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Stock-Based Compensation - Summary of Stock Options Outstanding (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Number of Shares
December 31, 2017 (in shares) | shares	2,374
Granted (in shares) | shares	169
Exercised (in shares) | shares	(262)
Forfeited (in shares) | shares	(60)
Expired (in shares) | shares	(4)
September 30, 2018 (in shares) | shares	2,217
Weighted Average Exercise Price
December 31, 2017 (in dollars per share) | $ / shares	$ 29.22
Granted (in dollars per share) | $ / shares	52.06
Exercised (in dollars per share) | $ / shares	26.07
Forfeited (in dollars per share) | $ / shares	35.45
Expired (in dollars per share) | $ / shares	25.41
September 30, 2018 (in dollars per share) | $ / shares	$ 31.17

X

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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