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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Loss [Table Text Block] | Changes in accumulated other comprehensive loss are as follows:
|  | Changes in Accumulated Other Comprehensive Loss
|  | Year Ended December 31
|  | 2018 |  | 2017 |  | 2016
|  | (thousands)
Beginning Balance, net of taxes |  | $ | (76,702 | ) |  | $ | (83,012 | ) |  | $ | (93,015 | )
Net actuarial gain, before taxes |  | 14,178 |  |  | 7,067 |  |  | 9,622 |
Amortization of actuarial loss, before taxes (a) |  | 1,497 |  |  | 1,686 |  |  | 2,484 |
Effect of settlements, before taxes (a) |  | 23,255 |  |  | — |  |  | 4,155 |
Income taxes |  | (9,880 | ) |  | (2,443 | ) |  | (6,258 | )
Ending Balance, net of taxes |  | $ | (47,652 | ) |  | $ | (76,702 | ) |  | $ | (83,012 | )
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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 12, 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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