000
Transaction cost								1,200,000
Write-off of debt financing cost			$ 3,700,000					4,016,000	0	$ 0
Debt instrument, fair value disclosure								$ 6,800,000
Conversion rate								0.1629223
2.00% Convertible Senior Notes due October 2023 | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Equity component of convertible senior notes (reversal of equity component of convertible senior notes)				$ (26,700,000)
Revolving Credit Facility
Debt Instrument [Line Items]
Facilities											$ 600,000,000
Term Loan Facility | Solar Power Facilities | Hawaii
Debt Instrument [Line Items]
Debt instrument, term							10 years
Debt outstanding								$ 12,700,000	13,800,000
Facilities							$ 18,000,000
Fixed portion of interest rate component							2.00%
Term Loan Facility | Interest Rate Swap | Solar Power Facilities | Hawaii
Debt Instrument [Line Items]
Weighted average interest rate								3.38%
Hawaii | Senior Notes
Debt Instrument [Line Items]
Transaction cost		$ 4,700,000
Write-off of debt financing cost		154,000
Debt instrument, fair value disclosure									105,000,000
Long-term debt									100,000,000
Debt repurchased, face amount		$ 100,000,000
Hawaii | Revolving Credit Facility
Debt Instrument [Line Items]
Facilities					$ 60,000,000			$ 60,000,000	$ 60,000,000
Hawaii | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Fixed portion of interest rate component					1.00%
Hawaii | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Fixed portion of interest rate component					1.75%
Hawaii | Term Loan Facility
Debt Instrument [Line Items]
Facilities					$ 80,000,000			$ 80,000,000
Fixed portion of interest rate component								1.25%
Number of extensions | extension								2
Extension term								1 year
Hawaii | Term Loan Facility | Interest Rate Swap
Debt Instrument [Line Items]
Fixed interest rate					0.99%
Weighted average interest rate								3.38%
Hawaii | Term Loan Facility | Minimum
Debt Instrument [Line Items]
Fixed portion of interest rate component					1.00%
Hawaii | Term Loan Facility | Maximum
Debt Instrument [Line Items]
Fixed portion of interest rate component					1.75%

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2016
Debt Instrument [Line Items]
Long-term debt, net of unamortized debt discount	$ 99,519	$ 585,010
Current portion	(1,107)	(1,060)
Long-term portion	98,412	583,950
Unamortized deferred financing costs	(757)	(5,781)
Long-term portion less unamortized debt discount and deferred financing costs	$ 97,655	578,169
Weighted average remaining life of deferred financing costs	2 years 10 months 24 days
Loans Payable | Term Loan - Hawaii Gas
Debt Instrument [Line Items]
Long-term debt, net of unamortized debt discount	$ 80,000	180,000
Loans Payable | Term Loan - Solar Facilities in Hawaii
Debt Instrument [Line Items]
Long-term debt, net of unamortized debt discount	$ 12,698	13,758
2.00% Convertible Senior Notes due October 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%		2.00%
Long-term debt, net of unamortized debt discount	$ 6,821	391,252	$ 375,800
Unamortized deferred financing costs	0	(4,134)	$ (11,200)
Long-term portion less unamortized debt discount and deferred financing costs	$ 6,821	$ 387,118

Long-Term Debt - Schedule of Fu

Long-Term Debt - Schedule of Future Maturities of Long-Term Debt (Details) $ in Thousands	Dec. 31, 2021USD ($)
Debt Disclosure [Abstract]
2022	$ 1,107
2023	7,976
2024	81,204
2025	1,258
2026	7,974
Thereafter	0
Total	$ 99,519

Long-Term Debt - Schedule of 2.

Long-Term Debt - Schedule of 2.00% Convertible Senior Notes (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2016	Dec. 31, 2020	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, net of unamortized debt discount		$ 585,010	$ 99,519
Unamortized debt financing costs		(5,781)	(757)
Long-term portion less unamortized debt discount and deferred financing costs		578,169	$ 97,655
2.00% Convertible Senior Notes due October 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%		2.00%
Principal	$ 402,500	402,500	$ 6,821
Unamortized debt discount		(11,248)	0
Long-term debt, net of unamortized debt discount	375,800	391,252	6,821
Unamortized debt financing costs	(11,200)	(4,134)	0
Long-term portion less unamortized debt discount and deferred financing costs		387,118	$ 6,821
Equity Component	$ 26,700	$ 26,748

Long-Term Debt - Schedule of In

Long-Term Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	Mar. 16, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2016
Debt Instrument [Line Items]
Amortization of debt financing cost		$ 738	$ 5,744	$ 5,626
Write-off of debt financing cost		$ 4,170	0	0
2.00% Convertible Senior Notes due October 2023
Debt Instrument [Line Items]
Interest rate, stated percentage		2.00%			2.00%
Contractual interest expense		$ 2,171	8,050	8,050
Amortization of debt discount		0	3,858	3,741
Amortization of debt financing cost		413	1,503	1,503
Write-off of debt financing cost	$ 3,700	4,016	0	0
Total interest expense		$ 6,600	$ 13,411	$ 13,294

Long-Term Debt - Key Terms of 2

Long-Term Debt - Key Terms of 2.00% Convertible Senior Note (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2016
Debt Instrument [Line Items]
Long-term debt, net of unamortized debt discount	$ 99,519	$ 585,010
2.00% Convertible Senior Notes due October 2023
Debt Instrument [Line Items]
Long-term debt, net of unamortized debt discount	$ 6,821	$ 391,252	$ 375,800
Interest rate, stated percentage	2.00%		2.00%

