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

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

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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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Stock-Based Compensation - Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands						12 Months Ended
	Feb. 17, 2017 shares	Feb. 09, 2016 item shares	Jun. 12, 2014 shares	Jun. 09, 2011 shares	Jun. 01, 2003 shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Jun. 11, 2014 shares	Jun. 08, 2011 shares
Maximum
Performance shares
Vesting period						4 years
Employee stock options
Stock-based compensation
Exercise price of options granted, low end of range (in dollars per share) \| $ / shares						$ 6.96
Exercise price of options granted, high end of range (in dollars per share) \| $ / shares						$ 20.75
Number of Option Shares
Outstanding at the beginning of the period (in shares)						6,326,593
Granted (in shares)						1,486,790
Exercised (in shares)						(1,226,345)
Canceled (in shares)						(35,724)
Outstanding at the end of the period (in shares)						6,551,314	6,326,593
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) \| $ / shares						$ 11.17
Granted (in dollars per share) \| $ / shares						14.26
Exercised (in dollars per share) \| $ / shares						8.81
Canceled (in dollars per share) \| $ / shares						14.38
Outstanding at the end of the period (in dollars per share) \| $ / shares						$ 12.29	$ 11.17
Additional disclosures
Weighted-Average Remaining Contractual Term						3 years 11 months 23 days
Aggregate Intrinsic Value (in dollars) \| $						$ 124,709
Weighted-average grant-date fair value of options granted (in dollars per share) \| $ / shares						$ 4.48	$ 3.97
Aggregate intrinsic value of stock options exercised (in dollars) \| $						$ 15,800	$ 10,300	$ 19,500
Number of Option Shares						3,106,177
Weighted-Average Exercise Price (in dollars per share) \| $ / shares						$ 10.94
Weighted-average remaining contractual term						2 years 8 months 1 day
Aggregate intrinsic value (in dollars) \| $						$ 63,300
Employee stock options \| Minimum
Stock-based compensation
Contractual lives of options granted						4 years
Employee stock options \| Maximum
Stock-based compensation
Contractual lives of options granted						10 years
Stock appreciation rights (SARs)
Performance shares
Vesting period						4 years
Restricted Stock
Performance shares
Awarded (in shares)						176,865
Performance Shares
Performance shares
Awarded (in shares)	172,245
2003 Plan \| Maximum
Stock-based compensation
Number of shares of common stock available for awards					12,000,000
2003 Plan \| Incentive stock options \| Minimum
Stock-based compensation
Exercise price per share as a percentage of the fair market value of the Common Stock					100.00%
2003 Plan \| Nonqualified stock options \| Minimum
Stock-based compensation
Exercise price per share as a percentage of the fair market value of the Common Stock					85.00%
2008 Plan
Stock-based compensation
Number of shares of common stock available for awards			16,350,000	9,250,000					9,250,000	2,350,000
Options available for future grants (in shares)						1,436,348
2008 Plan \| Employee stock options
Stock-based compensation
Number of shares of common stock counted against the maximum shares available for grant for each share awarded under the plan			1
2008 Plan \| Stock appreciation rights (SARs)
Stock-based compensation
Number of shares of common stock counted against the maximum shares available for grant for each share awarded under the plan			1
2008 Plan \| Restricted stock and other full value stock awards
Stock-based compensation
Number of shares of common stock counted against the maximum shares available for grant for each share awarded under the plan				2.44
Performance Share Program \| Performance Shares
Performance shares
Awarded (in shares)		189,085
Number of annual performance periods \| item		3
Service period		3 years
Increment at which shares are awarded (as a percent)		33.30%
Vesting period		3 years
Performance Share Program \| Performance Shares \| Minimum
Performance shares
Percentage of award which can potentially be earned		0.00%
Performance Share Program \| Performance Shares \| Maximum
Performance shares
Percentage of award which can potentially be earned		150.00%