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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Fair value of options granted | The following table summarizes the weighted-average assumptions used to compute the fair value of options granted to employees and members of our board of directors:
| For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 2.4% |  | 2.7% |  | 1.8%
Expected life of options — years | 3.41 |  | 4.38 |  | 4.59
Expected stock price volatility | 26% |  | 23% |  | 24%
Expected dividend yield | 0.8% |  | 0.7% |  | 0.7%
Stock options activity under share-based payment plans | The following table summarizes stock option activity under our share-based plans for the years ended December 31, 2019, 2018 and 2017:
| Options |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at the beginning of January 1, 2017 | 333 |  |  | $ | 3.50 |  |  |  |  |
Granted | 26 |  |  | $ | 5.49 |  |  |  |  |
Exercised | (73 | ) |  | $ | 3.21 |  |  |  |  |
Forfeited, cancelled or expired | (6 | ) |  | $ | 4.07 |  |  |  |  |
Outstanding as of December 31, 2017 | 280 |  |  | $ | 3.76 |  |  |  |  |
Granted | 32 |  |  | $ | 6.59 |  |  |  |  |
Exercised | (65 | ) |  | $ | 3.35 |  |  |  |  |
Forfeited, cancelled or expired | (4 | ) |  | $ | 4.76 |  |  |  |  |
Outstanding as of December 31, 2018 | 243 |  |  | $ | 4.22 |  |  |  |  |
Options granted in connection with Pandora Acquisition | 7 |  |  | $ | 3.85 |  |  |  |  |
Granted | 15 |  |  | $ | 6.10 |  |  |  |  |
Exercised | (53 | ) |  | $ | 3.65 |  |  |  |  |
Forfeited, cancelled or expired | (4 | ) |  | $ | 5.58 |  |  |  |  |
Outstanding as of December 31, 2019 | 208 |  |  | $ | 4.46 |  |  | 5.58 |  | $ | 560 |
Exercisable as of December 31, 2019 | 148 |  |  | $ | 3.96 |  |  | 4.77 |  | $ | 472 |
Summary of restricted stock unit and stock award activity | The following table summarizes the restricted stock unit, including PRSU, activity under our share-based plans for the years ended December 31, 2019, 2018 and 2017:
| Shares |  | Grant Date Fair Value Per Share
Nonvested at the beginning of January 1, 2017 | 30 |  |  | $ | 4.03 |
Granted | 12 |  |  | $ | 5.35 |
Vested | (9 | ) |  | $ | 3.92 |
Forfeited | (2 | ) |  | $ | 4.42 |
Nonvested as of December 31, 2017 | 31 |  |  | $ | 4.54 |
Granted | 18 |  |  | $ | 6.40 |
Vested | (13 | ) |  | $ | 4.43 |
Forfeited | (1 | ) |  | $ | 4.99 |
Nonvested as of December 31, 2018 | 35 |  |  | $ | 5.50 |
Units granted in connection with Pandora Acquisition | 48 |  |  | $ | 5.83 |
Granted | 38 |  |  | $ | 6.01 |
Vested | (38 | ) |  | $ | 5.53 |
Forfeited | (8 | ) |  | $ | 5.85 |
Nonvested as of December 31, 2019 | 75 |  |  | $ | 5.95 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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