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Stock-Based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Stock-Based Compensation [Abstract]  
Share-based Compensation Options Activity
The following table summarizes the activity of common stock options for the period from December 31, 2018 through the year ended December 31, 2021:
Number of OptionsWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (in years)Aggregate Intrinsic Value
(in thousands)
Outstanding at December 31, 20182,941,154 $10.79 
Exercised(492,498)$8.07 
Forfeited(74,299)$8.16 
Outstanding at December 31, 20192,374,357 $11.44 
Exercised(43,250)$8.64 
Forfeited(157,776)$9.23 
Outstanding at December 31, 20202,173,331 $9.84 (1)
Exercised(208,500)$3.56 
Forfeited(39,996)$3.53 
Expired(40,484)$14.52 
Outstanding at December 31, 20211,884,351 $6.99 (2)4.97$7,714 
Exercisable at December 31, 20211,547,535 $7.75 5.03$5,417 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The Company used a Monte Carlo simulation to estimate the fair value of the portion of the awards subject to the TSR goal, with the following assumptions:
Expected dividend yield— %
Risk-free interest rate1.56 %
Expected volatility28.57 %
Expected term (in years)2.95
Grant date fair value$24.11 
The Company used a Monte Carlo simulation to estimate the fair value of the awards, with the following assumptions:
Expected dividend yield— %
Risk-free interest rate0.20 %
Expected volatility41.70 %
Expected term (in years)2.95
Grant date fair value$13.21 
Schedule of Nonvested Restricted Stock Awards, Restricted Stock Units and Performance Stock Unit Activity
The following table summarizes the activity of restricted stock awards, restricted stock units and performance stock units for the period from December 31, 2018 through the year ended December 31, 2021:
Restricted Stock AwardsRestricted Stock UnitsPerformance Stock Units
Number of
Shares		Weighted Average Grant Date Fair Value (per share)Number of
Units		Weighted Average Grant Date Fair Value (per share)Number of
Units		Weighted Average Grant Date Fair Value (per share)
Nonvested as of December 31, 20181,770,660 $8.39 998,786 $16.83 — $— 
Granted— $— 1,245,628 $15.42 550,676 $15.41 
Vested(97,140)$12.32 (541,383)$16.68 — $— 
Forfeited(127,390)$8.04 (74,595)$16.09 — $— 
Nonvested as of December 31, 20191,546,130 $8.17 1,628,436 $15.83 550,676 $15.41 
Granted— $— 1,158,605 $16.60 456,311 $20.29 
Vested(29,760)$12.32 (816,866)$16.17 — $— 
Forfeited(619,355)$8.04 (129,036)$16.28 (41,251)$15.95 
Nonvested as of December 31, 2020897,015 $13.80 (1)1,841,139 $16.14 965,736 $17.69 
Granted— $— 1,697,623 $15.39 211,985 $13.21 
Vested— $— (773,619)$16.00 — $— 
Forfeited(263,291)$15.31 (1)(257,722)$16.03 (60,166)$17.11 
Nonvested as of December 31, 2021633,724 $15.84 (1)2,507,421 $15.68 1,117,555 $16.91