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CWP and Workers Comp (Tables)
 12 Months Ended
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
 
 
 
 
Other
 
 
Pension
 
Postretirement
 
 
Benefits
 
Benefits
Prior service credit recognition
 
$
(590
)
 
$
(2,405
)
Actuarial loss recognition
 
$
9,403

 
$
23,112
Schedule of Assumptions Used [Table Text Block]

The weighted-average assumptions used to determine benefit obligations are as follows:
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
For the Year Ended
 
For the Year Ended
 
 
December 31,
 
December 31,
 
 
2016
 
2015
 
2016
 
2015
Discount rate
 
4.31
%
 
4.50
%
 
4.22
%
 
4.50
%
Rate of compensation increase
 
3.90
%
 
3.80
%
 
—

 
—


The discount rates are determined using a Company-specific yield curve model (above-mean) developed with the assistance of an external actuary. The Company-specific yield curve models (above-mean) use a subset of the expanded bond universe to determine the Company-specific discount rate. Bonds used in the yield curve are rated AA by Moody's or Standard & Poor's as of the measurement date. The yield curve models parallel the plans' projected cash flows, and the underlying cash flows of the bonds included in the models exceed the cash flows needed to satisfy the Company plans.

The weighted-average assumptions used to determine net periodic benefit costs are as follows:
 
 
Pension Benefits at
 
Other Postretirement Benefits at
 
 
December 31,
 
December 31,
 
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Discount rate
 
4.52
%
 
4.07
%
 
4.87
%
 
4.50
%
 
4.03
%
 
4.88
%
Expected long-term return on plan assets
 
7.25
%
 
7.75
%
 
7.75
%
 
—

 
—

 
—

Rate of compensation increase
 
3.80
%
 
3.80
%
 
4.21
%
 
—

 
—

 
—
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]


Schedule of Expected Benefit Payments [Table Text Block]
The following benefit payments, reflecting expected future service, are expected to be paid:
Workers Comp and CWP [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The components of the net periodic cost are as follows:
 
 
CWP
 
Workers’ Compensation
 
For the Years Ended
 
For the Years Ended
 
December 31,
 
December 31,
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Service cost
$
4,327

 
$
6,491

 
$
5,674

 
$
7,618

 
$
9,389

 
$
9,781

Interest cost
4,283

 
5,116

 
5,537

 
2,550

 
3,195

 
3,577

Recognized net actuarial gain
(4,948
)
 
(5,576
)
 
(6,196
)
 
(403
)
 
(31
)
 
(382
)
State administrative fees and insurance bond premiums
—

 
—

 
—

 
3,265

 
3,581

 
3,352

Curtailment gain
(1,307
)
 
—

 
—

 
—

 
—

 
—

Settlement gain
—

 
—

 
—

 
—

 
—

 
—

Net periodic cost
$
2,355

 
$
6,031

 
$
5,015

 
$
13,030

 
$
16,134

 
$
16,328
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]




The following are amounts included in accumulated other comprehensive income that are expected to be recognized in 2017 net periodic benefit costs:
 
 
 
 
Workers'
 
 
CWP
 
Compensation
 
 
Benefits
 
Benefits
Actuarial gain recognition
 
$
(7,631
)
 
$
(610
)
Schedule of Assumptions Used [Table Text Block]
Assumptions:
The weighted-average discount rates used to determine benefit obligations and net periodic cost (benefit) are as follows:
 
 
CWP
 
Workers' Compensation
 
 
For the Years Ended
 
For the Years Ended
 
 
December 31,
 
December 31,
 
 
2016

 
2015

 
2014

 
2016

 
2015

 
2014

Benefit obligations
 
4.40
%
 
4.60
%
 
4.21
%
 
4.05
%
 
4.26
%
 
3.84
%
Net periodic cost
 
4.60
%
 
4.21
%
 
4.75
%
 
4.26
%
 
3.84
%
 
4.57
%
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

Schedule of Expected Benefit Payments [Table Text Block]
The following benefit payments, which reflect expected future claims as appropriate, are expected to be paid:
 
 
 
 
Workers' Compensation
 
 
CWP
 
Total
 
Actuarial
 
Other
 
 
Benefits
 
Benefits
 
Benefits
 
Benefits
2017
 
$
10,763

 
$
15,897

 
$
12,416

 
$
3,481

2018
 
$
8,417

 
$
15,193

 
$
11,625

 
$
3,568

2019
 
$
7,606

 
$
15,061

 
$
11,404

 
$
3,657

2020
 
$
7,137

 
$
15,044

 
$
11,295

 
$
3,749

2021
 
$
6,963

 
$
15,056

 
$
11,214

 
$
3,842

Year 2022-2026
 
$
35,714

 
$
76,577

 
$
55,876

 
$
20,701