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Intangible Assets, Goodwill and Other Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Goodwill and Other Assets | Intangible Assets, Goodwill and Other Assets Intangible Assets The following table reflects the components of intangible assets being amortized at December 31, 2017 and 2016:
|  |  | December 31, 2017 |  | December 31, 2016
| Weighted Amortization Period in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Sodium Minerals and Sulfur Services: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5 |  | $ | 94,654 |  |  | $ | 92,493 |  |  | $ | 2,161 |  |  | $ | 94,654 |  |  | $ | 89,756 |  |  | $ | 4,898 |
Licensing agreements | 6 |  | 38,678 |  |  | 36,528 |  |  | 2,150 |  |  | 38,678 |  |  | 34,204 |  |  | 4,474 |
Non-compete agreement | 3 |  | 800 |  |  | 89 |  |  | 711 |  |  | — |  |  | — |  |  | — |
Segment total |  |  | 134,132 |  |  | 129,110 |  |  | 5,022 |  |  | 133,332 |  |  | 123,960 |  |  | 9,372 |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5 |  | 35,430 |  |  | 35,082 |  |  | 348 |  |  | 35,430 |  |  | 33,676 |  |  | 1,754 |
Intangibles associated with lease | 15 |  | 13,260 |  |  | 4,933 |  |  | 8,327 |  |  | 13,260 |  |  | 4,459 |  |  | 8,801 |
Segment total |  |  | 48,690 |  |  | 40,015 |  |  | 8,675 |  |  | 48,690 |  |  | 38,135 |  |  | 10,555 |
Marine contract intangible | 5 |  | 27,000 |  |  | 11,700 |  |  | 15,300 |  |  | 27,000 |  |  | 6,300 |  |  | 20,700 |
Offshore pipeline contract intangibles | 19 |  | 158,101 |  |  | 20,109 |  |  | 137,992 |  |  | 158,101 |  |  | 11,788 |  |  | 146,313 |
Other | 5 |  | 28,900 |  |  | 13,483 |  |  | 15,417 |  |  | 28,569 |  |  | 10,622 |  |  | 17,947 |
Total |  |  | $ | 396,823 |  |  | $ | 214,417 |  |  | $ | 182,406 |  |  | $ | 395,692 |  |  | $ | 190,805 |  |  | $ | 204,887 |
The licensing agreements referred to in the table above relate to the agreements we have with refiners to provide services. The onshore facilities and transportation lease relates to a terminal facility in Shreveport, Louisiana. The marine contract intangible relates to the contracts we assumed in the purchase of the M/T American Phoenix in November 2014. The offshore pipeline contract intangibles relate to customer contracts surrounding certain transportation agreements with producers in the Lucius production area in Southeast Keathley Canyon, which support our SEKCO pipeline identified in connection with our purchase price allocation surrounding the Enterprise Acquisition. We are recording amortization of our intangible assets based on the period over which the asset is expected to contribute to our future cash flows. Generally, the contribution to our cash flows of the customer and supplier relationships, licensing agreements and trade name intangible assets is expected to decline over time, such that greater value is attributable to the periods shortly after the acquisition was made. The onshore facilities and transportation lease, marine contract, offshore pipeline contract intangibles and other intangible assets are being amortized on a straight-line basis. Amortization expense on intangible assets was $23.6 million, $24.3 million and $20.0 million for the years ended December 31, 2017, 2016 and 2015, respectively. The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022
Sodium Minerals and Sulfur Services: |  |  |  |  |  |  |  |  |
Customer relationships | $ | 2,161 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Licensing agreements | 2,150 |  |  | — |  |  | — |  |  | — |  |  | — |
Non Compete | 267 |  |  | 267 |  |  | 177 |  |  | — |  |  | — |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |
Customer relationships | 41 |  |  | 39 |  |  | 38 |  |  | 37 |  |  | 35 |
Intangibles associated with lease | 474 |  |  | 474 |  |  | 474 |  |  | 474 |  |  | 474 |
Marine contract intangibles | 5,400 |  |  | 5,400 |  |  | 4,500 |  |  | — |  |  | — |
Offshore pipeline contract intangibles | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |
Other | 2,974 |  |  | 2,952 |  |  | 2,921 |  |  | 1,810 |  |  | 1,652 |
Total | $ | 21,788 |  |  | $ | 17,453 |  |  | $ | 16,431 |  |  | $ | 10,642 |  |  | $ | 10,482 |
Goodwill The carrying amount of goodwill by business segment at both December 31, 2017 and 2016 was $301.9 million in sodium minerals and sulfur services and $23.1 million in onshore facilities and transportation. We have no t recognized any impairment losses related to goodwill for any of the periods presented. Other Assets Other assets consisted of the following:
| December 31,
| 2017 |  | 2016
CO 2 volumetric production payments, net of amortization | $ | 2,175 |  |  | $ | 3,503 |
Deferred marine charges, net (1) | 30,246 |  |  | 27,710 |
Other deferred costs and deposits | 24,207 |  |  | 25,398 |
Other assets, net of amortization | $ | 56,628 |  |  | $ | 56,611 |
(1) | See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2)
The CO 2 assets are being amortized on a units-of-production method. We recorded amortization of $1.3 million in 2017, $3.9 million in 2016 and $5.9 million in 2015.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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