LONG-TERM DEBT - LINE OF CREDIT (DETAILS) (USD $)		1 Months Ended		3 Months Ended
	Mar. 31, 2013 credit_facility	Aug. 30, 2015 Secured by aircraft [Member]	Mar. 31, 2013 Secured by aircraft [Member]	Mar. 31, 2013 Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Number of Credit Facilities	2
Line of Credit Facility, Maximum Borrowing Capacity			$ 100,000,000	$ 100,000,000
Line of Credit Facility, Expiration Date		Aug. 30, 2015		Mar. 31, 2016
Line of Credit Facility, Asset Restrictions	$ 500,000,000