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Stock-Based Compensation - Schedule of Restricted Stock Unit Activity and Weighted Average Grant Date Fair Value (Details) - Restricted Stock Units
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Shares  
Non-vested at January 1, 2017 (in shares) | shares 150,682
Granted (in shares) | shares 152,207
Forfeited (in shares) | shares (20,844)
Vested (in shares) | shares (21,101)
Unearned performance-based awards (in shares) | shares (604)
Non-vested at September 30, 2017 (in shares) | shares 260,340
Weighted-Average Grant Date Fair Value  
Non-vested at January 1, 2017 (in dollars per share) | $ / shares $ 33.39
Granted (in dollars per share) | $ / shares 35.42
Forfeited (in dollars per share) | $ / shares 33.84
Vested (in dollars per share) | $ / shares 33.65
Unearned performance-based awards (in dollars per share) | $ / shares 52.83
Non-vested at September 30, 2017 (in dollars per share) | $ / shares $ 34.60