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Stock Option Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Deferred compensation (in shares) | 112,603 |  |  |  |  |  |  | 5,017 |
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) |  | 1,645 | 48,772 | 485 | 22,005 | 2,647 | 8,088 |  |
Stock option expense |  |  |  |  |  |  |  | $ 1.3 |
Future expense | $ 2.9 | $ 2.9 |  |  |  |  |  | $ 2.9 |
Closing share price (in usd per share) | $ 54.51 | $ 54.51 |  |  |  |  |  | $ 54.51 |
Granted (in shares) | 1,319,614 | 1,319,614 |  |  |  |  |  | 1,319,614 | 1,114,169
Weighted average remaining contractual life of the Company's outstanding options |  |  |  |  |  |  |  | 7 years 2 months 12 days |
Weighted average remaining contractual life of the Company's exercisable options |  |  |  |  |  |  |  | 6 years 1 month 6 days |
2016 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) | 210,875 | 210,875 |  |  |  |  |  | 210,875 |
2017 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) | 227,500 | 227,500 |  |  |  |  |  | 227,500 |
2019 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) | 260,000 | 260,000 |  |  |  |  |  | 260,000 |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) |  |  |  |  |  |  |  | 7,058 |
Employee Stock Option |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  | 10 years |
Officers | Employee Stock Option |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 4 years |

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