DERIVATIVE INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other comprehensive income, net of tax effect of $0.0 million, $0.0 million and $0.5 million in 2012, 2011 and 2010, respectively			$ 1,009
Unrealized gain on change in fair value of interest rate swaps recognized in other expense			1,228
Interest expense related to monthly cash settlements			(2,828)
Cash settlements included in operating cash flows	0	0	3,000
Tax effect of gain recognized	0	0	500
Interest Rate Swap Expired August 2010 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt instrument, face amount			$ 100,000