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Share-Based Compensation - RSU and PSU Activity (Details) - Restricted stock unit and performance stock unit
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Shares  
Beginning balance, shares | shares 0
Granted, shares | shares 336
Vested, shares | shares 0
Forfeited, shares | shares (2)
Ending balance, shares | shares 334
Weighted Average Grant Date Fair Value per Share  
Beginning balance (dollar per share) | $ / shares $ 0.00
Granted (dollar per share) | $ / shares 221.29
Vested (dollar per share) | $ / shares 0.00
Forfeited (dollar per share) | $ / shares 229.75
Ending balance (dollar per share) | $ / shares $ 221.25