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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2018 and 2017:
| Three Months Ended March 31
| 2018 |  | 2017
| (thousands)
Beginning balance, net of taxes | $ | (76,702 | ) |  | $ | (83,012 | )
Amortization of actuarial loss, before taxes (a) | 821 |  |  | 395 |
Income taxes | (208 | ) |  | (152 | )
Ending balance, net of taxes | $ | (76,089 | ) |  | $ | (82,769 | )
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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 7, Retirement and Benefit Plans.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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