LONG-TERM DEBT - LINE OF CREDIT (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100
Line of Credit Facility, Expiration Date	March 2013
Line of credit minumum asset requirement amount	500
Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100
Line of Credit Facility, Expiration Date	March 2016