Long-Term Debt - Key Terms of T

Long-Term Debt - Key Terms of Term Loan, Senior Notes and Revolving Credit Facility of Hawaii Gas (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 18, 2021	Dec. 31, 2020	Feb. 10, 2016
Term Loan Facility | Hawaii
Debt Instrument [Line Items]
Facilities	$ 80,000,000			$ 80,000,000
Interest Rate	1.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Facilities		$ 600,000,000
Revolving Credit Facility | Hawaii
Debt Instrument [Line Items]
Facilities	$ 60,000,000		$ 60,000,000	$ 60,000,000
Commitment Fees	0.175%
Revolving Credit Facility | Hawaii | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest Rate	1.00%

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Narrative (Details) - Hawaii gal in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2016	Dec. 31, 2021gal	Jan. 31, 2020USD ($)
Term Loan Facility
Derivative [Line Items]
Fixed portion of interest rate component		1.25%
Term Loan Facility | Solar Power Facilities
Derivative [Line Items]
Debt instrument, term	10 years
Fixed portion of interest rate component	2.00%
Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative | $			$ 80
Interest Rate Swap | Term Loan Facility
Derivative [Line Items]
Weighted average interest rate		3.38%
Commodity Price Hedges | Hawaii | MIC Hawaii Holdings, LLC
Derivative [Line Items]
Nonmonetary notional amount, volume | gal		60.7

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of derivative instruments - other current assets	$ 909	$ 935
Fair value of derivative instruments - other noncurrent assets	470	0
Total derivative contracts - assets	1,379	935
Fair value of derivative instruments - other current liabilities	(122)	(172)
Fair value of derivative instruments - other noncurrent liabilities	0	(449)
Total derivative contracts - liabilities	$ (122)	$ (621)

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Schedule of Location of Hedging Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ 6,279	$ (29)	$ (10,957)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	333	(912)	(875)
Interest Expense | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	333	(912)	(875)
Cost of product sales | Commodity swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ 5,946	$ 883	$ (10,082)

Unitholders_ Equity - Narrative

Unitholders’ Equity - Narrative (Details)	Sep. 23, 2021USD ($)shares	Dec. 23, 2020USD ($)shares	Jun. 30, 2021shares	Dec. 31, 2021USD ($)directorshares	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Feb. 22, 2022shares	Mar. 31, 2019	Mar. 28, 2019shares	Mar. 27, 2019shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common units, shares authorized (in shares)				500,000,000	500,000,000	500,000,000
Special units, shares authorized (in shares)				100
Special units, shares issued (in shares)				100	100
Special units, shares outstanding (in shares)				100	100
Preferred units, shares authorized (in shares)				100,000,000	100,000,000
Common units, shares issued (in shares)				88,343,762	87,361,929
Common units, shares outstanding (in shares)				88,343,762	87,361,929
Preferred units, shares issued (in shares)				0	0
Preferred units, shares outstanding (in shares)				0	0
2014 Independent Director Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)				227,832
Fair value of awards granted | $				$ 350,000
2014 Independent Director Equity Plan | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							2,481,999
2014 Independent Director Equity Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized				370,668
2016 Omnibus Employee Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)									1,500,000	500,000
2016 Omnibus Employee Incentive Plan | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							19,259,340
2019 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award performance period				3 years
Make Whole For Special Dividend, Units | 2014 Independent Director Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized			70,668
Director Share Units | 2014 Independent Director Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense | $				$ 1,300,000	$ 880,000	$ 963,000
STIP Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense | $	$ 965,000	$ 398,000
STIP Grants | 2019 Short Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense | $				$ 2,100,000	$ 1,100,000	$ 0
Percentage of cash component incentive award								75.00%
Percentage of stock component incentive award								25.00%
Share-based payment award performance period				1 year
Award vesting period				2 years
Fair value of awards granted | $				$ 628,000
Period for recognition, cost not yet recognized				1 year
Options, nonvested (in shares)				251,649	34,627	0
Forfeited in period (shares)				215	1,468
STIP Grants | 2019 Short Term Incentive Plan | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				50.00%
STIP Grants | 2019 Short Term Incentive Plan | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				50.00%
LTIP Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense | $	$ (1,700,000)	$ (540,000)		$ 5,700,000	$ 2,100,000	$ 911,000
Period for recognition, cost not yet recognized				1 year 4 months 24 days
Shares granted in period fair value at target | $				$ 2,900,000
Cost not yet recognized, amount | $				$ 1,300,000
Forfeited in period (shares)	85,962	13,549
LTIP Grants | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, nonvested (in shares)				1,846,051
LTIP Grants | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, nonvested (in shares)				0
LTIP Grants | 2019 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, nonvested (in shares)				1,054,886	71,521	125,194
Forfeited in period (shares)				86,384	18,965
Special RSU Grants | 2019 Short Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense | $				$ 200,000	$ 152,000	$ 0
Options, nonvested (in shares)				0	4,967	6,067
Management | Special Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Right to appoint number of directors | director				1

Unitholders_ Equity - Schedule

Unitholders’ Equity - Schedule of Dividends (Details) - $ / shares	Sep. 23, 2021	Dec. 23, 2020	Feb. 14, 2020	Oct. 29, 2019	Jul. 30, 2019	Apr. 29, 2019	Feb. 14, 2019
Equity [Abstract]
Dividends per share (in dollars per share)	$ 37.386817	$ 11	$ 1	$ 1	$ 1	$ 1	$ 1

