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Stock-Based Compensation - Restricted Stock Units Activity (Details) - RSUs and PSUs
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Number of Shares  
Unvested, beginning balance (shares) | shares 496,000
Granted (shares) | shares 307,000
Vested (shares) | shares (139,000)
Forfeited (shares) | shares (46,000)
Unvested, ending balance (shares) | shares 618,000
Weighted- Average Grant Date Fair Value per Share  
Unvested, beginning balance (usd per share) | $ / shares $ 13.34
Granted (usd per share) | $ / shares 25.64
Vested (usd per share) | $ / shares 12.81
Forfeited (usd per share) | $ / shares 16.17
Unvested, ending balance (usd per share) | $ / shares $ 19.36