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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Activity

Following is a summary of the activity of the restricted stock:

Nine Months Ended
September 30, 2018
      Shares       Fair Value
Balance at December 31, 2017 78,166 $      50.30
Granted 28,527 59.69
Vested (23,758) 46.83
Balance at September 30, 2018 82,935 $ 54.52
Summary of SARs Activity

Following is a summary of the activity of the Company’s SARs program for the nine-month period ended September 30, 2018:

Weighted- Average Aggregate
Average Remaining Intrinsic
Exercise Contractual Value
      Shares       Price       Term Years       (In thousands)
Outstanding at December 31, 2017 234,236 $      34.97 5.03 $      7,291
Exercised (36,624) 30.31
Outstanding at September 30, 2018 197,612 35.84 3.75 5,787
Exercisable at September 30, 2018 197,612 $ 35.84 3.75 $ 5,787