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CWP and Workers Comp (Tables) | 12 Months Ended
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Dec. 31, 2014
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 |  | $ | (704 | ) |  | $ | (58,546 | )
Actuarial loss recognition |  | $ | 27,760 |  |  | $ | 35,705 |
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,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Discount rate |  | 4.07 | % |  | 4.87 | % |  | 3.80 | % |  | 4.88 | %
Rate of compensation increase |  | 3.80 | % |  | 4.23 | % |  | — |  |  | — |
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,
|  | 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
Discount rate |  | 4.87 | % |  | 4.00 | % |  | 4.50 | % |  | 4.88 | % |  | 4.05 | % |  | 4.51 | %
Expected long-term return on plan assets |  | 7.75 | % |  | 7.75 | % |  | 8.00 | % |  | — |  |  | — |  |  | — |
Rate of compensation increase |  | 4.21 | % |  | 3.77 | % |  | 3.82 | % |  | — |  |  | — |  |  | — |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | Assumed discount rates also have a significant effect on the amounts reported for both pension and other benefit costs. A one-quarter percentage point change in assumed discount rate would have the following effect on benefit costs:
|  | 0.25 Percentage |  | 0.25 Percentage
|  | Point Increase |  | Point Decrease
Pension benefit costs (decrease) increase |  | $ | (1,955 | ) |  | $ | 1,914 |
Other postemployment benefits costs (decrease) increase |  | $ | (3,476 | ) |  | $ | 3,663 |
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 (credit) are as follows:
| CWP |  | Workers’ Compensation
| For the Years Ended |  | For the Years Ended
| December 31, |  | December 31,
| 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
Service cost | $ | 5,674 |  |  | $ | 8,168 |  |  | $ | 7,711 |  |  | $ | 9,781 |  |  | $ | 15,943 |  |  | $ | 17,126 |
Interest cost | 5,537 |  |  | 7,031 |  |  | 7,964 |  |  | 3,577 |  |  | 6,401 |  |  | 7,113 |
Amortization of prior service cost | — |  |  | — |  |  | (395 | ) |  | — |  |  | — |  |  | — |
Recognized net actuarial gain | (6,196 | ) |  | (16,384 | ) |  | (19,338 | ) |  | (382 | ) |  | (2,630 | ) |  | (3,944 | )
State administrative fees and insurance bond premiums | — |  |  | — |  |  | — |  |  | 3,352 |  |  | 5,324 |  |  | 6,727 |
Settlement gain | — |  |  | (119,881 | ) |  | — |  |  | — |  |  | (121,838 | ) |  | — |
Net periodic cost (credit) | $ | 5,015 |  |  | $ | (121,066 | ) |  | $ | (4,058 | ) |  | $ | 16,328 |  |  | $ | (96,800 | ) |  | $ | 27,022 |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] | Following are amounts included in accumulated other comprehensive income that are expected to be recognized in 2015 net periodic benefit costs:
|  |  |  | Workers'
|  | CWP |  | Compensation
|  | Benefits |  | Benefits
Actuarial gain recognition |  | $ | (5,576 | ) |  | $ | (30 | )
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,
|  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2014 |  |  | 2013 |  |  | 2012 |
Benefit obligations |  | 4.21 | % |  | 4.75 | % |  | 4.03 | % |  | 3.84 | % |  | 4.57 | % |  | 3.95 | %
Net periodic cost (benefit) |  | 4.75 | % |  | 4.03 | % |  | 4.46 | % |  | 4.57 | % |  | 3.95 | % |  | 4.40 | %
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | Assumed discount rates have a significant effect on the amounts reported for both CWP costs and Workers' Compensation costs. A one-quarter percentage point change in assumed discount rate would have the following effect on benefit costs:
|  | 0.25 Percentage |  | 0.25 Percentage
|  | Point Increase |  | Point Decrease
CWP costs (decrease) increase |  | $ | (134 | ) |  | $ | 138 |
Workers' compensation costs (decrease) increase |  | $ | (95 | ) |  | $ | 102 |
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
2015 |  |  | $ | 9,156 |  |  | $ | 17,101 |  |  | $ | 13,795 |  |  | $ | 3,306 |
2016 |  |  | $ | 7,483 |  |  | $ | 17,027 |  |  | $ | 13,639 |  |  | $ | 3,388 |
2017 |  |  | $ | 6,802 |  |  | $ | 17,123 |  |  | $ | 13,650 |  |  | $ | 3,473 |
2018 |  |  | $ | 6,402 |  |  | $ | 17,287 |  |  | $ | 13,727 |  |  | $ | 3,560 |
2019 |  |  | $ | 6,207 |  |  | $ | 17,443 |  |  | $ | 13,794 |  |  | $ | 3,649 |
Year 2020-2024 |  |  | $ | 29,376 |  |  | $ | 91,222 |  |  | $ | 71,563 |  |  | $ | 19,659 |

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