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CWP and Workers Comp - Net Periodic Costs (Tables)
 3 Months Ended
Mar. 31, 2017
CWP And Workers Comp Net Periodic Cost [Abstract]  
Schedule Of Postemployment Benefits Disclosure [Text Block]
Components of Net Periodic Benefit Cost (Credit) are as follows:
 
CWP
 
Workers' Compensation
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
Service Cost
$
1,129

 
$
1,204

 
$
1,463

 
$
1,904

Interest Cost
1,013

 
1,123

 
592

 
638

Amortization of Actuarial Gain
(1,908
)
 
(1,383
)
 
(153
)
 
(101
)
Administrative Fees
151

 
—

 
138

 
—

State Administrative Fees and Insurance Bond Premiums
—

 
—

 
799

 
731

Curtailment Gain
—

 
(1,307
)
 
—

 
—

Net Periodic Benefit Cost (Credit)
$
385

 
$
(363
)
 
$
2,839

 
$
3,172