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Stock-Based Compensation - Cash-Settled Stock Options (Details) - Cash-Settled Stock Option $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares Underlying Options
Granted (in shares) | shares	230
Outstanding at end of period (in shares) | shares	230
Exercisable at end of period (in shares) | shares	230
Weighted Average Exercise Price
Granted (in dollars per share) | $ / shares	$ 25.89
Outstanding at end of period (in dollars per share) | $ / shares	25.89
Exercisable at end of period (in dollars per share) | $ / shares	$ 25.89
Additional disclosures
Weighted Average Remaining Contractual Life	6 months
Weighted Average Remaining Contractual Life, Exercisable at end of period	6 months
Outstanding, Aggregate Intrinsic Value | $	$ 6,572
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 6,572
Stock-based awards - weighted average assumptions used to estimate fair value of options granted
Expected term	6 months
Expected volatility rate (as a percent)	44.25%
Risk-free interest rate (as a percent)	1.60%

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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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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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