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Earnings Per Share and Other Equity Related Information - Narrative (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Aug. 31, 2019 | Feb. 28, 2017 | Apr. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options excluded from calculation of dilutive shares as the effect would be anti-dilutive (in shares) | 431,000 | 293,000 |  |  |
Stock-based compensation expense | $ 429,000 | $ 385,000 |  |  |
Stock Options |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Non-vested stock options unrecognized compensation expense | $ 10,757,000 |  |  |  |
Non-vested stock options unrecognized compensation expense, weighted-average period of recognition | 3 years |  |  |  |
Options granted in period (in shares) | 196 |  |  |  |
Stock options, contractual period | 10 years |  |  |  |
Stock options, vesting period | 5 years |  |  |  |
Common Class A |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  | $ 17,553,000 | $ 15,000,000 | $ 10,000,000
Treasury Stock |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Open market purchase of common shares (in shares) | 455 | 0 |  |  |

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