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CONVERTIBLE SENIOR NOTES (Tables)

3 Months Ended

Mar. 31, 2013

CONVERTIBLE SENIOR NOTES

Schedule of carrying amounts of the liability and equity components of the convertible notes

		March 31, 2013			December 31, 2012
Carrying amount of the equity component (additional paid-in capital)		$	24,375		$	24,375
Principal amount of the 2010 Notes		125,000			125,000
Unamortized discount of the liability component		12,903			14,082
Net carrying amount of the liability component		112,097			110,918

Schedule of effective interest rate, cash and non-cash interest expense and deferred financing cost amortization

		Three Months Ended March 31,
		2013			2012
Effective interest rate on liability component		10.0		%	10.0		%
Cash interest expense recognized		$	1,541		$	1,562
Non-cash interest expense recognized		1,179			1,091
Non-cash deferred financing amortization costs included in interest expense		177			179