LONG-TERM DEBT - LINE OF CREDIT (DETAILS) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Asset Restrictions	500
Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Expiration Date	Aug. 30, 2015
Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Expiration Date	Mar. 31, 2016
Scenario, Previously Reported [Member] | Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Mar. 29, 2013