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Capital Stock (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2018 | Jan. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Apr. 02, 2018 | Feb. 06, 2018 | May 18, 2017
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred stock purchase right terms |  |  | The Shareholder Rights Plan expired, with no rights having become exercisable, in accordance with its terms on the close of business on February 6, 2018. |  |  |  |  |
Preferred stock issued or outstanding |  |  |  |  | 0 |  |  |
Preferred stock purchase right option exercised |  |  |  |  |  |  | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date |  |  | 85.00% |  |  |  |  |
Employee Stock Purchase Plan Shares Authorized |  |  |  |  |  |  |  | 1,050,000
Stock issued during the year, Shares, Employee Stock Purchase Plans |  |  | 89,308 | 76,215 |  |  |  |
Total amount of common stock issued under ESOP |  |  | 890,762 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 20,908,929 |  |
Increase In Number Of Shares Authorized For Issuance Under Stock Option And Incentive Plan |  |  |  |  |  | 3,400,000 |  | 300,000
Target number of these restricted stock units |  |  | 639,126 | 1,298,371 |  |  |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term |  |  | 10 years |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  | 3,307,438 | 5,741,298 |  |  |  |
Common Stock Market Value Per Share On Reporting Date |  |  | $ 3.18 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value |  |  | $ 2,600 | $ 100 |  |  |  |
In The Money Stock Options Exercisable At The Reporting Date |  |  | 160,851 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  |  | $ 3,200 |  |  |  |  |
Weighted Average Estimated Black Scholes Value Of Option Grants |  |  | $ 1.83 | $ 1.32 |  |  |  |
Preferred Stock - Shares Authorized |  |  | 5,000,000 | 5,000,000 |  |  |  |
Cumulative effect adjustment to retained earnings |  | $ 100 |  | $ 0 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 1 month 13 days |  |  |  |  |
Market Condition Restricted Stock Unit [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target number of these restricted stock units |  |  | 156,944 | 0 |  |  |  |
Deferred stock awards of Market Condition RSU, Approved Aug 2015 [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares vested | 69,667 |  |  |  |  |  |  |
Deferred stock awards of Market Condition RSU, Approved May 2018 [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target number of these restricted stock units |  |  | 116,944 |  |  |  |  |
Maximum percentage of target number of restricted stock units |  |  | 150.00% |  |  |  |  |
Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 4.19 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  | 1 year |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred stock issued or outstanding |  |  | 5,000,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  | 4 years |  |  |  |  |

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