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Stock-Based Compensation - Performance Restricted Stock Units (Details) - PRSUs	12 Months Ended
	Dec. 31, 2019 USD ($) award_vesting_period shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting, period of average award price	30 days
Award vesting, period of average award price, first period	30 days
Award vesting, period of average award price, last period	30 days
Number of award achievement periods | award_vesting_period	3
Weighted volatility rate	50.00%
Fair value of performance units granted	$ 3,700,000	$ 2,000,000.0	$ 2,600,000
Granted (in shares) | shares	446,858	275,550	293,083
Award vesting period	3 years	3 years	3 years
Stock-based compensation expense	$ 2,000,000.0	$ 1,200,000	$ 600,000
Fair value of awards vested	0	$ 0	$ 200,000
Unamortized stock compensation expense	$ 3,000,000.0
Compensation cost not yet recognized, period for recognition	1 year 9 months 25 days
25th Percentile (Threshold Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award achievement period	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
Award vesting percentage	100.00%
75th Percentile (Maximum Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award achievement period	1 year	1 year
Award vesting percentage	150.00%
90th Percentile (the maximum level for the 2018 and 2019 grants)
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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