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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment by Property Type | The following table sets forth our property, plant and equipment by property type, for the periods indicated:
|  | Estimated Useful Lives (Years) |  | December 31, 2018 |  | December 31, 2017
|  |  |  | (Thousands of dollars)
Nonregulated |  |  |  |  |  |
Gathering pipelines and related equipment |  | 5 to 40 |  | $ | 3,851,043 |  |  | $ | 3,613,344 |
Processing and fractionation and related equipment |  | 3 to 40 |  | 4,171,072 |  |  | 3,873,709 |
Storage and related equipment |  | 3 to 54 |  | 656,455 |  |  | 604,656 |
Transmission pipelines and related equipment |  | 5 to 54 |  | 782,258 |  |  | 700,455 |
General plant and other |  | 2 to 60 |  | 547,424 |  |  | 504,610 |
Construction work in process |  | — |  | 797,182 |  |  | 362,253 |
Regulated |  |  |  |  |  |  |  |
Storage and related equipment |  | 5 to 25 |  | 8,987 |  |  | 12,486 |
Natural gas transmission pipelines and related equipment |  | 5 to 77 |  | 1,475,789 |  |  | 1,406,780 |
Natural gas liquids transmission pipelines and related equipment |  | 5 to 88 |  | 4,677,599 |  |  | 4,340,428 |
General plant and other |  | 2 to 50 |  | 61,136 |  |  | 57,902 |
Construction work in process |  | — |  | 1,002,018 |  |  | 83,044 |
Property, plant and equipment |  |  |  | 18,030,963 |  |  | 15,559,667 |
Accumulated depreciation and amortization - nonregulated |  |  |  | (2,168,855 | ) |  | (1,888,010 | )
Accumulated depreciation and amortization - regulated |  |  |  | (1,095,457 | ) |  | (973,531 | )
Net property, plant and equipment |  |  |  | $ | 14,766,651 |  |  | $ | 12,698,126 |
Average Depreciation Rates for Regulated Property | The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Natural Gas Liquids |  | 1.9% |  | 1.9% |  | 1.9%
Natural Gas Pipelines |  | 2.1% |  | 2.1% |  | 2.1%

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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