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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 100 |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Service Cost | 1,347 | $ 1,068 |
Postemployment Benefits, Period Expense | 10,700 | $ 5,500 |
Deferred Compensation Liability, Classified, Noncurrent | $ 24,000 |  | $ 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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