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LEASE COMMITMENTS - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
Operating lease right-of-use assets $ 76,996 $ 83,222  
Operating lease liability, current $ 16,727    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent    
Operating lease liabilities $ 59,192 $ 61,331  
Total operating lease liabilities 75,919    
Finance Leases      
Finance leases included in property, plant and equipment, gross 43,117    
Accumulated depreciation of finance leases included in property, plant and equipment, net (2,088)    
Total finance leases $ 41,029    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment, Net    
Current portion of finance lease liabilities $ 4,095    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Long-term Debt and Capital Lease Obligations, Current    
Noncurrent portion of finance lease liabilities $ 24,163    
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term Debt and Capital Lease Obligations    
Total finance lease liabilities $ 28,258   $ 8,353
Weighted Average Remaining Lease Term (in years)      
Operating leases 6 years 1 month 6 days    
Finance leases 7 years 1 month 6 days    
Weighted Average Discount Rate      
Operating leases 5.12%    
Finance leases 5.38%