Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for 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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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 estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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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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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Share-Based Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
Share-Based Compensation (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)	1,616,672		1,616,672
Costs for share-based payment arrangements	$ 2,500,000	$ 4,300,000	$ 10,700,000	$ 14,300,000
Unamortized share-based compensation expense	$ 9,600,000		$ 9,600,000
Weighted average period over which unrecognized compensation cost is expected to be recognized			1 year 8 months 12 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)			75,000	400,000
Weighted-average fair values per share (in dollars per share)			$ 13.93	$ 20.90
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock options granted (in shares)			75,000	135,000
Weighted average grant date fair value (in dollars per share)			$ 3.94	$ 6.84
Weighted-average exercise prices (in dollars per share)			$ 25.70	$ 20.94
Expected life			6 years
Expected volatility (as a percent)			44.91%
Risk-free rate			1.56%
Expected quarterly dividends			$ 0
Unrestricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)			194,177	98,591
Weighted-average fair values per share (in dollars per share)			$ 8.60	$ 15.72