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Revenue
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue REVENUE

The following table disaggregates our revenue by major source:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Terminalling and storage segment
 
 
 
 
 
 
 
Lubricant product sales
$
32,553

 
$
38,015

 
$
94,991

 
$
111,272

Throughput and storage
21,193

 
24,332

 
65,674

 
72,447

 
$
53,746

 
$
62,347

 
$
160,665

 
$
183,719

Natural gas liquids segment
 
 
 
 
 
 
 
Natural gas liquids product sales
$
60,871

 
$
101,919

 
$
234,743

 
$
351,706

 
$
60,871

 
$
101,919

 
$
234,743

 
$
351,706

Sulfur services segment
 
 
 
 
 
 
 
Sulfur product sales
$
6,398

 
$
13,932

 
$
24,554

 
$
36,248

Fertilizer product sales
13,815

 
14,049

 
57,391

 
62,317

Sulfur services
2,859

 
2,787

 
8,576

 
8,361

 
$
23,072

 
$
30,768

 
$
90,521

 
$
106,926

Transportation segment
 
 
 
 
 
 
 
Land transportation
$
25,059

 
$
26,286

 
$
74,675

 
$
73,658

Inland transportation
13,588

 
11,338

 
40,253

 
32,236

Offshore transportation
1,564

 
1,389

 
4,399

 
4,684

 
$
40,211

 
$
39,013

 
$
119,327

 
$
110,578



Revenue is measured based on a consideration specified in a contract with a customer and excludes amounts collected on behalf of third parties where the Partnership is acting as an agent. The Partnership recognizes revenue when the Partnership satisfies a performance obligation, which typically occurs when the Partnership transfers control over a product to a customer or as the Partnership delivers a service.

The following is a description of the principal activities - separated by reportable segments - from which the Partnership generates revenue.

Terminalling and Storage Segment

Revenue is recognized for storage contracts based on the contracted monthly tank fixed fee.  For throughput contracts, revenue is recognized based on the volume moved through the Partnership’s terminals at the contracted rate.  For the Partnership’s tolling agreement, revenue is recognized based on the contracted monthly reservation fee and throughput volumes moved through the facility.  When lubricants and drilling fluids are sold by truck or rail, revenue is recognized when title is transfered, which is either upon delivering product to the customer or when the product leaves the Partnership's facility, depending on the specific terms of the contract. Delivery of product is invoiced as the transaction occurs and is generally paid within a month. Throughput and storage revenue in the table above includes non-cancelable revenue arrangements that are under the scope of ASC 842, whereby the Partnership has committed certain Terminalling and Storage assets in exchange for a minimum fee.

Natural Gas Liquids Segment

NGL distribution revenue is recognized when product is delivered by truck, rail, or pipeline to the Partnership's NGL customers. Revenue is recognized on title transfer of the product to the customer. Delivery of product is invoiced as the transaction occurs and is generally paid within a month.

Sulfur Services Segment

Revenue from sulfur and fertilizer product sales is recognized when the customer takes title to the product.  Delivery of product is invoiced as the transaction occurs and is generally paid within a month. Revenue from sulfur services is recognized as services are performed during each monthly period. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

Transportation Segment

Revenue related to land transportation is recognized for line hauls based on a mileage rate. For contracted trips, revenue is recognized upon completion of the particular trip. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

Revenue related to marine transportation is recognized for time charters based on a per day rate. For contracted trips, revenue is recognized upon completion of the particular trip. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

The table includes estimated minimum revenue expected to be recognized in the future related to performance obligations that are unsatisfied at the end of the reporting period. The Partnership applies the practical expedient in ASC 606-10-50-14(a) and does not disclose information about remaining performance obligations that have original expected durations of one year or less.
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
 
Total
Terminalling and storage
 
 
 
 
 
 
 
 
 
 
 
 
 
Throughput and storage
$
12,615

 
$
49,405

 
$
46,694

 
$
42,735

 
$
42,854

 
$
392,624

 
$
586,927

Sulfur services
 
 
 
 
 
 
 
 
 
 
 
 
 
Sulfur product sales
4,271

 
4,898

 
1,181

 
295

 
—

 
—

 
10,645

Transportation
 
 
 
 
 
 
 
 
 
 
 
 
 
Offshore transportation
1,564

 
—

 
—

 
—

 
—

 
—

 
1,564

Total
$
18,450

 
$
54,303

 
$
47,875

 
$
43,030

 
$
42,854

 
$
392,624

 
$
599,136