Maximum period of implied volatility of long-term exchange-traded options.

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Minimum period of implied volatility of long-term exchange-traded options.

+ References

No definition available.

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- Definition

The weighted average fair value of shares issued under the ESPP as determined under the Black Scholes option pricing model.

+ References

No definition available.

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- Definition

Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares).

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No definition available.

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Face amount or stated value per share of common stock.

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Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

+ References

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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- Definition

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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CAPITAL STOCK, Stock Options (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
CAPITAL STOCK, Stock Options (Details) (USD $)	Nov. 30, 2014	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,750,000
Common Stock, Par or Stated Value Per Share	$ 0.01
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	$ 2,300,000	$ 1,500,000	$ 500,000	$ 4,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		3,267,184		3,267,184
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				1 year
Employee Stock Option [Member]
Stock Option Activity [Roll Forward]
Options outstanding at beginning of period (in shares)				4,726,415
Granted (in shares)				2,097,350
Exercised (in shares)				(25,505)
Forfeited or canceled (in shares)				(1,234,149)
Options outstanding at end of period (in shares)		5,564,111		5,564,111
Options vested at end of period or expected to vest (in shares)		5,272,012		5,272,012
Options exercisable at end of period (in shares)		3,044,259		3,044,259
Weighted-average exercise price, options outstanding at beginning of period (in dollars per share)				$ 14.18
Weighted-average exercise price, options granted (in dollars per share)				$ 7.54
Weighted-average exercise price, options exercised (in dollars per share)				$ 9.79
Weighted-average exercise price, options forfeited or canceled (in dollars per share)				$ 16.44
Weighted-average exercise price, options outstanding at end of period (in dollars per share)		$ 11.20		$ 11.20
Weighted-average exercise price, options vested at December 31, 2010 or expected to vest (in dollars per share)		$ 11.38		$ 11.38
Weighted-average exercise price, options exercisable at December 31, 2010 (in dollars per share)		$ 13.81		$ 13.81
Weighted-average remaining contractual term of options outstanding (in years)				4 years 303 days
Weighted-average remaining contractual term of options vested or expected to vest (in years)				4 years 259 days
Weighted-average remaining contractual term of options exercisable (in years)				3 years 332 days
Aggregate intrinsic value options outstanding		24,940,000		24,940,000
Aggregate intrinsic value options vested or expected to vest		23,086,000		23,086,000
Aggregate intrinsic value options exercisable		9,144,000		9,144,000
Employee Stock Option [Member] \| Time-based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of implied volatility of long-term exchange-traded options, minimum				9
Stock Option Activity [Roll Forward]
Period of implied volatility of long-term exchange-traded options, maximum				39
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	933,750
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	$ 31,250
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield (in hundredths)				0.00%	0.00%	0.00%
Stock Option Activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				1.24%	0.87%	0.94%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				50.30%	50.10%	52.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				4 years 58 days	4 years 248 days	4 years 204 days
Share-based Compensation Arrangements, Weighted-average fair value of shares issued, per share				$ 3.03	$ 3.33	$ 4.89
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Minimum [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Maximum [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years