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Pension Benefit and Other Postretirement Benefit Plans (Tables)
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6 Months Ended |
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Jun. 30, 2013
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| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
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| Change in benefit obligation [Table Text Block] |
| | | | | (Dollars in thousands) | Pension Benefits | Change in benefit obligation: | June 30, 2013 | | | Benefit obligation at beginning of year | $ | 209,844 |
| Service cost | 2,210 |
| Interest cost | 4,015 |
| Actuarial (gain) loss | 1,658 |
| Benefit payments | (3,642 | ) | Curtailment charge | (22,649 | ) | Special termination benefit | — |
| Benefit obligation at end of the period | $ | 191,436 |
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| Change in plan assets [Table Text Block] |
| | | | | (Dollars in thousands) | Pension Benefits | Change in plan assets: | June 30, 2013 | | | Fair value of plan assets at the beginning of the year | $ | 143,540 |
| Actual return on plan assets | 10,981 |
| Employer contributions | 6,500 |
| Benefit payments | (3,642 | ) | Settlement charge | — |
| Fair value of plan assets at the end of the period | 157,379 |
| Funded status | $ | (34,057 | ) |
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| Amounts recognized in consolidated balance sheet [Table Text Block] |
Amounts recognized in the consolidated balance sheet consist of: | | | | | (Dollars in thousands) | Pension Benefits | | June 30, 2013 | Noncurrent assets | $ | — |
| Current liabilities | (49 | ) | Noncurrent liabilities | (34,008 | ) | Net amount recognized at end of period | $ | (34,057 | ) |
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| Schedule of net periodic benefit cost not yet recognized [Table Text Block] |
| | | | | (Dollars in thousands) | Pension Benefits | | June 30, 2013 | Net actuarial loss | $ | 58,860 |
| Prior service cost | — |
| Net amount recognized at end of period | $ | 58,860 |
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| Components of net periodic benefit cost [Table Text Block] |
The components of net periodic benefit cost for the periods indicated are:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (Dollars in thousands) | Pension Benefits | | Retirement Health and Life Insurance Benefits | Three Months Ended | | Six Months Ended | | Three Months Ended | | Six Months Ended | Change in benefit obligation: | June 30, 2013 | | June 30, 2012 | | June 30, 2013 | | June 30, 2012 | | June 30, 2013 | | June 30, 2012 | | June 30, 2013 | | June 30, 2012 | Service cost | $ | 956 |
| | $ | 1,108 |
| | $ | 2,210 |
| | $ | 2,297 |
| | $ | 170 |
| | $ | 149 |
| | $ | 341 |
| | $ | 331 |
| Interest cost | 1,954 |
| | 2,124 |
| | 4,015 |
| | 4,242 |
| | 71 |
| | 92 |
| | 141 |
| | 180 |
| Expected return on plan assets | (2,731 | ) | | (2,495 | ) | | (5,447 | ) | | (4,903 | ) | | — |
| | — |
| | — |
| | — |
| Amortization of prior service cost | 31 |
| | 116 |
| | 124 |
| | 232 |
| | (58 | ) | | (113 | ) | | (115 | ) | | (226 | ) | Amortization of net loss | 1,049 |
| | 1,442 |
| | 2,525 |
| | 2,791 |
| | 83 |
| | 66 |
| | 165 |
| | 181 |
| Special termination benefit | — |
| | — |
| | — |
| | — |
| | — |
| | (707 | ) | | — |
| | 1,593 |
| Curtailment charge | 1,537 |
| | — |
| | 1,537 |
| | — |
| | — |
| | — |
| | — |
| | — |
| Net periodic benefit cost | $ | 2,796 |
| | $ | 2,295 |
| | $ | 4,964 |
| | $ | 4,659 |
| | $ | 266 |
| | $ | (513 | ) |
| $ | 532 |
| | $ | 2,059 |
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| Schedule of assumptions used [Table Text Block] |
Weighted-average assumptions used to determine benefit obligations: | | | | | | | Pension Benefits | | April 30, 2013 | December 31, 2012 | | | | Discount rate | 4.00 | % | 4.00 | % | Rate of compensation increase | 4.00 | % | 4.00 | % | Expected long-term rate of return on plan assets | 7.50 | % | 7.50 | % |
Weighted-average assumptions used to determine net benefit cost for the period ended: | | | | | | | Pension Benefits | | April 30, 2013 | December 31, 2012 | | | | Discount rate | 4.00 | % | 4.50 | % | Expected long-term rate of return on plan assets | 7.50 | % | 7.75 | % | Rate of compensation increase | 4.00 | % | 4.00 | % |
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| Schedule of allocation of plan assets [Table Text Block] |
The following table presents the fair value of the net assets by asset category: | | | | | | | | | (Dollars in thousands) | April 30, 2013 | | December 31, 2012 | | | | | Pooled separate accounts | $ | 33,530 |
| | $ | 29,869 |
| Mutual funds | 106,619 |
| | 98,269 |
| Guaranteed deposit account | 16,592 |
| | 15,402 |
| Total investments at fair value | $ | 156,741 |
| | $ | 143,540 |
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The following tables set forth by level, within the fair value hierarchy, the assets carried at fair value: | | | | | | | | | | | | | | | | | | Assets at Fair Value as of April 30, 2013 | (Dollars in thousands) | Level 1 | | Level 2 | | Level 3 | | Total | Pooled separate accounts | $ | — |
| | $ | 33,530 |
| | $ | — |
| | $ | 33,530 |
| Mutual funds | 106,619 |
| | — |
| | — |
| | 106,619 |
| Guaranteed deposit account | — |
| | — |
| | 16,592 |
| | 16,592 |
| Total assets at fair value | $ | 106,619 |
| | $ | 33,530 |
| | $ | 16,592 |
| | $ | 156,741 |
| | | | | | | | | | Assets at Fair Value as of December 31, 2012 | (Dollars in thousands) | Level 1 | | Level 2 | | Level 3 | | Total | Pooled separate accounts | $ | — |
| | $ | 29,869 |
| | $ | — |
| | $ | 29,869 |
| Mutual funds | 98,269 |
| | — |
| | — |
| | 98,269 |
| Guaranteed deposit account | — |
| | — |
| | 15,402 |
| | 15,402 |
| Total assets at fair value | $ | 98,269 |
| | $ | 29,869 |
| | $ | 15,402 |
| | $ | 143,540 |
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| Changes in fair value of Level 3 assets [Table Text Block] |
The table below sets forth a summary of changes in the fair value of the guaranteed deposit account's Level 3 assets for the period ended April 30,2013. | | | | | (Dollars in thousands) | Guaranteed Deposit Account | | | Balance at December 31, 2012 | $ | 15,402 |
| Realized gains (losses) | — |
| Unrealized gains relating to instruments still held at the reporting date | 1,177 |
| Purchases, sales, issuances and settlements (net) | 13 |
| Transfers in and/or out of Level 3 | — |
| Balance at April 30, 2013 | $ | 16,592 |
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| Schedule of future benefit payments [Table Text Block] |
The following pension benefit payments, which reflect expected future employee service, as appropriate, are expected to be paid through the utilization of plan assets for the funded plans and from operating cash flows for the unfunded plans. The benefit payments are based on the same assumptions used to measure our benefit obligation at April 30, 2013. | | | | | | Pension Benefits | | | 2014 | $ | 8,441 |
| 2015 | 8,029 |
| 2016 | 8,209 |
| 2017 | 8,303 |
| 2018 | 8,595 |
| 2019-2023 | 48,629 |
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