Net Income per Share - Schedule of Components Used in Diluted and Basic Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator [Abstract]
Net income (in dollars)	$ 77,746us-gaap_NetIncomeLoss	$ 72,800us-gaap_NetIncomeLoss
Denominator [Abstract]
Shares used for basic net income per share	178,545	178,705
Effect of dilutive securities:
Convertible senior notes	0	0
Warrants related to issuance of convertible senior notes	0	0
Shares used for diluted net income per share	180,825	182,038
Basic net income per share (in dollars per share)	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share)	$ 0.43us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted
Stock options
Effect of dilutive securities:
Dilutive securities	996	1,382
RSUs and deferred stock units
Effect of dilutive securities:
Dilutive securities	1,284	1,951

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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