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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 and 2016:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (thousands)
Beginning Balance, net of taxes | $ | (82,769 | ) |  | $ | (92,538 | ) |  | $ | (83,012 | ) |  | $ | (93,015 | )
Amortization of actuarial loss, before taxes (a) | 410 |  |  | 478 |  |  | 805 |  |  | 956 |
Effect of settlements, before taxes (a) | — |  |  | — |  |  | — |  |  | 297 |
Income taxes | (158 | ) |  | (184 | ) |  | (310 | ) |  | (482 | )
Ending Balance, net of taxes | $ | (82,517 | ) |  | $ | (92,244 | ) |  | $ | (82,517 | ) |  | $ | (92,244 | )
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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 net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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