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SEGMENT REPORTING (Geographical Information) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,525,298 | $ 1,588,151
Percent of property, plant and equipment, net | 100.00% | 100.00%
Permits and other intangibles, net | $ 386,620 | $ 419,066
Percent of permits and other intangibles, net | 100.00% | 100.00%
Assets | $ 4,131,520 | $ 4,108,904
United States |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 1,246,758 | $ 1,273,205
Percent of property, plant and equipment, net | 81.70% | 80.20%
Permits and other intangibles, net | $ 342,787 | $ 372,609
Percent of permits and other intangibles, net | 88.70% | 88.90%
Assets | $ 3,447,811 | $ 3,413,254
Canada |  |
Segment Reporting Information [Line Items] |  |
Property, plant and equipment, net | $ 278,540 | $ 314,946
Percent of property, plant and equipment, net | 18.30% | 19.80%
Permits and other intangibles, net | $ 43,833 | $ 46,457
Percent of permits and other intangibles, net | 11.30% | 11.10%
Assets | $ 683,709 | $ 695,650

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