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The increase in the number of authorized shares under the Plan.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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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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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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Number of share instruments newly issued under a share-based compensation plan.

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STOCK-BASED COMPENSATION (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended	1 Months Ended
STOCK-BASED COMPENSATION (Narrative) (Details) (USD $)	Dec. 31, 2014 stock_based_compensation_plan	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	May 31, 2010	Jul. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase (in shares)	1,700,000
Number of stock-based compensation plans	3
Dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value of options granted (in dollars per share)	$ 18.15	$ 13.86	$ 12.18
Cash received from option exercises	$ 15,200,000	$ 2,300,000	$ 700,000
Share-based compensation expense recognized	15,105,000	10,393,000	9,051,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable for officers, directors and employees, vesting period, in years	4 years
Stock options exercisable for directors, expiration period, in years	6 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable for employees, expiration period, in years	6 years
Stock options exercisable for directors, expiration period, in years	10 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs related to unvested awards	1,300,000
Weighted-average period for cost recognition, in years	2 years
Restricted Stock, Performance Stock and Contract Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs related to unvested awards	11,600,000
Weighted-average period for cost recognition, in years	2 years
Share-based compensation expense recognized	13,700,000	9,200,000	7,700,000
Fair value of shares vested	9,400,000	6,500,000	6,700,000
Requisite service periods of performance stock, restricted stock and contract stock awards, in years	3 years
Deferred Stock Units (SUs) \| Executive Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution of common stock to individual (in shares)				1,670,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Restricted Stock Units (RSUs) \| Non Former Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non issued vested restricted stock units (in shares)	200,000
2000 and 2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	2,000,000
2003 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	6,500,000
Increase in authorized shares (in shares)					1,750,000	750,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	1,500,000
Shares available for purchase (in shares)	1,000,000
Shares issued (in shares)	4,475	6,309	6,315
ESPP proceeds received	$ 200,000	$ 300,000	$ 200,000
Discount percentage available to participants	5.00%