SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common Stock, Value, Issued		$ 385	$ 382
Common stock, shares authorized		90,000,000	90,000,000
Subsequent Event [Member] | Columbia Helicopters, Inc [Member]
Subsequent Event [Line Items]
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	$ 492,400
Common stock, par value (in dollars per share)	$ 0.01
Common Stock, Value, Issued	$ 67,000
Common Stock, Basis Of Value Calculation, Period	5 days
Common stock, shares authorized	6,200,000
Business Combination, Termination Fee	$ 20,000
Business Combinations, Stockholders Agreement, Common Stock Transfer Period	9 months
Business Combinations, Stockholders Agreement, Standstill Provision Restriction Period	12 months
Business Combinations, Stockholders Agreements, Purchase Restriction Voting Common Stock Percentage	2.00%
Business Combinations, Stockholders Agreement, Beneficial Ownership Termination Period	20 days
Business Combination, Stockholders Agreement Beneficial Ownership, Percentage	7.50%
Common Stock, Value, Subscriptions	$ 10,000
Common Stock, Shares Subscribed but Unissued	900,000
Subsequent Event [Member] | Columbia Helicopters, Inc [Member] | Bridge Loan | Bridge Loan Facility [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 360,000
Subsequent Event [Member] | Columbia Helicopters, Inc [Member] | Convertible Debt | Convertible Notes Commitment Letter [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount	135,000
Subsequent Event [Member] | Columbia Helicopters, Inc [Member] | Convertible Debt | Convertible Notes Commitment Letter [Member] | Call Option [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 15,000