Unitholders_ Equity - Schedul_2

Unitholders’ Equity - Schedule of Stock Issued to Board of Directors (Details) - 2014 Independent Director Equity Plan - $ / shares	May 19, 2021	Mar. 09, 2021	May 14, 2020	May 15, 2019
Range Three
Share-based Goods and Nonemployee Services Transaction [Line Items]
Units Granted (in shares)				21,390
Price of Stock Units Granted (in dollars per share)				$ 42.01
Range Four
Share-based Goods and Nonemployee Services Transaction [Line Items]
Units Granted (in shares)			32,112
Price of Stock Units Granted (in dollars per share)			$ 27.43
Range Five
Share-based Goods and Nonemployee Services Transaction [Line Items]
Units Granted (in shares)		12,024
Price of Stock Units Granted (in dollars per share)		$ 30.48
Range Six
Share-based Goods and Nonemployee Services Transaction [Line Items]
Units Granted (in shares)	25,974
Price of Stock Units Granted (in dollars per share)	$ 34.90

Unitholders_ Equity - Schedul_3

Unitholders’ Equity - Schedule of Unvested Stock Unit (Details) - $ / shares	Sep. 23, 2021	Dec. 23, 2020	Jan. 31, 2021	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
STIP Grants | 2019 Short Term Incentive Plan
Number of Units
Unvested beginning balance (in shares)			34,627		34,627	34,627	0
Granted (in shares)						286,013	55,661
Forfeited (in shares)						(215)	(1,468)
Vested (in shares)						(68,776)	(19,566)
Unvested ending balance (in shares)				251,649		251,649	34,627
Weighted Average Grant-Date Fair Value
Unvested beginning balance (in dollars per share)			$ 24.50		$ 24.50	$ 24.50	$ 0
Granted (in dollars per share)						4.89	24.50
Forfeited (in dollars per share)						24.92	24.50
Vested (in dollars per share)						31.03	32.57
Unvested ending balance (in dollars per share)				$ 2.49		$ 2.49	$ 24.50
Make Whole Grant For Special Dividend, STIP Grants | 2019 Short Term Incentive Plan
Number of Units
Granted (in shares)					12,614
Make Whole Grant Related To Atlantic Aviation Transaction, STIP Grants | 2019 Short Term Incentive Plan
Number of Units
Granted (in shares)				228,943
Special RSU Grants | 2019 Short Term Incentive Plan
Number of Units
Unvested beginning balance (in shares)			4,967		4,967	4,967	6,067
Granted (in shares)						1,860	4,602
Vested (in shares)						(6,827)	(5,702)
Unvested ending balance (in shares)				0		0	4,967
Weighted Average Grant-Date Fair Value
Unvested beginning balance (in dollars per share)			$ 40.30		$ 40.30	$ 40.30	$ 40.30
Granted (in dollars per share)						0	23.50
Vested (in dollars per share)						29.32	26.74
Unvested ending balance (in dollars per share)				$ 0		$ 0	$ 40.30
Make Whole Grant For Special Dividend, Special RSU Grants | 2019 Short Term Incentive Plan
Number of Units
Granted (in shares)					1,860
LTIP Grants
Number of Units
Forfeited (in shares)	(85,962)	(13,549)
LTIP Grants | 2019 Long Term Incentive Plan
Number of Units
Unvested beginning balance (in shares)			71,521		71,521	71,521	125,194
Granted (in shares)						1,205,242
Forfeited (in shares)						(86,384)	(18,965)
Vested (in shares)						(135,493)	(34,708)
Unvested ending balance (in shares)				1,054,886		1,054,886	71,521
Weighted Average Grant-Date Fair Value
Unvested beginning balance (in dollars per share)			$ 39.47		$ 39.47	$ 39.47	$ 39.62
Granted (in dollars per share)						5.73
Forfeited (in dollars per share)						31.39	39.70
Vested (in dollars per share)						37.93	39.88
Unvested ending balance (in dollars per share)				$ 2.76		$ 2.76	$ 39.47
Make Whole Grant For Special Dividend, LTIP Grants | 2019 Long Term Incentive Plan
Number of Units
Granted (in shares)			26,004
Make Whole Grant Related To Atlantic Aviation Transaction, LTIP Grants | 2019 Long Term Incentive Plan
Number of Units
Granted (in shares)				959,700

Unitholders' Equity - Schedule

Unitholders' Equity - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Change in post retirement benefit plans	[1]	$ 1,075	$ (15,723)	$ (8,533)
Translation adjustment	[2]	0	1,141	1,932
Reclassification to net income (loss) due to sale of business	[3]	(6)	45,279	0
Other comprehensive income (loss), tax benefit		375	6,100	3,400
Translation adjustment, tax expense			444	751
Total Unitholders’ Accumulated Other Comprehensive Loss, net of taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		(6,175)	(36,872)	(30,271)
Balance		(5,106)	(6,175)	(36,872)
Post-Retirement Benefit Plans, net of taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		(6,175)	(24,155)	(15,622)
Change in post retirement benefit plans		1,075	(15,723)	(8,533)
Translation adjustment			0	0
Reclassification to net income (loss) due to sale of business		(6)	33,703
Balance		(5,106)	(6,175)	(24,155)
Translation Adjustment, net of taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		0	(12,717)	(14,649)
Change in post retirement benefit plans		0	0	0
Translation adjustment			1,141	1,932
Reclassification to net income (loss) due to sale of business		0	11,576
Balance		$ 0	$ 0	$ (12,717)
[1]	Change in post-retirement benefit plans is presented net of tax benefit of $375,000, $6.1 million, and $3.4 million in 2021, 2020, and 2019, respectively. See Note 11, “Unitholders’ Equity”, for further discussions.
[2]	Translation adjustment is presented net of tax expense of $444,000 and $751,000 in 2020 and 2019, respectively. See Note 11, “Unitholders’ Equity”, for further discussions.
[3]	Reclassified to discontinued operations in the consolidated statement of operations in connection with the AA transaction in 2021 and the IMTT Transaction in 2020. See Note 4, "Discontinued Operations and Dispositions", for further discussions.

