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Operating Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Operating Leases [Abstract]  
Lessee, Operating Lease, Liability, Maturity
For operating leases as of December 31, 2020, the future minimum payments in the years ended December 31, were as follows (in thousands):
2021$42,215 
202228,986 
202316,687 
202414,400 
202513,412 
Years subsequent to 202515,083 
130,783 
Interest component(13,765)
117,018 
Current portion of long-term operating lease liabilities(37,599)
Long-term operating lease liabilities$79,419 
Lease, Cost
The components of lease expense for the year ended December 31, were as follows (in thousands):
20202019
Operating lease expense$44,732 $42,863 
Short-term lease expense (lease duration of twelve months or less at lease commencement)24,585 22,992 
Sublease income(35,038)(33,428)
$34,279 $32,427 
Operating Leases Other Information
Other information related to operating leases for the year ended December 31, was as follows (in thousands except weighted average data):
20202019
Operating cash outflows from operating leases$44,578 $43,096 
Right-of-use assets obtained in exchange for operating lease liabilities$11,142 $179,944 
Weighted average remaining lease term, in years4.75.2
Weighted average discount rate4.9 %4.9 %
Schedule of Future Minimum Lease Revenues for Operating Leases Future minimum lease revenues from these arrangements for the years ended December 31, were as follows (in thousands):
Total Minimum Lease Revenues
Leased-in Obligations(1)
Net Minimum Lease Income
2021$133,751 $(32,416)$101,335 
202291,172 (23,145)68,027 
202357,908 (11,502)46,406 
202431,923 (11,502)20,421 
202527,516 (11,561)15,955 
Years subsequent to 202528,263 (7,420)20,843 
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(1)The total payments to be made under existing non-cancelable leases for the property and equipment subject to these future minimum lease revenues.
Major Classes of Property and Equipment Earning Lease Revenues
The major classes of owned property and equipment earning lease revenues as of December 31, were as follows (in thousands):
Historical
Cost		Accumulated
Depreciation		Net Book
Value
2020
Ocean Services:
Petroleum and chemical carriers - U.S.-flag$544,549 $(280,432)$264,117 
Harbor tugs - U.S.-flag & foreign-flag45,379 (18,313)27,066 
Ocean liquid tank barges - U.S.-flag39,238 (17,694)21,544 
629,166 (316,439)312,727 
Inland Services:
Towboats50,615 (5,319)45,296 
$679,781 $(321,758)$358,023 
2019
Ocean Services:
Petroleum and chemical carriers - U.S.-flag$544,549 $(258,153)$286,396 
Harbor and offshore tugs - U.S.-flag & foreign-flag51,129 (17,363)33,766 
Ocean liquid tank barges - U.S.-flag39,238 (16,171)23,067 
634,916 (291,687)343,229 
Inland Services:
Towboats50,615 (3,498)47,117 
$685,531 $(295,185)$390,346