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

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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Capital Stock and Equity Compensation (Additional Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, measurement period (years)			3 years
Expected dividend yield (percent)			0.00%
Compensation expense	$ 1,600,000	$ 1,500,000	$ 4,300,000	$ 3,500,000
Performance-Based Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)			0.00%
Performance-Based Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)			200.00%
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,500,000	1,500,000	$ 4,600,000	4,400,000
Conversion ratio			1
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0	$ 0	$ 1,000,000.0	$ 1,100,000
Conversion ratio			1
Vesting period			13 months