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Stock-Based Compensation - Summary of PSU Activity (Details) - PSUs
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Share Units  
Share Units, Outstanding as of December 31,2020 | shares 730
Share Units, Granted | shares 0
Share Units, Vested and delivered | shares (588)
Share Units, Forfeited | shares 0
Share Units, Outstanding as of June 30, 2021 | shares 142
Weighted- Average Grant Date Fair Value  
Weighted- Average Grant Date Fair Value, Outstanding as of December 31, 2020 | $ / shares $ 9.28
Weighted-Average Grant Date Fair Value, Granted | $ / shares 0
Weighted-Average Grant Date Fair Value, Vested and delivered | $ / shares 5.74
Weighted- Average Grant Date Fair Value, Forfeited | $ / shares 0
Weighted- Average Grant Date Fair Value, Outstanding as of June 30, 2021 | $ / shares $ 23.98