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Employee Benefit Plans and Stock-based Compensation - RSU (Details) - Restricted Stock Awards [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares [Roll Forward]
Non-vested, beginning of period (in shares)	1,022	939	633
Granted (in shares)	274	443	554
Vested (in shares)	(407)	(347)	(228)
Forfeited (in shares)	(14)	(13)	(20)
Non-vested, end of period (in shares)	875	1,022	939
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested, beginning of period (in dollars per share)	$ 5.27	$ 5.02	$ 6.85
Granted (in dollars per share)	9.07	5.94	3.60
Vested (in dollars per share)	5.70	5.44	6.46
Forfeited (in dollars per share)	5.38	5.54	7.16
Non-vested, end of period (in dollars per share)	$ 6.26	$ 5.27	$ 5.02
Total fair value of restricted stock awards vested	$ 3.8	$ 1.9	$ 1.5
Unrecognized compensation expense related to restricted stock awards	$ 4.9
Weighted average remaining contractual terms	1 year 7 months 6 days

X

- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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