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Stock Compensation Plans - Schedule of Restricted Stock Unit Activity and Weighted Average Grant Date Fair Value (Details) - Restricted Stock Units (RSUs)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Shares  
Non-vested at January 1, 2017 (in shares) | shares 257,492
Granted (in shares) | shares 102,458
Forfeited (in shares) | shares (29,692)
Vested (in shares) | shares (18,618)
Unearned performance-based awards (in shares) | shares (640)
Non-vested at December 31, 2017 (in shares) | shares 311,000
Weighted-Average Grant Date Fair Value  
Non-vested at January 1, 2017 (in dollars per share) | $ / shares $ 34.75
Granted (in dollars per share) | $ / shares 60.26
Forfeited (in dollars per share) | $ / shares 39.36
Vested (in dollars per share) | $ / shares 35.03
Unearned performance-based awards (in dollars per share) | $ / shares 51.15
Non-vested at December 31, 2017 (in dollars per share) | $ / shares $ 42.66