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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Summary of Restricted Stock Award Activity
The following table summarizes restricted stock awards and performance stock awards activity issued under the Plans for the year ended December 31, 2021:
Restricted Stock AwardsPerformance Stock Awards
 Number of
Shares		Weighted
Average
Grant Date
Fair Value		Number of Target
Shares		Weighted
Average
Grant Date
Fair Value
Unvested restricted stock awards, January 1, 20211,345,819 $7.04 548,151 $7.64 
Granted483,900 $13.32 168,324 $12.69 
Vested(653,758)$7.22 — $— 
Forfeited(136,506)$7.73 (194,309)$9.32 
Unvested restricted stock awards, December 31, 20211,039,455 $9.75 522,166 $8.64 
Stock Options and Stock Appreciation Rights Granted and Exercised The following table represents information about stock options and stock appreciation rights exercised in each year.
 Year Ended December 31,
 202120202019
(amounts in thousands)
Total intrinsic value of options exercised$— $1 $130