SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Fair value assumptions used in computation of grant date fair value of options
Number of options granted (in shares)	22,000	113,000	34,000	113,000
Grant date fair value of options granted per share (in dollars per share)	$ 17.76	$ 20.24	$ 17.53	$ 20.24
Weighted average exercise price of options granted (in dollars per share)	$ 31.16	$ 35.51	$ 30.61	$ 35.51
Volatility (as a percent)	59.00%	57.00%	59.00%	57.00%
Risk free interest rate (as a percent)	2.40%	3.30%	2.50%	3.30%
Expected term (in years)	6.3	6.3	6.3	6.3
Expected annual dividends	$ 0	$ 0	$ 0	$ 0
Restricted stock units (RSUs) granted in period (in units)	123,000
Value of restricted stock units (RSUs) granted	4,400,000
Weighted average vesting term of restricted stock units (RSUs) (in years)	1.8Y
Allocation of share-based compensation expense
Recognized compensation costs	1,900,000	1,200,000	3,200,000	2,200,000
Unrecognized compensation costs related to unvested options, restricted stock awards and RSUs	$ 11,500,000		$ 11,500,000
Weighted average vesting period for recognition of compensation costs (in years)			2.1

The fair value of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average price at which grantees can acquire the shares reserved for issuance of stock options awarded under the plan during the reporting period.

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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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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 weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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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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Net number of share options (or share units) granted during the period.

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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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