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Stock-Based Compensation, Non-Vested Stock Option Activity (Details) - Stock Options - $ / shares | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Status of the Company's non-vested options and changes during the year |  |  |
Non-vested options at the beginning of the period (in shares) | 19,216,100 | 19,227,160 | 19,289,500
Options granted (in shares) | 31,000 | 6,105,700 | 40,000
Non-vested options, options vested (in shares) | (100,420) | (6,061,740) | (61,900)
Non-vested options, options forfeited (in shares) | (70,910) | (55,020) | (40,440)
Non-vested options at the end of the period (in shares) | 19,075,770 | 19,216,100 | 19,227,160
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) | $ 10.71 | $ 9.74 | $ 9.73
Weighted average fair value at grant date, options granted (in dollars per share) | 12.85 | 12.27 | 10.48
Weighted average fair value at grant date, options vested (in dollars per share) | 8.78 | 9.19 | 8.27
Weighted average fair value at grant date, options forfeited (in dollars per share) | 10.58 | 10.87 | 9.74
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) | $ 10.72 | $ 10.71 | $ 9.74

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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