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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2014
Stock-Based Compensation [Abstract]  
Summary of Restricted Stock Activity

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

  Three Months Ended
  March 31, 2014
  Shares       Fair Value
Balance at December 31, 2013 58,649     $       37.45
Granted 16,399     $ 61.45
Vested        (23,391 )   $ 34.94
Balance at March 31, 2014 51,657     $ 46.20
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, 2014:

          Weighted-   Average   Aggregate
          Average   Remaining   Intrinsic
          Exercise   Contractual   Value
        Shares       Price       Term Years       (In thousands)
Outstanding at December 31, 2013          343,445     $       32.01   7.33   $       12,137
Granted   37,213     $ 61.64          
Exercised   (7,261 )   $ 35.00          
Outstanding at March 31, 2014   373,397     $ 34.91   7.35   $ 6,219
Exercisable at March 31, 2014   248,415     $ 29.40   6.52   $ 5,506
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, 2014:

        Weighted-Average
  Shares   Grant Date Fair Value
Non-vested at December 31, 2013        177,128         $ 37.11
Granted 37,213     $ 61.64
Vested (89,359 )   $ 35.09
Non-vested at March 31, 2014 124,982     $ 45.85
Schedule of Assumptions used in SARs Granted

Following are the assumptions used to estimate the per-share fair value of SARs granted:

  Three Months Ended March 31,
  2014       2013
Risk-free interest rate 2.38%   1.29%
Expected life 7 yrs.   7 yrs.
Expected volatility        28.11%          28.72%
Expected dividend yield 1.30%   1.71%