Stock Compensation - PBRSU's (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Weighted-Average Fair Value Per Share
Weighted-average grant-date fair value (in dollars per share)	$ 19.19	$ 43.22	$ 31.18
Performance Shares
Number of PBRSUs
Outstanding and unvested at the beginning of period (in shares)	0
Granted (in shares)	658,850
Forfeited or expired (in shares)	(18,900)
Vested (in shares)	0
Outstanding and unvested at the ending of period (in shares)	639,950	0
Weighted-Average Fair Value Per Share
Outstanding and unvested at the beginning of period (in dollars per share)	$ 0
Granted (in dollars per share)	10.26
Forfeited or expired (in dollars per share)	22.52
Vested (in dollars per share)	0
Outstanding and unvested at the at the end of the period (in dollars per share)	$ 9.90	$ 0
Stock-based compensation expense	$ 0.8
Unrecognized stock-based compensation expense	$ 5.6
Weighted-average period over which remaining unrecognized compensation cost will be recognized	2 years 3 months 18 days

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

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