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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Stockholders' Equity Note [Abstract] |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The following table details the changes in accumulated other comprehensive loss for the three and six months ended June 30, 2018 and 2017:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (thousands)
Beginning balance, net of taxes | $ | (76,089 | ) |  | $ | (82,769 | ) |  | $ | (76,702 | ) |  | $ | (83,012 | )
Net actuarial gain, before taxes | 13,340 |  |  | — |  |  | 13,340 |  |  | — |
Amortization of actuarial loss, before taxes (a) | 356 |  |  | 410 |  |  | 1,177 |  |  | 805 |
Effect of settlements, before taxes (a) | 12,003 |  |  | — |  |  | 12,003 |  |  | — |
Income taxes | (6,517 | ) |  | (158 | ) |  | (6,725 | ) |  | (310 | )
Ending balance, net of taxes | $ | (56,907 | ) |  | $ | (82,517 | ) |  | $ | (56,907 | ) |  | $ | (82,517 | )
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(a) | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 8, Retirement and Benefit Plans.

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