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SEGMENT REPORTING (Geographical Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 858,204 | $ 843,181 | $ 849,140 | $ 749,778 | $ 747,403 | $ 755,846 | $ 752,788 | $ 688,941 | $ 3,300,303 | $ 2,944,978 | $ 2,755,226
Percent of revenues |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Property, plant and equipment, net | $ 1,561,978 |  |  |  | $ 1,587,365 |  |  |  | $ 1,561,978 | $ 1,587,365 |
Percent of property, plant and equipment, net | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |
Permits and other intangibles, net | $ 441,875 |  |  |  | $ 469,128 |  |  |  | $ 441,875 | $ 469,128 |
Percent of permits and other intangibles, net | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |
Assets | $ 3,738,321 |  |  |  | $ 3,706,570 |  |  |  | $ 3,738,321 | $ 3,706,570 |
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,796,145 |  |
Property, plant and equipment, net | $ 1,233,949 |  |  |  | $ 1,175,437 |  |  |  | $ 1,233,949 | $ 1,175,437 |
Percent of property, plant and equipment, net | 79.00% |  |  |  | 74.00% |  |  |  | 79.00% | 74.00% |
Permits and other intangibles, net | $ 393,045 |  |  |  | $ 408,654 |  |  |  | $ 393,045 | $ 408,654 |
Percent of permits and other intangibles, net | 88.90% |  |  |  | 87.10% |  |  |  | 88.90% | 87.10% |
Assets | $ 3,090,311 |  |  |  | $ 2,985,394 |  |  |  | $ 3,090,311 | $ 2,985,394 |
Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 504,158 |  |
Property, plant and equipment, net | $ 328,029 |  |  |  | $ 411,928 |  |  |  | $ 328,029 | $ 411,928 |
Percent of property, plant and equipment, net | 21.00% |  |  |  | 26.00% |  |  |  | 21.00% | 26.00% |
Permits and other intangibles, net | $ 48,830 |  |  |  | $ 60,474 |  |  |  | $ 48,830 | $ 60,474 |
Percent of permits and other intangibles, net | 11.10% |  |  |  | 12.90% |  |  |  | 11.10% | 12.90% |
Assets | $ 648,010 |  |  |  | $ 721,176 |  |  |  | $ 648,010 | $ 721,176 |
Direct revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,300,303 | 2,944,978 | $ 2,755,226
Direct revenues | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 2,721,814 | $ 2,392,000 | $ 2,213,355
Percent of revenues |  |  |  |  |  |  |  |  | 82.50% | 81.20% | 80.30%
Direct revenues | Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 578,489 | $ 552,978 | $ 541,871
Percent of revenues |  |  |  |  |  |  |  |  | 17.50% | 18.80% | 19.70%

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