LEASE COMMITMENTS - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Components of lease expense:
Operating lease cost	$ 5,254	$ 6,004
Finance lease cost:
Amortization of right-of-use assets	1,199	872
Interest on lease liabilities	348	315
Total finance lease cost	1,547	1,187
Short-term lease and variable lease costs	$ 2,448	$ 1,942