Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Stock-Based Compensation Stock Awards Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 1,061,000	$ 1,016,000	$ 921,000
2010 Equity Incentive Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	2,439,914	2,490,465
Options granted	0
Options exercised	5,042
Options canceled	(45,509)
Options, Vested and Expected to Vest	2,439,607
Options, Exercisable	2,416,389
Options, Outstanding, Weighted Average Exercise Price	$ 9.57	$ 9.59
Options, Grants in Period, Weighted Average Exercise Price	0.00
Options, Exercises in Period, Weighted Average Exercise Price	4.33
Options, Canceled in Period, Weighted Average Exercise Price	11.35
Options, Vested and Expected to Vest, Weighted Average Exercise Price	9.57
Options, Exercisable, Weighted Average Exercise Price	$ 9.54
Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 9 months 26 days
Options, Exercisable, Intrinsic Value	$ 290,000
Options, Exercises in Period, Intrinsic Value	$ 6,700	$ 173,000	184,000
Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 10 months 2 days
Options, Outstanding, Intrinsic Value	$ 290,300
Nonvested Awards, Compensation Cost Not yet Recognized, Weighted Average Period for Recognition	1 month 28 days
Nonvested Awards, Compensation Cost Not yet Recognized	$ 75,000
2010 Equity Incentive Plan \| Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Vested in Period, Fair Value	$ 645,000		2,433,000
2010 Equity Incentive Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Other Than Options, Unvested	2,665,708	2,073,440
Equity Award Other Than Options, Grants in Period	1,827,626
Equity Award Other Than Options, Vested in Period	(953,156)
Equity Award Other Than Options, Forfeited in Period	(282,202)
Equity Award Other Than Options, Weighted Average Grant Date Fair Value	$ 6.12	$ 9.14
Equity Award Other Than Options, Grants in Period, Weighted Average Grant Date Fair Value	4.55
Equity Award Other Than Options, Vested in Period, Weighted Average Grant Date Fair Value	9.30
Equity Award Other Than Options, Canceled in Period, Weighted Average Grant Date Fair Value	$ 7.33
Equity Instruments Other than Options, Vested in Period, Fair Value	$ 5,404,000	$ 7,813,000	$ 3,192,000
Nonvested Awards, Compensation Cost Not yet Recognized, Weighted Average Period for Recognition	2 years 5 months 16 days
Nonvested Awards, Compensation Cost Not yet Recognized	$ 11,098,000
2010 Equity Incentive Plan \| Market Share Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Other Than Options, Unvested	328,739	233,743
Equity Award Other Than Options, Grants in Period	320,000
Equity Award Other Than Options, Vested in Period	(108,320)
Equity Award Other Than Options, Canceled in Period	(116,684)
Equity Award Other Than Options, Weighted Average Grant Date Fair Value	$ 10.03	$ 10.88
Equity Award Other Than Options, Grants in Period, Weighted Average Grant Date Fair Value	7.19	$ 13.82	$ 4.94
Equity Award Other Than Options, Vested in Period, Weighted Average Grant Date Fair Value	7
Equity Award Other Than Options, Canceled in Period, Weighted Average Grant Date Fair Value	$ 6.58
Equity Instruments Other than Options, Vested in Period, Fair Value		$ 0
Nonvested Awards, Compensation Cost Not yet Recognized, Weighted Average Period for Recognition	1 year 6 months 29 days
Nonvested Awards, Compensation Cost Not yet Recognized	$ 1,283,000
2010 Equity Incentive Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Other Than Options, Grants in Period				43,200
Equity Award Other Than Options, Vested in Period				(10,800)
Equity Award Other Than Options, Forfeited in Period	(10,800)	(10,800)	(10,800)
Equity Award Other Than Options, Vested in Period, Weighted Average Grant Date Fair Value				$ 12.30
Equity Instruments Other than Options, Vested in Period, Fair Value			$ 147,000
2013 Employee Stock Purchase Plan \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Other Than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 4.20	$ 5.82	$ 6.67
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 1,061,000	$ 1,016,000	$ 921,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans	252,623	174,723	138,058