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Equity, Non-vested Stock Option Activity (Details) - Stock Options - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Status of the Company's non-vested options and changes during the year |  |  |
Options at the beginning of the period (in shares) | 19,289,500 |  |
Options granted (in shares) | 6,181,700 | 6,302,100 | 7,029,600
Options vested (in shares) | (6,244,460) |  |
Options forfeited (in shares) | (209,910) |  |
Options at the end of the period (in shares) | 19,016,830 | 19,289,500 |
Weighted Average Fair Value at Grant Date |  |  |
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) | $ 9.73 |  |
Weighted average fair value at grant date, options granted (in dollars per share) | 12.26 | $ 12.82 | $ 8.78
Weighted average fair value at grant date, options vested (in dollars per share) | 9.18 |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) | 10.62 |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) | $ 10.72 | $ 9.73 |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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