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - MIC Hawaii Holdings, LLC	12 Months Ended
	Dec. 31, 2021facility
Disaggregation of Revenue [Line Items]
Number of solar projects	2
Minimum
Disaggregation of Revenue [Line Items]
Life of purchase power agreements	20 years

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Revenue from External Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 62,571	$ 60,086	$ 58,740	$ 54,587	$ 44,118	$ 39,036	$ 36,795	$ 60,462	$ 235,984	$ 180,411	$ 242,637
Lease
Disaggregation of Revenue [Line Items]
Total revenue									4,726	3,355	5,139
Gas
Disaggregation of Revenue [Line Items]
Total revenue									220,564	162,926	225,618
Other
Disaggregation of Revenue [Line Items]
Total revenue									$ 10,694	$ 14,130	$ 11,880

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($)	Sep. 23, 2021	Jun. 14, 2021	Oct. 30, 2019	Dec. 31, 2020	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Jan. 18, 2021
Related Party Transaction [Line Items]
Percentage of shares held by Manager related party					16.66%												16.66%			16.66%
Base management fees to be settled/settled in shares					$ 1,056,000	$ 7,698,000	$ 7,551,000	$ 5,552,000	$ 4,903,000	$ 4,980,000	$ 3,824,000	$ 7,356,000	$ 8,712,000	$ 7,987,000	$ 7,876,000	$ 7,528,000
Performance fees to be settled/settled in shares and cash					$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Percentage of cap on equity market capitalization on base management fee																				1.00%
Disposition agreement, qualifying termination event, minimum due upon sale or sales of businesses			$ 50,000,000
Disposition agreement, qualifying termination event, percentage applied above threshold			1.50%
Disposition agreement, qualifying termination event, threshold, net proceeds			$ 500,000,000
Disposition agreement, potential extension period for additional payment subject to qualifying termination event occurring on or prior to January 1, 2022			6 months
Disposition agreement, qualifying termination event, additional payment			$ 25,000,000
Disposition agreement, minimum management fee for years one and two			$ 20,000,000
Disposition agreement, minimum management fee for years one and two			2 years
Disposition agreement, minimum management fee for years three through six			$ 10,000,000
Recapture amount of previously waived management fees			$ 8,500,000
Disposition payment				$ 28,200,000													$ 228,570,000	$ 28,174,000	0
Discontinued Operations, Disposed of by Sale | Atlantic Aviation Business
Related Party Transaction [Line Items]
Disposition payment	$ 228,600,000
Disposal Group, Held-for-sale, Not Discontinued Operations | MIC Hawaii Holdings, LLC | Completion Date After July 1, 2022
Related Party Transaction [Line Items]
Disposition payment		$ 56,700,000
Disposal Group, Held-for-sale, Not Discontinued Operations | MIC Hawaii Holdings, LLC | Completion Date July 1, 2022 Or Earlier
Related Party Transaction [Line Items]
Disposition payment		81,700,000
Additional disposition payment		$ 25,000,000
Minimum
Related Party Transaction [Line Items]
Disposition agreement, percentage of net proceeds due upon sale or sales of businesses			2.90%
Maximum
Related Party Transaction [Line Items]
Disposition agreement, percentage of net proceeds due upon sale or sales of businesses			6.10%
Revolving Credit Facility
Related Party Transaction [Line Items]
Borrowing capacity																					$ 600,000,000
Macquarie Infrastructure Management (USA) Inc.
Related Party Transaction [Line Items]
Shares of the company held by manager, a related party (in shares)				13,954,821	14,719,423				13,954,821								14,719,423	13,954,821		14,719,423
Base management fees to be settled/settled in shares																	$ 21,900,000	$ 21,100,000	32,100,000
Notice period (not less than)																				1 year
Reimbursement of out-of-pocket expenses																	5,000	314,000	810,000
Legal fees																	38,000
Legal fee credit																		30,000
Accrued legal fees				$ 294,000	$ 60,000				$ 294,000								60,000	294,000		$ 60,000
Macquarie Capital Funding Llc | Revolving Credit Facility
Related Party Transaction [Line Items]
Borrowing capacity																					$ 40,000,000
Interest costs incurred																	$ 8,000	648,000	155,000
Former Board Of Director | Advisory Services
Related Party Transaction [Line Items]
Reimbursement of out-of-pocket expenses																		$ 25,000	$ 125,000

