v2.4.0.8

Equity Incentive Plans - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended								2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Shares Available For Grant	Sep. 30, 2013 Shares Available For Grant	Dec. 31, 2012 Shares Available For Grant	Dec. 31, 2010 Shares Available For Grant	Dec. 31, 2009 Shares Available For Grant	Mar. 01, 2013 RSUs	Sep. 30, 2013 RSUs	Sep. 30, 2012 RSUs	Sep. 30, 2013 RSUs	Sep. 30, 2012 RSUs	Dec. 31, 2012 RSUs	Dec. 31, 2011 RSUs	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Dec. 31, 2012 Stock Options	Dec. 31, 2011 Stock Options	Dec. 31, 2010 Stock Options	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Dec. 31, 2012 Restricted Stock	Dec. 31, 2011 Restricted Stock	Dec. 31, 2010 Restricted Stock	Sep. 30, 2013 Replacement Performance Shares	Sep. 30, 2013 New Performance Shares	Sep. 30, 2013 Performance Shares	Sep. 30, 2013 Performance Shares	Dec. 31, 2012 1998 Equity Incentive Plan	Dec. 31, 2011 1998 Equity Incentive Plan	Dec. 31, 2012 Common Stock	Sep. 30, 2013 Maximum RSUs	Sep. 30, 2013 Maximum Stock Options	Sep. 30, 2013 Maximum Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Increase in shares available for issuance under the Equity Incentive Plan								12,800,000																														1,088,834	12,800,000
Total shares approved under the Equity Incentive Plan																																						69,900,000
Shares available for issuance under the Equity Incentive Plan								15,752,370	13,896,794	14,643,932	4,280,180	7,285,606
Vesting period																		5 years						5 years							5 years			6 months	6 months						5 years	5 years	5 years
Number of shares that RSUs convert into on the applicable vesting date																1		1
Stock options expiration period																						10 years		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period																97,254		119,422	44,904															671,400
Exercise price adjustment resulting from stock split																								50.00%
RSUs granted (shares)													594,700			924,312		1,504,410	1,643,348															671,400	275,400		946,800
Performance Period (Duration)																																					5 years
Closing stock price																																								$ 21.10
Outstanding RSUs or restricted stock, intrinsic value																		$ 49,600,000													$ 2,400,000
Outstanding stock options, intrinsic value																								132,800,000
Exercisable stock options, intrinsic value																								102,300,000
Forfeiture rates used for grants to employees																10.00%		10.00%								9.00%
Forfeiture rates used for grants to non-employee directors and executive officers																0.00%		0.00%								0.00%
Fair value of RSUs or restricted stock vested during the period																14,300,000		7,800,000	2,200,000												1,600,000	1,100,000	1,000,000
Period of time as a public company							6 years
Number of coupon issues related to the risk-free rate																										0
Dividend Yield							0.00%
Fair value of stock options vested																								7,200,000	8,600,000	7,700,000
Intrinsic value of stock options exercised																								45,300,000	24,800,000	43,200,000
Stock-based compensation expense	5,730,000	3,998,000	16,292,000	11,976,000	15,634,000	13,107,000	9,974,000							4,559,000	2,048,000	12,674,000	6,131,000	8,411,000	3,666,000	1,124,000	1,720,000	3,457,000	5,162,000	6,310,000	8,129,000	8,771,000	47,000	230,000	161,000	683,000	913,000	913,000	913,000			2,300,000	6,000,000
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Current Year	$ 5,629,000		$ 5,629,000											$ 4,459,000		$ 4,459,000				$ 1,123,000		$ 1,123,000					$ 47,000		$ 47,000							$ 2,300,000	$ 2,300,000

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- Definition

The number of interest payments, also known as coupons, made during the term of the debt instrument. A zero-coupon instrument is one that does not make periodic interest payments during its term.

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The forfeiture rate used when valuing grants to executive officers and directors.

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The number of years that the entity had been a public company prior to the equity award grant.

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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The percentage by which the exercise prices of the outstanding stock options was adjusted, resulting from the stock split during the period.

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As of the balance-sheet date, the aggregate unrecognized cost of equity awards made with employees, directors and certain consultants qualifying for treatment as employees under share-based compensation plans that have yet to vest expected to be recognized during the remainder of current year.

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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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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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 total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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