Quarterly report pursuant to Section 13 or 15(d)

LEASES (Lease Related Costs) (Details)

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LEASES (Lease Related Costs) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Finance lease cost        
Amortization of right-of-use assets $ 1,280 $ 1,485 $ 2,747 $ 3,016
Interest on lease liabilities 296 246 622 587
Total finance lease cost 1,576 1,731 3,369 3,603
Operating lease cost        
Operating lease cost 7,666 9,002 16,570 18,269
Short-term lease cost 170 421 510 848
Variable lease cost 5,622 1,541 9,630 4,331
Total operating lease cost 13,458 10,964 26,710 23,448
Total lease cost $ 15,034 $ 12,695 $ 30,079 $ 27,051