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Note G - Pension and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
   
Pension Plan
    
Postretirement Plan
  
   
2015
    
2014
    
2015
    
2014
  
Accumulated benefit obligation at end of year
   $ 63,830     $ 65,454     $ 22,430     $ 22,813  
Change in projected benefit obligation:
                                
Benefit obligation at beginning of year
   $ 80,069     $ 70,635     $ 22,813     $ 19,794  
Service cost
     3,064       2,904       1,194       907  
Interest cost
     2,640       2,895       790       845  
Settlement
     1,431       —       —       —  
Benefits paid
     (10,069
)
     (3,584
)
     (1,094
)
     (1,736
)
Effect of foreign exchange
     —       —       (94
)
     (49
)
Actuarial loss (gain)
     465       7,219       (1,179 )     3,052  
Benefit obligation at end of year
   $ 77,600     $ 80,069     $ 22,430     $ 22,813  
Change in plan assets:
                                
Plan assets at beginning of year
   $ 75,573     $ 70,889     $ —     $ —  
Actual return on plan assets
     (1,213 )     5,768       —       —  
Employer contributions
     4,000       2,500       1,094       1,736  
Benefits paid
     (10,069
)
     (3,584
)
     (1,094
)
     (1,736
)
Plan assets at end of year
     68,291       75,573       —       —  
Funded status at end of year
   $ (9,309
)
   $ (4,496
)
   $ (22,430
)
   $ (22,813
)
                                 
Amounts recognized in the Consolidated Balance Sheets consist of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
$
—
 
   $ —     $ (1,646
)
   $ (1,516
)
Noncurrent liabilities
 
 
(9,309
)
     (4,496 )     (20,784
)
     (21,297
)
Total liabilities
 
$
(9,309
)
   $ (4,496 )   $ (22,430
)
   $ (22,813
)
                                 
Amounts recognized in accumulated other comprehensive loss consist of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss (gain)
   $ 29,992     $ 28,836     $ (8,082
)
   $ (7,601
)
Deferred tax (benefit) expense
     (11,590
)
     (11,162
)
     3,038       2,915  
After tax actuarial loss (gain)
   $ 18,402     $ 17,674     $ (5,044
)
   $ (4,686
)
Schedule of Costs of Retirement Plans [Table Text Block]
   
2015
    
2014
    
2013
  
Pension Plan
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
   $ 3,064     $ 2,904     $ 3,144  
Interest cost
     2,640       2,895       2,851  
Expected return on plan assets
     (4,060
)
     (4,755
)
     (5,080
)
Recognized actuarial loss
     2,230       1,664       2,080  
Settlement loss
     3,783       —       4,169  
Net periodic benefit cost
   $ 7,657     $ 2,708     $ 7,164  
Other changes in pension plan assets and benefit obligations recognized in other comprehensive loss:
 
 
 
 
 
 
 
 
 
 
 
 
Net loss (gain)
   $ 1,156     $ 4,541     $ (10,734
)
Total expense (income) recognized in net periodic benefit cost and other comprehensive income
   $ 8,813     $ 7,249     $ (3,570
)
Postretirement Plan
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
   $ 1,194     $ 907     $ 1,153  
Interest cost
     790       845       724  
Recognized actuarial gain
     (649
)
     (1,181
)
     (723
)
Net periodic benefit cost
   $ 1,335     $ 571     $ 1,154  
Other changes in post retirement plan assets and benefit obligations recognized in other comprehensive loss:
 
 
 
 
 
 
 
 
 
 
 
 
Net loss (gain)
   $ (529 )   $ 4,233     $ (3,717
)
Total expense (income) recognized in net periodic benefit cost and other comprehensive income
   $ 806     $ 4,804     $ (2,563
)
Schedule of Assumptions Used [Table Text Block]
   
Pension
Benefits
    
Postretirement
Benefits
  
   
2015
    
2014
    
2015
    
2014
  
Weighted-average assumptions used to determine benefit obligations at December 31:
                                
Discount rate
     3.70
%
     3.45
%
     3.90
%
     3.60
%
Rate of compensation increase
     3.50
%
     3.50
%
     —       —  
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31:
                                
Discount rate
     3.67
%
     4.30
%
     3.60
%
     4.50
%
Expected long-term rate of return on plan assets
     6.00
%
     7.00
%
     —       —  
Rate of compensation increase
     3.50
%
     3.50
%
     —       —  
Schedule of Allocation of Plan Assets [Table Text Block]
2015
   $    
%
  
Level 1
                
Equity
   $ 16,908       25
%
Fixed Income
     1,468       2
%
Mutual Funds
     3,476       5
%
Money Fund and Cash
     1,011       1
%
Total Level 1
     22,863       33
%
Level 2
                
Fixed Income
     41,984       62
%
Money Fund
     3,428       5
%
Total Level 2
     45,412       67
%
Level 3
                
Total Level 3
     —       —  
Total fair value of Plan assets
   $ 68,275       100
%
2014
   $    
%
  
Level 1
                
Equity
   $ 17,819       23
%
Fixed Income
     2,169       3
%
Mutual Funds
     3,598       5
%
Money Fund and Cash
     1,901       3
%
Total Level 1
     25,487       34
%
Level 2
                
Fixed Income
     47,716       63
%
Money Fund
     2,362       3
%
Total Level 2
     50,078       66
%
Level 3
                
Total Level 3
     —       —  
Total fair value of Plan assets
   $ 75,565       100
%
Schedule of Expected Benefit Payments [Table Text Block]
   
2016
    
2017
    
2018
    
2019
    
2020
    
Thereafter
  
Pension
   $ 5,524     $ 7,498     $ 7,544     $ 6,055     $ 7,205     $ 29,274  
Postretirement
     1,678       1,677       1,651       1,656       1,666       8,757