LEASES Operating Lease Maturity Table (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 51,750
Lessee, Operating Lease, Liability, Payments, Due Year Two	94,050
Lessee, Operating Lease, Liability, Payments, Due Year Three	83,165
Lessee, Operating Lease, Liability, Payments, Due Year Four	61,550
Lessee, Operating Lease, Liability, Payments, Due Year Five	48,742
Lessee, Operating Lease, Liability, Payments, Due after Year Five	55,794
Lessee, Operating Lease, Liability, Payments, Due	395,051
Aircraft Type Lease Arrangement [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	47,496
Lessee, Operating Lease, Liability, Payments, Due Year Two	87,201
Lessee, Operating Lease, Liability, Payments, Due Year Three	77,440
Lessee, Operating Lease, Liability, Payments, Due Year Four	57,126
Lessee, Operating Lease, Liability, Payments, Due Year Five	44,722
Lessee, Operating Lease, Liability, Payments, Due after Year Five	32,400
Lessee, Operating Lease, Liability, Payments, Due	346,385
Other Operating Lease Arrangement [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	4,254
Lessee, Operating Lease, Liability, Payments, Due Year Two	6,849
Lessee, Operating Lease, Liability, Payments, Due Year Three	5,725
Lessee, Operating Lease, Liability, Payments, Due Year Four	4,424
Lessee, Operating Lease, Liability, Payments, Due Year Five	4,020
Lessee, Operating Lease, Liability, Payments, Due after Year Five	23,394
Lessee, Operating Lease, Liability, Payments, Due	$ 48,666