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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
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:

Three Months Ended
March 31, 2016
      Shares       Fair Value
Balance at December 31, 2015 69,041 $ 51.33
Granted 27,518 $ 49.86
Vested       (25,378 ) $     50.56
Balance at March 31, 2016 71,181 $ 51.03
Summary of SARs Activity

Following is a summary of the activity of the Company’s SARs program for the three-month period ended March 31, 2016:

Weighted- Average Aggregate
Average Remaining Intrinsic
Exercise Contractual Value
      Shares       Price       Term Years       (In thousands)
Outstanding at December 31, 2015 307,323 $ 36.57 5.99 $ 4,577
Exercised (3,352 ) $ 27.80
Outstanding at March 31, 2016      303,971 $     36.66 5.75 $     4,768
Exercisable at March 31, 2016 291,807 $ 35.62 5.66 $ 4,881
Summary of Non-vested SARs Activity

Following is a summary of the activity of the non-vested SARs during the three-month period ended March 31, 2016:

Weighted-Average
      Shares       Grant Date Fair Value
Non-vested at December 31, 2015 52,507 $ 51.17
Vested      (40,343 ) $     48.02
Non-vested at March 31, 2016 12,164 $ 61.64