Related Party Transactions - Sc

Related Party Transactions - Schedule of Dividends Paid to Manager (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 07, 2021	Sep. 23, 2021	Jan. 08, 2021	Dec. 23, 2020	Mar. 11, 2020	Feb. 14, 2020	Nov. 14, 2019	Oct. 29, 2019	Aug. 15, 2019	Jul. 30, 2019	May 16, 2019	Apr. 29, 2019	Mar. 07, 2019	Feb. 14, 2019
Related Party Transactions [Abstract]
Cash dividend declared per share (in dollars per share)		$ 37.386817		$ 11		$ 1		$ 1		$ 1		$ 1		$ 1
Cash Paid to Manager	$ 544,841		$ 153,503		$ 13,396		$ 13,116		$ 12,914		$ 12,722		$ 12,598

Related Party Transactions - _2

Related Party Transactions - Schedule of Base Management Fees and Performance Fees (Details) - USD ($)	1 Months Ended	3 Months Ended												12 Months Ended
	Jan. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Base Management Fee Amount		$ 1,056,000	$ 7,698,000	$ 7,551,000	$ 5,552,000	$ 4,903,000	$ 4,980,000	$ 3,824,000	$ 7,356,000	$ 8,712,000	$ 7,987,000	$ 7,876,000	$ 7,528,000
Performance Fee Amount		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Units issued (in shares)		217,273	195,556	214,040	176,296	162,791	172,976	146,452	181,617	208,881	201,827	192,103	184,448
Subsequent Event
Related Party Transaction [Line Items]
Number of shares issued subsequent for base management fees to manager	72,323
Management
Related Party Transaction [Line Items]
Base Management Fee Amount														$ 21,900,000	$ 21,100,000	$ 32,100,000
Units issued (in shares)		217,273

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current taxes:
Federal	$ (5,578)	$ 804	$ 4,590
State	363	(3)	(1,061)
Total current tax (benefit) provision	(5,215)	801	3,529
Deferred taxes:
Federal	1,094	1,523	(10,281)
State	(3,706)	1,853	(4,888)
Total deferred tax (benefit) provision	(2,612)	3,376	(15,169)
Total tax (benefit) provision	$ (7,827)	$ 4,177	$ (11,640)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 0
Deferred income taxes	38,540,000	$ 26,453,000
Income tax (benefit) provision	(7,827,000)	4,177,000	$ (11,640,000)
Accumulated benefit obligation, fair value of plan assets	54,992,000	55,976,000	$ 155,739,000
Uncertain tax positions	$ 0	$ 0

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 0	$ 11,201
Deferred revenue	32	34
Accrued compensation	2,257	1,918
Accrued expense	338	316
Intangible assets	3,654	3,432
Other	2,919	3,796
Net deferred tax assets	9,200	20,697
Deferred tax liabilities:
Investment basis difference	(414)	(414)
Property and equipment	(46,536)	(45,995)
Unrealized gain on derivative instruments, net	(358)	(244)
Prepaid expenses and other	(432)	(497)
Total deferred tax liabilities	(47,740)	(47,150)
Net deferred tax liabilities	$ (38,540)	$ (26,453)

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Uncertainties [Abstract]
Tax benefit at U.S. statutory rate	$ (64,705)	$ (19,418)	$ (7,747)
Permanent differences and other	10,980	21,565	853
State income taxes, net of federal benefit	(2,641)	1,463	(4,705)
Income attributable to noncontrolling interest	95	95	(41)
Partnership expenses, not subject to tax	48,444	0	0
Change in investment and foreign tax credits	0	472	0
Total tax (benefit) provision	$ (7,827)	$ 4,177	$ (11,640)

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Accumulated benefit obligation, fair value of plan assets	$ 54,992,000	$ 55,976,000	$ 155,739,000
Discontinued Operations
Defined Contribution Plan Disclosure [Line Items]
Employer contributions - defined contribution plan	1,700,000	4,700,000	4,500,000
Employer contributions - defined contribution plan	1,700,000	4,700,000	4,500,000
Other Plan Benefits
Defined Contribution Plan Disclosure [Line Items]
Accumulated benefit obligation, fair value of plan assets	0	0	9,698,000
Other Plan Benefits | Postretirement Plans
Defined Contribution Plan Disclosure [Line Items]
Accumulated benefit obligation	2,800,000	3,200,000
Accumulated benefit obligation, fair value of plan assets	$ 0	0
IMTT | Pension Plan
Defined Contribution Plan Disclosure [Line Items]
Employee highest average compensation period	5 years
IMTT | PMLI Benefits
Defined Contribution Plan Disclosure [Line Items]
Final year compensation	25.00%
Maximum compensation amount in final year	$ 25,000
Early retirement age	62 years
Maximum age for which business pays medical premium of the retirees and spouses	65 years
Hawaii
Defined Contribution Plan Disclosure [Line Items]
Employer contributions - defined contribution plan	$ 927,000	907,000	910,000
Employer contributions - defined contribution plan	927,000	907,000	910,000
Hawaii | Pension Plan
Defined Contribution Plan Disclosure [Line Items]
Employer contributions - defined contribution plan	$ 0	0
Period to increase plan participant benefits	3 years
Projected benefit obligation	$ 56,600,000	58,700,000
Accumulated benefit obligation	56,600,000	58,700,000
Projected benefit obligation, fair value of plan assets	55,000,000	56,000,000
Accumulated benefit obligation, fair value of plan assets	54,992,000	55,976,000	$ 52,059,000
Employer contributions - defined contribution plan	$ 0	$ 0
Hawaii | PMLI Benefits
Defined Contribution Plan Disclosure [Line Items]
Maximum age for which business pays medical premium of the retirees and spouses	64 years
Minimum required retirement age - defined benefit plan	62 years
Minimum service period to eligible for participate	15 years
Maximum monthly premium after attaining age of 65 years	$ 150
Life insurance benefits for retirees - defined benefit plan	$ 1,000
Minimum | Discontinued Operations
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	0.00%
Minimum | Hawaii
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	0.00%
Maximum | Discontinued Operations
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	7.00%
Maximum | Hawaii
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	6.00%

