LONG-TERM DEBT - LINE OF CREDIT (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Line of Credit Facility [Line Items]
Line of credit facility, minimum asset requirement	500
Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of credit facility, 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, 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
Scenario, Previously Reported [Member] | Secured by other [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date	Mar. 31, 2014