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COMMITMENTS (Details) - Aircraft
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 93 111
ACS Aero 1 Alpha Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Aircraft 76B-26329 Inc. [Member] | Boeing 767 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Aircraft 76B-27615 Inc. [Member] | Boeing 767 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Aircraft 76B-28206 Inc. [Member] | Boeing 767 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Aviacion Centaurus, A.I.E. [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 3 3
Aviacion Centaurus, A.I.E. 1 [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Aviacion Real A.I.E. [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Aviacion Real A.I.E. 1 [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Aviacion Triton A.I.E. [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 3 3
Avolon Aerospace AOE 19 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Avolon Aerospace AOE 20 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Avolon Aerospace AOE 6 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Avolon Aerospace AOE 62 Limited [Member] | Boeing 777 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Avolon Aerospace AOE 100 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases  
Avolon Aerospace AOE 100 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2  
AWAS 5234 Trust [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Baker & Spice Aviation Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Bank of America [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
Bank of Utah [Member] | Boeing 787 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2
CIT Aerospace International [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 2
ECAF I 1215 DAC [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
ECAF I 2838 DAC [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
ECAF I 40589 DAC [Member] | Boeing 777 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Eden Irish Aircr Leasing MSN 1459 [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
GECAS Sverige Aircraft Leasing Worldwide AB [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
GFL Aircraft Leasing Netherlands B.V. [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
IC Airlease One Limited [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
JSA Aircraft 38484, LLC [Member] | Boeing 787 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
JSA Aircraft 7126, LLC [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
JSA Aircraft 7128, LLC [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
JSA Aircraft 7239, LLC [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
JSA Aircraft 7298, LLC [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Macquarie Aerospace Finance 5125-2 Trust [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Macquarie Aerospace Finance 5178 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Magix Airlease Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
MASL Sweden (8) AB [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Merlin Aviation Leasing (Ireland) 18 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Merlin Aviation Leasing (Ireland) 7 Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
NBB Cuckoo Co., Ltd [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
NBB Grosbeak Co., Ltd [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
NBB Redstart Co. Ltd [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
NBB-6658 Lease Partnership [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
NBB-6670 Lease Partnership [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Orix Aviation Systems Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 4 5
PAAL Aquila Company Limited [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
PAAL Gemini Company Limited [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
SASOF II (J) Aviation Ireland Limited [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Shenton Aircraft Leasing Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1 1
Sky High XXIV Leasing Company Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 5 5
Sky High XXV Leasing Company Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
SMBC Aviation Capital Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 4 6
SMBC Aviation Capital Limited [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases   2
Sunflower Aircraft Leasing Limited [Member] | Airbus A321 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2  
TC-CIT Aviation Ireland Limited [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1
Volito Aviation August 2007 AB [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
Volito Aviation November 2006 AB [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
Volito November 2006 AB [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
Wells Fargo Bank North National Association [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases   3
Wells Fargo Bank North National Association [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2  
Wells Fargo Bank Northwest National Association [Member] | Airbus A320 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 5 7
Wells Fargo Bank Northwest National Association [Member] | Airbus A350 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 2
Wells Fargo Bank Northwest National Association [Member] | Boeing 767 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 2 3
Wells Fargo Bank Northwest National Association [Member] | Boeing 777 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 4 6
Wells Fargo Bank Northwest National Association [Member] | Boeing 787 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 11 11
Wells Fargo Bank Northwest National Association [Member] | Airbus A350 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases  
Wilmington Trust Company [Member] | Airbus A319 [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Number of aircraft under operating leases 1