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SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total assets | $ 3,774,329 | $ 3,706,570
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total assets | 3,090,011 | 2,985,394
Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total assets | 684,144 | 721,176
Other foreign |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total assets | $ 174 | $ 0

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