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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 1,309   $ 1,149  
Interest cost 1,037   1,089  
Expected return on plan assets (1,614)   (1,422)  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 27   (16)  
Net periodic benefit cost 759   800  
Defined Benefit Plan, Service Cost 1,309   1,149  
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 1,000    
Deferred Compensation Liability, Classified, Noncurrent 21,900     $ 25,200
Postemployment Benefits, Period Expense 2,800   12,600  
Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Other Nonoperating Gains (Losses) $ (600)   $ (300)  
Canadian 401K Defined Contribution Plan [Member] | Minimum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Defined Contribution Plan Employer Matching Contribution Percent 3.00%      
Canadian 401K Defined Contribution Plan [Member] | Maximum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Defined Contribution Plan Employer Matching Contribution Percent 5.00%      
US 401K Defined Contribution Plan [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%      
Defined Contribution Plan Employer Matching Contribution Percent 6.00%