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Capital Transactions - Incentive Plans and Stock Options Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2015 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options to purchase (in shares) |  | 1,110,000 |  | 1,114,000 |
Granted (in shares) |  | 0 |  |  |
Exercised (in shares) |  | 0 |  |  |
Exercised (in dollars per share) |  | $ 0.00 |  |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options to purchase (in shares) |  | 1,110,000 |  | 1,114,000 |
Aggregate Intrinsic value, outstanding |  | $ 300,000 |  | $ 200,000 |
Granted (in shares) |  | 0 |  |  |
Exercised (in shares) |  |  | 30,000 |  |
Exercised (in dollars per share) |  |  | $ 5.88 |  |
Aggregate intrinsic values of options exercised |  |  | $ 200,000 |  |
Tax benefit from the exercise of stock options |  |  | 32,000 |  |
Time-based stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 0 | $ 13,000 |  |
Unrecognized share-based compensation expense |  | $ 0 |  | $ 0 |
Time-based stock options | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 48 months |  |  |
Performance based stock options operating income margins |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Operating income margin, one (as a percent) |  | 6.00% |  |  |
Operating income margin, two (as a percent) |  | 8.00% |  |  |
Operating income margin, three (as a percent) |  | 10.00% |  |  |
Performance based stock options operating income margins | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 1 year |  |  |
Performance based stock options operating income margins | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  | 1 year 3 months |  |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unvested options outstanding (in shares) |  | 0 |  | 0 |
2012 Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized under the plan (in shares) |  |  |  |  | 1,500,000
Additional number of shares authorized under the plan (in shares) | 1,500,000 |  |  |  |
2009 Incentive Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized under the plan (in shares) |  | 400,000 |  |  |

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