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CONVERTIBLE SENIOR NOTES (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jul. 27, 2010
Convertible senior notes
Net carrying amount of the liability component		$ 109,726		$ 109,726		$ 106,381
Non-cash interest expense recognized				3,345	2,999
Non-cash deferred financing amortization costs included in interest expense		1,596	796	3,555	2,368
2010 Notes
Convertible senior notes
2010 Notes issued	125,000
Interest rate on convertible notes (as a percent)		5.00%		5.00%			5.00%
Carrying amount of the equity component (additional paid-in capital)		24,375		24,375		24,375
Principal amount of the 2010 Notes		125,000		125,000		125,000
Unamortized discount of the liability component		15,274		15,274		18,619
Net carrying amount of the liability component		109,726		109,726		106,381
Effective interest rate on liability component (as a percent)		10.00%	10.00%	10.00%	10.00%
Cash interest expense recognized		1,580	1,584	4,696	4,677
Non-cash interest expense recognized		1,158	1,046	3,345	2,999
Non-cash deferred financing amortization costs included in interest expense		$ 181	$ 181	$ 540	$ 538
Remaining period over which the unamortized discount will be recognized				2 years 10 months 24 days

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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