LONG-TERM DEBT - LINE OF CREDIT (Details)	9 Months Ended
	Sep. 30, 2015 USD ($) credit_facility	Oct. 02, 2015 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Number of Credit Facilities | credit_facility	2
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Line of Credit Facility, Asset Restrictions	500,000,000
Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Line of Credit Facility, Expiration Date	Sep. 30, 2017
Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Line of Credit Facility, Expiration Date	Mar. 31, 2017
Subsequent Event [Member] | Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 52,000,000