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Stock-Based Compensation - Summary of PSU Activity (Details) - PSUs
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of Share Units  
Share Units, Outstanding as of December 31, 2018 | shares 766
Share Units, Granted | shares 212
Share Units, Vested and delivered | shares 0
Share Units, Forfeited | shares (25)
Share Units, Outstanding as of December 31, 2019 | shares 953
Weighted- Average Grant Date Fair Value  
Weighted- Average Grant Date Fair Value, Outstanding as of December 31, 2018 | $ / shares $ 27.37
Weighted- Average Grant Date Fair Value, Granted | $ / shares 23.99
Weighted- Average Grant Date Fair Value, Vested and delivered | $ / shares 0
Weighted- Average Grant Date Fair Value, Forfeited | $ / shares 26.27
Weighted- Average Grant Date Fair Value, Outstanding as of December 31, 2019 | $ / shares $ 26.60