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations and Changes in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Benefit obligation – beginning of year	$ 61,889	$ 252,468
Service cost	818	6,541	$ 6,194
Interest cost	1,486	7,808	9,177
Participant contributions	151	238
Actuarial (gains) losses	(1,642)	28,334
Benefits paid	(3,143)	(14,782)
Disposition of benefit obligation due to sale of business	(235)	(218,718)
Benefit obligation – end of year	59,324	61,889	252,468
Change in plan assets:
Fair value of plan assets - beginning of year	55,976	155,739
Actual return on plan assets	1,846	13,108
Employer contributions	162	562
Participant contributions	151	238
Benefits paid	(3,143)	(14,782)
Disposition of plan asset due to sale of business	0	(98,889)
Fair value of plan assets – end of year	54,992	55,976	155,739
Other Plan Benefits
Change in benefit obligation:
Benefit obligation – beginning of year	3,149	30,071
Service cost	28	1,052	1,063
Interest cost	65	944	1,145
Participant contributions	151	238
Actuarial (gains) losses	(79)	2,127
Benefits paid	(313)	(1,154)
Benefit obligation – end of year	2,766	3,149	30,071
Change in plan assets:
Fair value of plan assets - beginning of year	0	9,698
Actual return on plan assets	0	729
Employer contributions	162	562
Participant contributions	151	238
Benefits paid	(313)	(1,154)
Disposition of plan asset due to sale of business	0
Fair value of plan assets – end of year	0	0	9,698
Atlantic Aviation
Change in benefit obligation:
Disposition of benefit obligation due to sale of business	(235)
IMTT
Change in benefit obligation:
Disposition of benefit obligation due to sale of business		(30,129)
Change in plan assets:
Disposition of plan asset due to sale of business		(10,073)
Hawaii | Pension Plan
Change in benefit obligation:
Benefit obligation – beginning of year	58,740	54,211
Service cost	790	711	619
Interest cost	1,421	1,692	2,032
Participant contributions	0	0
Actuarial (gains) losses	(1,563)	4,845
Benefits paid	(2,830)	(2,719)
Disposition of benefit obligation due to sale of business	0	0
Benefit obligation – end of year	56,558	58,740	54,211
Change in plan assets:
Fair value of plan assets - beginning of year	55,976	52,059
Actual return on plan assets	1,846	6,636
Employer contributions	0	0
Participant contributions	0	0
Benefits paid	(2,830)	(2,719)
Disposition of plan asset due to sale of business	0	0
Fair value of plan assets – end of year	54,992	55,976	52,059
IMTT | Pension Plan
Change in benefit obligation:
Benefit obligation – beginning of year	0	168,186
Service cost	0	4,778	4,512
Interest cost	0	5,172	6,000
Participant contributions	0	0
Actuarial (gains) losses	0	21,362
Benefits paid	0	(10,909)
Disposition of benefit obligation due to sale of business	0	(188,589)
Benefit obligation – end of year	0	0	168,186
Change in plan assets:
Fair value of plan assets - beginning of year	0	93,982
Actual return on plan assets	0	5,743
Employer contributions	0	0
Participant contributions	0	0
Benefits paid	0	(10,909)
Disposition of plan asset due to sale of business	0	(88,816)
Fair value of plan assets – end of year	$ 0	$ 0	$ 93,982

Employee Benefit Plans - Funded

Employee Benefit Plans - Funded Status (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Funded status
Funded status at end of year	$ (4,332)	$ (5,913)
Net amount recognized in balance sheet	(4,332)	(5,913)
Amounts recognized in balance sheet consisting of:
Current liabilities	(243)	(248)
Noncurrent liabilities	(4,089)	(5,665)
Net amount recognized in balance sheet	(4,332)	(5,913)
Other Plan Benefits
Funded status
Funded status at end of year	(2,766)	(3,149)
Net amount recognized in balance sheet	(2,766)	(3,149)
Amounts recognized in balance sheet consisting of:
Current liabilities	(243)	(248)
Noncurrent liabilities	(2,523)	(2,901)
Net amount recognized in balance sheet	(2,766)	(3,149)
Hawaii | Pension Plan
Funded status
Funded status at end of year	(1,566)	(2,764)
Net amount recognized in balance sheet	(1,566)	(2,764)
Amounts recognized in balance sheet consisting of:
Current liabilities	0	0
Noncurrent liabilities	(1,566)	(2,764)
Net amount recognized in balance sheet	(1,566)	(2,764)
IMTT | Pension Plan
Funded status
Funded status at end of year	0	0
Net amount recognized in balance sheet	0	0
Amounts recognized in balance sheet consisting of:
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount recognized in balance sheet	$ 0	$ 0

