FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis

	Level 1		Level 2			Level 3			Total
September 30, 2013:
Money market funds(1)	$	5,005	$	—		$	—		$	5,005
Liabilities:
Interest rate swaps (note 5)		—		(303	)		—			(303	)
Asset retirement obligation(2) (note 6)		—		—			(1,337	)		(1,337	)
December 31, 2012:
Money market funds(1)		5,003		—			—			5,003

(1) Included in “Cash and cash equivalents” in the accompanying consolidated balance sheets as of September 30, 2013 and December 31, 2012. Unrealized gains and losses on money market funds were nominal due to the short-term nature of the investments.

(2) We calculated the fair value of the asset retirement obligation by discounting the estimated amount using the current two-year Treasury bill rate adjusted for our credit non-performance risk.

Schedule of asset retirement obligation

Balance, January 1, 2013	$	—
Accrued estimated obligation, less fair value adjustment		2,813
Subsequent revision of estimated obligation		(1,519	)
Accretion		43
Balance, September 30, 2013	$	1,337

Schedule of fair value of term loan and revolving credit facility

	September 30,						December 31,
	2013						2012
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Term loan		$	62,875		$	62,628		$	65,500		$	65,180
Revolving credit facility			50,500			50,292			30,501			30,342