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Stockholders' Equity - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($) $ / shares shares
Class of Stock |
Closing market price of common stock (in USD per share) | $ 34.57
Stock options |
Options Outstanding [Roll Forward] |
Outstanding, beginning balance (in shares) | shares | 4,047
Options granted (weighted average grant date fair value of $14.14 per share) (in shares) | shares | 268
Options exercised (in shares) | shares | (974)
Options forfeited or expired (in shares) | shares | (8)
Outstanding, ending balance (in shares) | shares | 3,333
Options Outstanding, Weighted Average Exercise Price [Roll Forward] |
Outstanding, beginning balance, weighted average exercise price (in USD per share) | $ 8.00
Options granted, weighted average exercise price (in USD per share) | 30.37
Options exercised, weighted average exercise price (in USD per share) | 5.93
Options forfeited or expired, weighted average exercise price (in USD per share) | 4.68
Outstanding, ending balance, weighted average exercise price (in USD per share) | 10.41
Weighted average grant date fair value, options granted (in USD per share) | $ 14.14
Outstanding, ending balance, weighted average remaining contractual life | 6 years 4 months 24 days
Outstanding, ending balance, aggregate intrinsic value | $ | $ 80,524

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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