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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Loss [Table Text Block] | The following table details the changes in accumulated other comprehensive loss for the three and six months ended June 30, 2019 and 2018:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2019 |  | 2018 |  | 2019 |  | 2018
| (thousands)
Beginning balance, net of taxes | $ | (47,684 | ) |  | $ | (76,089 | ) |  | $ | (47,652 | ) |  | $ | (76,702 | )
Net actuarial gain, before taxes | — |  |  | 13,340 |  |  | — |  |  | 13,340 |
Amortization of actuarial (gain) loss, before taxes (a) | (44 | ) |  | 356 |  |  | (87 | ) |  | 1,177 |
Effect of settlements, before taxes (a) | — |  |  | 12,003 |  |  | — |  |  | 12,003 |
Income taxes | 11 |  |  | (6,517 | ) |  | 22 |  |  | (6,725 | )
Ending balance, net of taxes | $ | (47,717 | ) |  | $ | (56,907 | ) |  | $ | (47,717 | ) |  | $ | (56,907 | )
___________________________________ (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 9, Retirement and Benefit Plans.

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