SUBSEQUENT EVENTS (Details) (USD $) In Millions, except Share data, unless otherwise specified		1 Months Ended		12 Months Ended
	Dec. 31, 2011 Revolving credit facility	Jan. 31, 2011 Dividend declared	Dec. 31, 2011 Amendment to existing credit facility Revolving credit facility	Dec. 31, 2011 Stock Incentive plan 2007 Stock Incentive Plan and 2010 Stock Incentive Plan	Dec. 31, 2011 Stock Incentive plan 2007 Stock Incentive Plan and 2010 Stock Incentive Plan Board of Directors	Dec. 31, 2011 Stock Incentive plan 2007 Stock Incentive Plan and 2010 Stock Incentive Plan Key employees
Subsequent event
Quarterly cash dividend (in dollars per share)		$ 0.10
Maximum borrowing capacity	$ 500.0		$ 450.0
Increase in the available borrowing capacity subject to certain limitations and satisfaction of certain conditions			$ 200.0
Grants in period (in shares)				315,030	22,530	292,500
Period over which options vest (in years)					3	3
Vesting percentage per year of options granted						33.00%