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Equity Plan - Information Related to the Equity Plans for each of the Last Three Years (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Information Related to the Equity Plans |  |
Cash received from option exercise | $ 1,490 | $ 566
Options |  |
Information Related to the Equity Plans |  |
Intrinsic value of options exercised | 2,057,914 | 392,127
Cash received from option exercise | 1,489,991 | 566,197
Tax benefit realized from option exercises | $ 33,783 | $ 102,786
Weighted average fair value of options granted (in dollars per share) | $ 1.15 | $ 1.91

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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=120381028&loc=d3e5070-113901 + Details
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