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Payout range minimum.

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Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Targeted Number

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Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Award Types

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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Stock-Based Compensation - Equity-Classified Awards Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) award shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0	28,000	67,000	114,000
Number of restricted stock units granted (in shares)	0	0	0
Stock-based compensation expense \| $	$ 10,632,000	$ 9,362,000	$ 13,730,000
Equity Classified Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 2,700,000
Unrecognized compensation cost, period for recognition (in years)	1 year 7 months 6 days
Number of restricted stock units granted (in shares)	248,000	173,000	66,000
Fair value of restricted stock that vested \| $	$ 1,900,000	$ 3,200,000	$ 2,600,000
Targeted number of non-vested awards (in shares)	242,728
Stock-based compensation expense \| $	$ 6,980,000	$ 5,298,000	$ 3,830,000
Equity Classified Awards \| Independent Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted (in shares)	34,912	34,059	37,166
Equity Classified Awards \| Key Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of award types \| award	3
Vesting period (in years)	3 years
Payout range minimum (as a percent)	0.00%
Payout range maximum (as a percent)	200.00%
Equity Classified Awards \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years	3 years	3 years
Number of restricted stock units granted (in shares)	102,262	71,421	65,824
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 4,700,000
Unrecognized compensation cost, period for recognition (in years)	1 year 7 months 6 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0
Stock-based compensation expense \| $	$ 0	$ 0	$ 0
Number of stock issued during period (in shares)	24,626	12,373