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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Stockholders' Equity | Stockholders’ Equity We grant options and awards to employees and non-employee directors pursuant to a stockholder approved stock incentive plan, which is described in further detail in Note 8, Stockholders' Equity, of Notes to Consolidated Financial Statements in our 2018 Annual Report. The following is a summary of our stock option and restricted stock activity and related information:
| Stock Options |  |  |  | Restricted Stock Awards |  |
| Shares |  | Weighted-Average Exercise Price |  | Shares |  | Weighted-Average Grant Date Fair Value
Balance as of December 31, 2018 | 1,736,304 |  | $ | 66.71 |  | 132,273 |  | $ | 130.63
Granted | 283,387 |  | 118.04 |  | 60,857 |  | 115.83
Options exercised/RSUs vested | (92,036) |  | 21.26 |  | (66,078) |  | 106.42
Balance as of March 31, 2019 | 1,927,655 |  | $ | 76.43 |  | 127,052 |  | $ | 136.13
As of March 31, 2019, outstanding options to purchase 1.3 million shares were exercisable with a weighted average exercise price per share of $51.36. Employee Stock Purchase Plan The price at which common stock is purchased under the Amended Employee Stock Purchase Plan, or ESPP, is equal to 85% of the fair market value of the common stock on the first or last day of the offering period, whichever is lower. As of March 31, 2019, 64,008 shares were available for future purchases under the ESPP.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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