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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 6,073,143 | $ 5,713,912 |
Accumulated depreciation and amortization | (1,789,431) | (1,706,327) |
Net property, plant and equipment | 4,283,712 | 4,007,585 |
Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 6,073,143 | 5,713,912 |
Accumulated depreciation and amortization | (1,789,431) | (1,706,327) |
Net property, plant and equipment | $ 4,283,712 | $ 4,007,585 |
Average depreciation rates, minimum | 2.00% | 2.00% | 2.00%
Average depreciation rates, maximum | 3.00% | 3.00% | 3.00%
Interest costs capitalized | $ 3,400 | $ 3,000 | $ 3,600
Construction work in process expenditures incurred but not yet paid | 15,600 | 21,700 | $ 11,900
Natural gas distribution pipelines and related equipment | Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 4,861,340 | 4,572,343 |
Natural gas transmission pipelines and related equipment | Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 517,697 | 497,791 |
General plant and other | Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 567,580 | 513,445 |
Construction work in process | Regulated [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 126,526 | $ 130,333 |

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- Definition The maximum average depreciation percentage rate of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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- Definition The minimum average depreciation percentage rate of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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- Definition Future cash outflow to pay for construction in progress expenditures that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. + References No definition available. + Details
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