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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on offering date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Gross number of share options (or share units) granted during the period.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Capital Stock (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Apr. 02, 2018
Common stock
Common Stock- Shares Authorized	80,000,000		80,000,000
Common Stock- Shares Issued	45,433,115		45,124,309
Common Stock- Shares Outstanding	37,687,608		37,378,802
Preferred Stock
Preferred stock issued or outstanding	0
Preferred Stock - Shares Authorized	5,000,000		5,000,000
Employee Stock Purchase Plan (as amended, the ESPP)
Total amount of common stock issued under ESOP	890,762
Employee Stock Purchase Plan Shares Authorized	1,050,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	85.00%
Stock issued during the year, Shares, Employee Stock Purchase Plans	0
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
Target number of these restricted stock units	383,827
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,691,304	4,899,228
Weighted Average Estimated Black Scholes Value Of Option Grants	$ 1.58
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ (421)	$ (5)
Maximum percentage of target number of restricted stock units	150.00%
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value	$ 3.8
Stock options, Granted	559,909	0
Market Condition Restricted Stock Unit [Member]
Employee Stock Purchase Plan (as amended, the ESPP)
Target number of these restricted stock units	75,514
Stock options, Granted		0
Deferred stock awards of Market Condition RSU, Approved May 2018 [Member]
Employee Stock Purchase Plan (as amended, the ESPP)
Target number of these restricted stock units	94,444
Maximum percentage of target number of restricted stock units	150.00%
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value	$ 4.16
Minimum [Member]
Employee Stock Purchase Plan (as amended, the ESPP)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Maximum [Member]
Employee Stock Purchase Plan (as amended, the ESPP)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years