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Stock Compensation Plans (Textual) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense recognized | $ 6,600,000 | $ 6,100,000 | $ 7,000,000.0 |  |
Restricted Stock Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
General vesting period of options granted | 3 years |  |  |  |
Restricted Stock Awards | Management and Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued (in shares) | 133,400 |  |  |  |
Restricted Stock Awards | Year 1 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual award vesting rights, percentage | 33.33% |  |  |  |
Restricted Stock Awards | Year 2 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual award vesting rights, percentage | 33.33% |  |  |  |
Restricted Stock Awards | Year 3 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual award vesting rights, percentage | 33.33% |  |  |  |
EPS PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
General vesting period of options granted | 3 years |  |  |  |
EPS PSUs | Management |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued (in shares) | 96,800 |  |  |  |
Percentage of maximum amount available for issuance | 0.00% | 23.00% | 38.00% |  |
TSR PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
General vesting period of options granted | 3 years |  |  |  |
Unrecognized compensation cost | $ 1,900,000 |  |  |  |
Number of shares issued (in shares) | 96,800 |  |  |  |
Expected term (in years) | 2 years 9 months 29 days | 2 years 9 months 29 days |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected term (in years) | 1 year | 1 year | 1 year |  |
The 2014 LT Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized to grant under LT Plan (in shares) |  |  |  |  | 1,750,000
Number of shares remained available (in shares) | 410,000 |  |  |  |
The 2014 LT Plan | Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of awards | 7 years |  |  |  |
General vesting period of options granted | 3 years |  |  |  |
Expected volatility measurement period |  |  |  | 5 years 6 months |
Unrecognized compensation cost | $ 0 |  |  |  |
Expected term (in years) |  |  |  | 5 years 6 months |
The 2014 LT Plan | Restricted Stock Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | 2,300,000 |  |  |  |
The 2014 LT Plan | EPS PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | $ 1,000,000.0 |  |  |  |
2004 ESP | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares remained available (in shares) | 51,000 |  |  |  |
Term of treasury issues | 1 year |  |  |  |

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