Employee Benefit Plans - Amount

Employee Benefit Plans - Amounts not yet reflected in Net Periodic Benefit Cost and Included in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Prior service cost	$ 18	$ (157)
Accumulated loss	(6,918)	(54,872)
Accumulated other comprehensive loss	(6,900)	(55,029)
Net periodic benefit cost in excess (deficit) of cumulative employer contributions	2,333	(70,713)
Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business	240	73,150
Reclassification to net income (loss) due to sale of business	(5)	46,679
Net amount recognized in balance sheet	(4,332)	(5,913)
Other Plan Benefits
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Prior service cost	18	(157)
Accumulated loss	(436)	(6,540)
Accumulated other comprehensive loss	(418)	(6,697)
Net periodic benefit cost in excess (deficit) of cumulative employer contributions	(2,583)	(16,508)
Net amount recognized in balance sheet	(2,766)	(3,149)
Atlantic Aviation
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business	240
Reclassification to net income (loss) due to sale of business	(5)
IMTT
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business		13,873
Reclassification to net income (loss) due to sale of business		6,183
Hawaii | Pension Plan
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Prior service cost	0	0
Accumulated loss	(6,482)	(7,836)
Accumulated other comprehensive loss	(6,482)	(7,836)
Net periodic benefit cost in excess (deficit) of cumulative employer contributions	4,916	5,072
Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business	0	0
Reclassification to net income (loss) due to sale of business	0	0
Net amount recognized in balance sheet	(1,566)	(2,764)
IMTT | Pension Plan
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
Prior service cost	0	0
Accumulated loss	0	(40,496)
Accumulated other comprehensive loss	0	(40,496)
Net periodic benefit cost in excess (deficit) of cumulative employer contributions	0	(59,277)
Disposition of net periodic benefit cost in deficit of cumulative employer contributions due to sale of business	0	59,277
Reclassification to net income (loss) due to sale of business	0	40,496
Net amount recognized in balance sheet	$ 0	$ 0

Employee Benefit Plans - Amorti

Employee Benefit Plans - Amortized from Accumulated Other Comprehensive Income (Loss) over the Next Year (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ (16)	$ (15)
Amortization of net loss	141	304
Pension Plan | Hawaii
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	0
Amortization of net loss	126	282
Other Plan Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	(16)	(15)
Amortization of net loss	$ 15	$ 22

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Net Periodic Benefit Cost and Other Changes in Other Comprehensive Loss (Income) for Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of net periodic benefit cost:
Service cost	$ 818	$ 6,541	$ 6,194
Interest cost	1,486	7,808	9,177
Expected return on plan assets	(2,426)	(7,543)	(7,254)
Recognized actuarial loss	404	942	804
Amortization of prior service (cost) credit	(16)	2	2
Net periodic benefit cost	266	7,750	8,923
Other changes recognized in other comprehensive (income) loss:
Net (gain) loss arising during the year	(1,062)	22,769	12,716
Amortization of prior service cost (credit)	16	(2)	(2)
Amortization of loss	(404)	(942)	(804)
Total recognized in other comprehensive (income) loss	(1,450)	21,825	11,910
Other Plan Benefits
Components of net periodic benefit cost:
Service cost	28	1,052	1,063
Interest cost	65	944	1,145
Expected return on plan assets	0	(508)	(460)
Recognized actuarial loss	33	193	99
Amortization of prior service (cost) credit	(16)	2	2
Net periodic benefit cost	110	1,683	1,849
Other changes recognized in other comprehensive (income) loss:
Net (gain) loss arising during the year	(79)	1,907	736
Amortization of prior service cost (credit)	16	(2)	(2)
Amortization of loss	(33)	(193)	(99)
Total recognized in other comprehensive (income) loss	$ (96)	$ 1,712	$ 635
Weighted average assumptions to determine benefit obligations:
Rate of compensation increase		4.57%	4.57%
Weighted average assumptions to determine net cost:
Expected long-term rate of return on plan assets during fiscal year		5.50%	5.50%
Rate of compensation increase		4.57%	4.57%
Assumed healthcare cost trend rates:
Initial health care cost trend rate	7.00%	7.25%
Ultimate rate	4.50%
Other Plan Benefits | Minimum
Weighted average assumptions to determine benefit obligations:
Discount rate	1.73%	1.73%	2.82%
Weighted average assumptions to determine net cost:
Discount rate	1.73%	2.82%	3.91%
Assumed healthcare cost trend rates:
Initial health care cost trend rate			7.25%
Ultimate rate		4.50%	4.50%
Other Plan Benefits | Maximum
Weighted average assumptions to determine benefit obligations:
Discount rate	2.55%	2.75%	3.35%
Weighted average assumptions to determine net cost:
Discount rate	2.15%	3.35%	4.35%
Assumed healthcare cost trend rates:
Initial health care cost trend rate			7.75%
Ultimate rate			5.00%
Hawaii | Pension Plan
Components of net periodic benefit cost:
Service cost	$ 790	$ 711	$ 619
Interest cost	1,421	1,692	2,032
Expected return on plan assets	(2,426)	(2,280)	(2,189)
Recognized actuarial loss	371	306	705
Amortization of prior service (cost) credit	0	0	0
Net periodic benefit cost	156	429	1,167
Other changes recognized in other comprehensive (income) loss:
Net (gain) loss arising during the year	(983)	488	(1,439)
Amortization of prior service cost (credit)	0	0	0
Amortization of loss	(371)	(306)	(705)
Total recognized in other comprehensive (income) loss	$ (1,354)	$ 182	$ (2,144)
Weighted average assumptions to determine benefit obligations:
Discount rate	2.80%	2.45%	3.20%
Weighted average assumptions to determine net cost:
Discount rate	2.45%	3.20%	4.25%
Expected long-term rate of return on plan assets during fiscal year	4.45%	4.50%	4.90%
IMTT | Pension Plan
Components of net periodic benefit cost:
Service cost	$ 0	$ 4,778	$ 4,512
Interest cost	0	5,172	6,000
Expected return on plan assets	0	(4,755)	(4,605)
Recognized actuarial loss	0	443	0
Amortization of prior service (cost) credit	0	0	0
Net periodic benefit cost	0	5,638	5,907
Other changes recognized in other comprehensive (income) loss:
Net (gain) loss arising during the year	0	20,374	13,419
Amortization of prior service cost (credit)	0	0	0
Amortization of loss	0	(443)	0
Total recognized in other comprehensive (income) loss	$ 0	$ 19,931	$ 13,419
Weighted average assumptions to determine benefit obligations:
Discount rate		2.60%	3.25%
Rate of compensation increase		4.57%	4.57%
Weighted average assumptions to determine net cost:
Discount rate		3.25%	4.35%
Expected long-term rate of return on plan assets during fiscal year		5.50%	5.50%
Rate of compensation increase		4.57%	4.57%

