Stock-Based Compensation Schedule of Stock Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Shares Outstanding [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	862,425	1,051,494
Stock options exercised, shares	182,541
Stock options forfeited/canceled, shares	6,528
Exercisable and expected to vest stock options, shares	862,425
Weighted Average Fair Value [Abstract]
Stock options outstanding, weighted average exercise price	$ 10.72	$ 10.15
Stock options exercised, weighted average exercise price	7.31
Stock options forfeited/canceled, weighted average exercise price	15.21
Exercisable and expected to vest stock options, weighted average exercise price	$ 10.72
Weighted Average Contractual Term [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	255 days
Exercisable and expected to vest stock options, weighted average remaining contractual term (years)	255 days
Aggregate Intrinsic Value [Abstract]
Stock options exercised, aggregate intrinsic value	$ 3,274
Stock options outstanding, aggregate intrinsic value	15,362
Exercisable and expected to vest stock options, aggregate intrinsic value	$ 15,362

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Shares Outstanding [Abstract]

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Weighted Average Contractual Term [Abstract]

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Weighted Average Fair Value [Abstract]

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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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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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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Number of fully vested and expected to vest exercisable options that may 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 exercisable or convertible options. 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 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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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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Number of share options (or share units) exercised during the current period.

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