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Share-Based Compensation - Summary of Nonvested Restricted Stock Unit Activity (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Restricted Stock Units Activity [Abstract]  
Number of Shares, Nonvested beginning balance | shares 1,014
Number of Shares, Granted | shares 109
Number of Shares, Vested | shares (159)
Number of Shares, Forfeited | shares (7)
Number of Shares, Nonvested ending balance | shares 957
Weighted Average Grant Date Fair Value, Nonvested beginning balance | $ / shares $ 14.88
Weighted Average Grant Date Fair Value, Granted | $ / shares 27.36
Weighted Average Grant Date Fair Value, Vested | $ / shares 12.52
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 13.37
Weighted Average Grant Date Fair Value, Nonvested ending balance | $ / shares $ 16.71