FINANCIAL INSTRUMENTS AND FAIR VALUE (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of derivative instrument showing notional value of interest rate swaps

	Quarter Ended March 31,
	2013		2012
Balance, beginning of the period	$	—	$	7,667
New contracts		—		—
Matured contracts		—		(834	)
Balance, end of the period	$	—	$	6,833

Schedule of derivatives not designated as hedging instruments included in condensed consolidated statement of comprehensive earnings

	Quarter Ended March 31,					Location of Loss (Gain) Recognized in Income
	2013		2012
Periodic settlements	$	—	$	31		Interest expense
Change in fair value	$	—	$	(28	)	Interest expense

Schedule of fair value measured on recurring basis

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
March 31, 2013
Money market funds	$	477	$	—	$	—	$	477
Marketable securities		18,327		—		—		18,327
Total assets	$	18,804	$	—	$	—	$	18,804
December 31, 2012
Money market funds	$	477	$	—	$	—	$	477
Marketable securities		11,319		—		—		11,319
Total assets	$	11,796	$	—	$	—	$	11,796