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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 100 |  | $ 300 |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Benefit Plan, Service Cost | 1,296 | $ 1,118 | 3,955 | $ 3,234 |
Postemployment Benefits, Period Expense |  |  | 33,500 | $ 20,300 |
Deferred Compensation Liability, Classified, Noncurrent | $ 23,800 |  | $ 23,800 |  | $ 24,300
CANADA | Minimum [Member] |  |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 3.00% |  |
CANADA | Maximum [Member] |  |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 5.00% |  |
UNITED STATES |  |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  | 50.00% |  |
Defined Contribution Plan Employer Matching Contribution Percent |  |  | 6.00% |  |

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