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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