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Earnings Per Common Share - Narrative (Details) - shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |  |  |
Stock Issued During Period, Shares, Acquisitions | 435,457 |  |  |
Weighted Average Number Diluted Shares Outstanding Adjustment |  | 122,507 | 94,779 | 72,607
2017 Employees Long Term Incentive Plan [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 48,053 |  |
2013 Long Term Incentive Plan [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 61,690 | 45,788 | 41,550
Common Shares |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  | 435,457 |  |
Treasury Stock, Shares, Acquired |  | 50,000 | 70,000 | 0
Restricted Stock Units (RSUs) [Member] | 2017 Employees Long Term Incentive Plan [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 13,637 |  |

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