LONG-TERM DEBT - LINE OF CREDIT (DETAILS) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
Secured by aircraft [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100.0
Line of Credit Facility, Expiration Date	March 2013
Line of credit minumum asset requirement amount	500.0
Secured by other [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100.0
Line of Credit Facility, Expiration Date	March 2014
Line of credit minumum asset requirement amount	$ 500.0