STOCK OPTIONS AND STOCK AWARDS (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Valuation Assumptions and Expense Information
Stock-based compensation costs	$ 3,759	$ 3,678
Stock-based compensation costs capitalized as part of inventory	5,326	4,866
Additional disclosure
Total unrecognized stock-based compensation cost related to all share-based payments	$ 29,400
Weighted-average period over which unrecognized compensation cost will be recognized	2 years 8 months 26 days
Stock option
Weighted average assumptions:
Expected life of options	6 years 3 months	6 years 3 months
Risk-free interest rate (as a percent)	1.14%	1.05%
Expected volatility (as a percent)	49.01%	50.81%
Expected dividend yield (as a percent)	0.00%	0.00%
Additional disclosure
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 8.54

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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