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LEASE COMMITMENTS - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
LEASE COMMITMENTS        
Rent expense under operating leases   $ 7,800   $ 15,900
Components of lease expense:        
Operating lease cost $ 5,437   $ 11,441  
Finance lease cost:        
Amortization of right-of-use assets 1,004   1,876  
Interest on lease liabilities 325   640  
Total finance lease cost 1,329   2,516  
Short-term lease and variable lease costs $ 2,328   $ 4,270