INDEBTEDNESS (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Long-term debt
Write off of deferred financing fees	$ 477,000
Revolving credit facility
Long-term debt
Write off of deferred financing fees	500,000
Debt instrument fees	2,800,000
Revolving credit facility | Amendment to existing credit facility
Long-term debt
Maximum borrowing capacity	450,000,000
Maximum increase in the borrowing capacity that is available to the company, subject to certain limitations and satisfaction of certain conditions	$ 200,000,000
Revolving credit facility | Eurocurrency
Long-term debt
Basis spread on variable rate (as a percent)	1.00%
Revolving credit facility | Federal funds rate
Long-term debt
Basis spread on variable rate (as a percent)	0.50%