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Share-Based Payments (Tables)
6 Months Ended
Jun. 30, 2013
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Schedule of Stock Incentive Awards granted to non-employee directors, executive officers and key employees

Award
Shares/Units 
Granted
 
Grant-Date 
Fair Value 
per Award
 
Vesting
Restricted Stock Granted to Nonemployee Directors
16,000
 
$31.03
 
25% per year through April 8, 2017
Restricted Stock Granted to Executive Officers
17,000
 
$31.03
 
25% per year through April 8, 2017
Stock Performance Awards Granted to Executive Officers
50,200
 
$37.51
 
December 31, 2015
Restricted Stock Units Granted to Employees
15,150
 
$25.30
 
100% on April 8, 2017
 
Schedule of compensation expense under stock-based payment programs
 
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
(in thousands)
 
2013
   
2012
   
2013
   
2012
 
Employee Stock Purchase Plan (15% discount)
  $ 42     $ 49     $ 59     $ 88  
Restricted Stock Granted to Directors
    162       138       369       274  
Restricted Stock Granted to Employees
    112       87       204       145  
Restricted Stock Units Granted to Employees
    79       51       154       105  
Stock Performance Awards Granted to Executive Officers
    703       293       1,801       293  
  Totals
  $ 1,098     $ 618     $ 2,587     $ 905