Capital Stock (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Opening Balance Stock Options Outstanding	3,780,244	4,096,818
Options, Grants in Period, Gross	104,585	237,700
Stock option exercises during the year, Shares	(1,696,255)	(143,391)
Options, Forfeitures and Expirations in Period	(231,842)	(410,883)
Closing Balance Stock Options Outstanding	1,956,732	3,780,244
Begining Balance Weighted Average Exercise Price	$ 3.95	$ 3.94
Options, Grants in Period, Weighted Average Exercise Price	4.48	3.24
Options, Exercises in Period, Weighted Average Exercise Price	3.5	2.48
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	4.96	3.93
Closing Balance Weighted Average Exercise Price	$ 4.25	$ 3.95
Begining Balance Restricted Stock Units Outstanding	1,796,927	1,072,653
Restricted stock units, Grants in Period	639,126	1,298,371
Retricted Stock Units, Vested in Period	(845,326)	(488,570)
Restricted Stock Units, cancelled/ forfeited	(356,965)	(85,527)
Closing Balance Restricted Stock Units Outstanding	1,233,762	1,796,927
Begining Balance Grant Date Fair Value Of Restricted Stock Units	$ 2.69	$ 3.15
Granted, Restricted Stock Units Grant Date Fair Value	4.31	2.49
Vested in period, Restricted Stock Unit, Fair Value	2.88	3.08
Forfeited in Period, Restricted Stock Unit Grant Date Fair Value	2.84	3.05
Closing Balance Grant Date Fair Value Of Restricted Stock Units	$ 3.36	$ 2.69
Market Condition Restricted Stock Unit [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Begining Balance Restricted Stock Units Outstanding	164,127	182,150
Restricted stock units, Grants in Period	156,944	0
Retricted Stock Units, Vested in Period	(69,667)	0
Restricted Stock Units, cancelled/ forfeited	(134,460)	(18,023)
Closing Balance Restricted Stock Units Outstanding	116,944	164,127
Begining Balance Grant Date Fair Value Of Restricted Stock Units	$ 4.81	$ 4.81
Granted, Restricted Stock Units Grant Date Fair Value	4.19	0
Vested in period, Restricted Stock Unit, Fair Value	4.81	0
Forfeited in Period, Restricted Stock Unit Grant Date Fair Value	4.63	4.81
Closing Balance Grant Date Fair Value Of Restricted Stock Units	$ 4.19	$ 4.81

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average grant-date fair value of options vested.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Number of share options (or share units) exercised during the current period.

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