LEASES - Components of Lease Expense and Supplemental Cash Flow Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Components of lease expense:
Operating lease cost	$ 23,163
Supplemental cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	20,856
Supplemental non-cash information on lease liabilities arising from obtaining right-of-use assets	$ 22,403
Weighted average remaining lease term	6 years 9 months 18 days
Weighted average discount rate	3.01%