FUEL DERIVATIVE CONTRACTS Fair value Fuel Derivative Contracts (Details) (Subsequent Event [Member], Commodity Contract [Member])	Nov. 21, 2013 gal
Subsequent Event [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Nonmonetary notional amount	700,000
Diesel fuel need in derivative contracts (in hundredths)	20.00%

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant