LEASES - Leased assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Operating lease assets	$ 43,607	$ 51,474
Finance right-of-use lease assets	17,290	21,209
Total	60,897	72,683
Finance leased assets - accumulated amortization	13,300	8,000
Liabilities:
Operating lease, current	15,799	17,048
Finance lease, current	$ 4,969	$ 4,462
Finance Lease, Liability, Current	Accrued liabilities	Accrued liabilities
Long-term operating lease liabilities	$ 28,477	$ 35,069
Finance lease, long term	$ 12,108	$ 17,501
Finance Lease, Liability, Noncurrent	Other long-term liabilities	Other long-term liabilities
Total	$ 61,353	$ 74,080