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Equity Compensation Plans - Options (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Equity Compensation Plans |  |  |  |
Total compensation cost |  | $ 1.9 | $ 1.7 |
Exercised (in shares) | 4,500 |  |  |
Shares |  |  |  |
Exercised (in shares) | (4,500) |  |  |
Aggregate Intrinsic Value |  |  |  |
Exercised (in dollars) | $ (27,000) |  |  |
2014 Plan |  |  |  |
Equity Compensation Plans |  |  |  |
Number of shares authorized | 600,000 | 600,000 |  |
Employee and Nonemployee Stock Options [Member] |  |  |  |
Equity Compensation Plans |  |  |  |
Granted (in shares) |  |  | 0 |
Term of stock options granted |  | 10 years |  |
Exercised (in shares) |  | 4,500 |  |
Total unrecognized compensation cost | $ 0 | $ 0 |  |
Shares |  |  |  |
Beginning outstanding (in shares) |  | 4,500 |  |
Exercised (in shares) |  | (4,500) |  |
Ending outstanding (in shares) |  |  |  | 4,500
Weighted Average Exercise Price |  |  |  |
Beginning outstanding (in dollars per share) |  | $ 7.49 |  |
Exercised (in dollars per share) | $ 7.49 |  |  |
Ending outstanding (in dollars per share) |  |  |  | $ 7.49
Weighted Average Remaining Contractual Term (years) |  |  |  |
Ending outstanding (in years) |  | 0 years |  | 1 month 6 days
Aggregate Intrinsic Value |  |  |  |
Ending outstanding (in dollars) |  |  |  | $ 25,000
Restricted Stock and Restricted Stock Units [Member] |  |  |  |
Equity Compensation Plans |  |  |  |
Vesting period |  | 3 years |  |

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