Employee Benefit Plans - Asset

Employee Benefit Plans - Asset Allocation (Details) - Hawaii - Pension Plan	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	37.00%	25.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	57.00%	70.00%
Global real estate fund
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	5.00%	4.00%
Cash
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	1.00%	1.00%

Employee Benefit Plans - Asse_2

Employee Benefit Plans - Asset Allocations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	$ 54,992	$ 55,976	$ 155,739
Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	725	489
Significant Observable Inputs (Level 2)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	54,267	55,487
Significant Unobservable Inputs (Level 3)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Cash and money market
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	725	489
Cash and money market | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	725	489
Cash and money market | Significant Observable Inputs (Level 2)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Cash and money market | Significant Unobservable Inputs (Level 3)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Equity securities
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	20,114	14,276
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Equity securities | Significant Observable Inputs (Level 2)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	20,114	14,276
Equity securities | Significant Unobservable Inputs (Level 3)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Fixed income securities
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	31,219	39,115
Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Fixed income securities | Significant Observable Inputs (Level 2)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	31,219	39,115
Fixed income securities | Significant Unobservable Inputs (Level 3)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Global real estate fund
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	2,934	2,096
Global real estate fund | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	0	0
Global real estate fund | Significant Observable Inputs (Level 2)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	2,934	2,096
Global real estate fund | Significant Unobservable Inputs (Level 3)
Schedule Of Pension And Other Postretirement Benefits Expected Benefit Payments [Line Items]
Fair value of plan assets	$ 0	$ 0

Employee Benefit Plans - Estima

Employee Benefit Plans - Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2021USD ($)
Payment for Pension and Other Postretirement Benefits [Abstract]
2022	$ 3,299
2023	3,328
2024	3,330
2025	3,370
2026	3,390
Thereafter	17,033
Total	$ 33,750

Quarterly Data (Unaudited) (Det

Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Product revenue	$ 62,571	$ 60,086	$ 58,740	$ 54,587	$ 44,118	$ 39,036	$ 36,795	$ 60,462	$ 235,984	$ 180,411	$ 242,637
Operating loss from continuing operations	(4,959)	(282,344)	(5,628)	(1,070)	(52,832)	(5,960)	266	(11,175)	(294,001)	(69,701)	(8,976)
Net loss from continuing operations attributable to MIH	(3,857)	(274,637)	(15,124)	(6,867)	(71,131)	(5,368)	(2,280)	(18,003)	(300,485)	(96,782)	(25,006)
Basic and diluted net income (loss) from discontinued operations attributable to MIH	$ (12,631)	$ 2,954,444	$ 22,473	$ 20,067	$ 33,170	$ (887,880)	$ (5,674)	$ 29,305	$ 2,984,353	$ (831,079)	$ 181,514
Per unit information attributable to MIH(1):
Basic loss per unit from continuing operations attributable to MIH (in dollars per share)	$ (0.05)	$ (3.12)	$ (0.18)	$ (0.08)	$ (0.82)	$ (0.06)	$ (0.02)	$ (0.21)	$ (3.42)	$ (1.11)	$ (0.29)
Basic income (loss) per unit from discontinued operations attributable to MIH (in dollars per share)	(0.14)	33.61	0.26	0.23	0.38	(10.20)	(0.07)	0.34	33.99	(9.56)	2.11
Basic income (loss) per unit attributable to MIH (in dollars per share)	(0.19)	30.49	0.08	0.15	(0.44)	(10.26)	(0.09)	0.13	30.57	(10.67)	1.82
Diluted loss per unit from continuing operations attributable to MIH (in dollars per share)	(0.05)	(3.12)	(0.18)	(0.08)	(0.82)	(0.06)	(0.02)	(0.21)	(3.42)	(1.11)	(0.29)
Diluted income (loss) income per unit from discontinued operations attributable to MIH (in dollars per share)	(0.14)	33.61	0.26	0.23	0.38	(10.20)	(0.07)	0.34	33.99	(9.56)	2.11
Diluted income (loss) income per unit attributable to MIH (in dollars per share)	(0.19)	30.49	0.08	0.15	(0.44)	(10.26)	(0.09)	0.13	30.57	(10.67)	1.82
Cash distributions declared per unit (in dollars per share)	$ 0	$ 37.386817	$ 0	$ 0	$ 11	$ 0	$ 0	$ 0	$ 37.386817	$ 11	$ 4