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Stock-Based Compensation - Performance Restricted Stock Units (Details) - Performance Restricted Stock Units (PRSUs)	12 Months Ended
	Dec. 31, 2020 USD ($) award_vesting_period shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of award achievement periods | award_vesting_period	3
Award achievement period	1 year
Weighted volatility rate	50.00%
Fair value of performance units granted	$ 3,000,000.0	$ 3,700,000	$ 2,000,000.0
Granted (in shares) | shares	676,615	446,858	275,550
Award vesting period	3 years	3 years	3 years
Stock-based compensation expense	$ 2,600,000	$ 2,000,000.0	$ 1,200,000
Fair value of awards vested	1,500,000	$ 0	$ 0
Unamortized stock compensation expense	$ 3,400,000
Compensation cost not yet recognized, period for recognition	1 year 9 months
25th Percentile (Threshold Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award achievement period	1 year	1 year	1 year
Award vesting percentage	50.00%
50th Percentile (Target Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award achievement period	1 year	1 year	1 year
Award vesting percentage	100.00%
75th Percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award achievement period	1 year	1 year	1 year
Award vesting percentage	150.00%
90th Percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	200.00%

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

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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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