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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2018 and 2017:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (thousands)
Beginning balance, net of taxes | $ | (56,907 | ) |  | $ | (82,517 | ) |  | $ | (76,702 | ) |  | $ | (83,012 | )
Net actuarial gain (loss), before taxes | (3,874 | ) |  | — |  |  | 9,466 |  |  | — |
Amortization of actuarial loss, before taxes (a) | 151 |  |  | 441 |  |  | 1,328 |  |  | 1,245 |
Effect of settlements, before taxes (a) | 11,252 |  |  | — |  |  | 23,255 |  |  | — |
Income taxes | (1,909 | ) |  | (170 | ) |  | (8,634 | ) |  | (479 | )
Ending balance, net of taxes | $ | (51,287 | ) |  | $ | (82,246 | ) |  | $ | (51,287 | ) |  | $ | (82,246 | )
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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 9, Retirement and Benefit Plans.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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