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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
2022 (excluding the six months ended June 30, 2022)	$ 11,451	$ 11,451
Year 1	18,831	18,831	$ 20,474
Year 2	17,294	17,294	17,941
Year 3	14,461	14,461	16,634
Year 4	10,349	10,349	13,640
Year 5			9,610
Thereafter	69,233	69,233
Thereafter			65,902
Total lease payments	141,619	141,619	144,201
Less imputed interest	(41,765)	(41,765)	(42,333)
Total	$ 99,854	$ 99,854	$ 101,868
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent
Finance lease liability
2022 (excluding the six months ended June 30, 2022)	$ 651	$ 651
Year 1	1,307	1,307	$ 1,269
Year 2	1,198	1,198	1,278
Year 3	992	992	1,169
Year 4	547	547	975
Year 5			484
Thereafter			3,145
Thereafter	3,145	3,145
Total lease payments	7,840	7,840	8,320
Less imputed interest	(2,085)	(2,085)	(2,268)
Finance lease liability	$ 5,755	$ 5,755	$ 6,052
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent	Lease Liability, Current, Lease Liability, Noncurrent
Maturities of future undiscounted lease payments
2022 (excluding the six months ended June 30, 2022)	$ 2,776	$ 2,776
2023	5,024	5,024
2024	4,633	4,633
2025	4,518	4,518
2026	4,179	4,179
Thereafter	10,758	10,758
Total future lease payments	31,888	31,888
Network asset
Finance lease liability
Lease income	$ 1,900	$ 2,900

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