SUBSEQUENT EVENTS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013 Subsequent event	Oct. 17, 2013 Subsequent event Dividend declared Class A Common Stock
Subsequent events
Dividends declared per share: (in dollars per share)	$ 0.15	$ 0.11	$ 0.45	$ 0.33		$ 0.15
One-time pretax expense associated with employee severance and early lease termination on transportation equipment					$ 8.5