Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES Narrative (Details)

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COMMITMENTS AND CONTINGENCIES Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2014
Jun. 30, 2015
USD ($)
helicopter
Jun. 30, 2015
USD ($)
helicopter
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Total unfunded capital commitments   $ 175.0 $ 175.0
Purchase commitments payable during the period   66.4 66.4
Deposits paid on options not yet exercised   1.7 1.7
Potential reduction amount of liability   106.7 106.7
Liquidated amount liability   2.5 2.5
Aircraft maintenance credits period 4 years    
Aircraft Maintenance Credits Utilized for the Period   $ 1.2 $ 2.5
Minimum      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Expected Duration of Aircraft Maintenance Credits 12 months    
Maximum      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Expected Duration of Aircraft Maintenance Credits 15 months    
AW189 Heavy Helicopters      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Number of helicopters (in helicopters) | helicopter   9 9
Additional number of helicopters (in helicopters) | helicopter   10 10
S92 Heavy Helicopters      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Number of helicopters (in helicopters) | helicopter   4 4
Additional number of helicopters (in helicopters) | helicopter   4 4
AW169 Light Twin Helicopters      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Number of helicopters (in helicopters) | helicopter   5 5