STOCK OPTIONS AND STOCK AWARDS (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Common stock options	Jun. 30, 2012 Common stock options	Jun. 30, 2013 Common stock options	Jun. 30, 2012 Common stock options
Valuation Assumptions and Expense Information
Stock-based compensation costs	$ 7,976	$ 7,572
Stock-based compensation costs capitalized as part of inventory	5,709		4,866
Weighted average assumptions:
Expected life of options				6 years 3 months 29 days	6 years 4 months 2 days	6 years 3 months 7 days	6 years 3 months 4 days
Risk-free interest rate (as a percent)				1.26%	0.97%	1.17%	1.04%
Expected volatility (as a percent)				48.17%	50.24%	48.83%	50.74%
Expected dividend yield (as a percent)				0.00%	0.00%	0.00%	0.00%
Additional disclosure
Weighted-average grant-date fair value of options granted (in dollars per share)						$ 8.40
Total unrecognized stock-based compensation cost related to all share-based payments	$ 29,700
Weighted-average period over which unrecognized compensation cost will be recognized	2 years 7 months 10 days