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Revenue Recognition
 6 Months Ended
Jun. 30, 2021
Revenue Recognition [Abstract]  
Revenue Recognition Revenue Recognition
Revenue from Contracts with Customers
The following tables reflect the disaggregation of our revenues by major category for the three months ended June 30, 2021 and 2020, respectively:
Three Months Ended
June 30, 2021
Offshore Pipeline TransportationSodium Minerals & Sulfur ServicesMarine TransportationOnshore Facilities and TransportationConsolidated
Fee-based revenues$73,221 $— $47,626 $18,176 $139,023 
Product Sales— 212,434 — 127,745 340,179 
Refinery Services— 24,653 — — 24,653 
$73,221 $237,087 $47,626 $145,921 $503,855 
Three Months Ended
June 30, 2020
Offshore Pipeline TransportationSodium Minerals & Sulfur ServicesMarine TransportationOnshore Facilities and TransportationConsolidated
Fee-based revenues$64,964 $— $56,720 $21,845 $143,529 
Product Sales— 172,410 — 52,314 224,724 
Refinery Services— 20,214 — — 20,214 
$64,964 $192,624 $56,720 $74,159 $388,467 
The following tables reflect the disaggregation of our revenues by major category for the six months ended June 30, 2021 and 2020, respectively:
Six Months Ended
June 30, 2021
Offshore Pipeline TransportationSodium Minerals & Sulfur ServicesMarine TransportationOnshore Facilities and TransportationConsolidated
Fee-based revenues$137,605 $— $87,957 $42,570 $268,132 
Product Sales— 417,212 — 292,568 709,780 
Refinery Services— 47,162 — — 47,162 
$137,605 $464,374 $87,957 $335,138 $1,025,074 
Six Months Ended
June 30, 2020
Offshore Pipeline TransportationSodium Minerals & Sulfur ServicesMarine TransportationOnshore Facilities & TransportationConsolidated
Fee-based revenues$143,393 $— $119,066 $62,835 $325,294 
Product Sales— 387,776 — 167,082 554,858 
Refinery Services— 48,238 — — 48,238 
$143,393 $436,014 $119,066 $229,917 $928,390 

    The Company recognizes revenue upon the satisfaction of its performance obligations under its contracts. The timing of revenue recognition varies for our different revenue streams. In general, the timing includes recognition of revenue over time as services are being performed as well as recognition of revenue at a point in time, for delivery of products.

Contract Assets and Liabilities
    The table below depicts our contract asset and liability balances at December 31, 2020 and June 30, 2021:
Contract AssetsContract Liabilities
Current Assets- OtherOther AssetsAccrued LiabilitiesOther Long-Term Liabilities
Balance at December 31, 2020$36,500 $12,065 $2,988 $19,834 
Balance at June 30, 202130,813 — 2,669 18,576 


Transaction Price Allocations to Remaining Performance Obligations
    We are required to disclose the amount of our transaction prices that are allocated to unsatisfied performance obligations as of June 30, 2021. We are exempted from disclosing performance obligations with a duration of one year or less, revenue recognized related to performance obligations where the consideration corresponds directly with the value provided to customers, and contracts with variable consideration that is allocated wholly to an unsatisfied performance obligation or promise to transfer a good or service that is part of a series in accordance with ASC 606.

    The majority of our contracts qualify for one of these expedients or exemptions. For the remaining contract types that involve revenue recognition over a long-term period with long-term fixed consideration (adjusted for indexing as required), we determined our allocations of transaction price that relate to unsatisfied performance obligations. For our tiered pricing offshore transportation contracts, we provide firm capacity for both fixed and variable consideration over a long term period. Therefore, we have allocated the remaining contract value to future periods.
    
    The following chart depicts how we expect to recognize revenues for future periods related to these contracts:
Offshore Pipeline TransportationOnshore Facilities and Transportation
Remainder of 2021$31,048 $9,604 
202275,623 4,698 
202363,982 — 
202456,326 — 
202560,311 — 
Thereafter97,761 — 
Total$385,051 $14,302