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Stock Based Awards and Other Equity Instruments - Summary of Stock Option Activity (Details) - Stock Options - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Options Outstanding |  |  |  |  |
Options Outstanding, Beginning balance |  | 6,041 | 6,853 | 5,818 |
Options Outstanding, Granted |  | 752 | 762 | 2,333 | [1]
Options Outstanding, Exercised | [2] | (195) | (1,162) | (496) |
Options Outstanding, Cancelled or expired |  | (581) | (412) | (802) |
Options Outstanding, Ending balance |  | 6,017 | 6,041 | 6,853 |
Options Outstanding, Exercisable |  | 3,425 |  |  |
Options Outstanding, Vested and expected to vest | [3] | 6,017 |  |  |
Weighted Average Exercise Price per share |  |  |  |  |
Options Outstanding, Weighted Average Exercise Price, Beginning Balance |  | $ 54.00 | $ 52.78 | $ 57.60 |
Options Granted, Weighted Average Exercise Price |  | 48.30 | 43.53 | 40.03 | [1]
Options Exercised, Weighted Average Exercise Price | [2] | 42.17 | 37.26 | 29.37 |
Options Cancelled or expired, Weighted Average Exercise Price |  | 56.97 | 61.46 | 65.13 |
Options Outstanding, Weighted Average Exercise Price, Ending balance |  | 50.27 | $ 54.00 | $ 52.78 |
Options Exercisable, Weighted Average Exercise Price |  | 57.27 |  |  |
Options Vested and expected to vest, Weighted Average Exercise Price | [3] | $ 50.27 |  |  |
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value |  |  |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life |  |  | 5 years 10 months 24 days |  |
Options Exercisable, Weighted Average Remaining Contractual Life |  |  | 4 years 2 months 12 days |  |
Options Vested and expected to vest, Weighted Average Remaining Contractual Life | [3] |  | 5 years 10 months 24 days |  |
[1] | Inclusive of 780,000 stock options awarded to our Chief Executive Officer and President, or CEO, during November 2017. The estimated grant-date fair value per option, using a Black-Scholes option pricing model was $17.33. These stock options shall vest in equal installments on each of August 1, 2021 and August 1, 2022, subject to the CEO’s continuous employment with, or performance of services for, the Company. The estimated grant-date fair value of this award will be amortized on a straight-line basis over the requisite service period through August 1, 2022.
[2] | Inclusive of 120,112, 814,635, and 294,410 stock options as of December 31, 2019, 2018 and 2017, respectively, which were not converted into shares due to net share settlement in order to cover the aggregate exercise price and the required amount of employee withholding taxes. Potential shares which had been convertible under stock options that were withheld under net share settlement remain in the authorized but unissued pool under the 2018 Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.
[3] | The Company accounts for forfeitures as they occur, rather than estimate expected forfeitures as allowed under GAAP and therefore do not include a forfeiture rate in our vested and expected to vest calculation unless necessary for a performance condition award.

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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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