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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in accumulated other comprehensive loss are as follows:
|  | Changes in Accumulated Other Comprehensive Loss
|  | Year Ended December 31
|  | 2015 |  | 2014 |  | 2013
|  | (thousands)
Beginning Balance, net of taxes |  | $ | (101,498 | ) |  | $ | (55,249 | ) |  | $ | (121,229 | )
Net actuarial gain (loss), current-period changes, before taxes |  | 8,406 |  |  | (75,016 | ) |  | 97,171 |
Amortization of actuarial (gain) loss, amounts reclassified from accumulated other comprehensive loss, before taxes (a) |  | 4,884 |  |  | (23 | ) |  | 9,202 |
Effect of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes (a) |  | 501 |  |  | — |  |  | — |
Amortization of prior service costs and other, amounts reclassified from accumulated other comprehensive loss, before taxes (a) |  | — |  |  | — |  |  | 304 |
Income taxes |  | (5,308 | ) |  | 28,790 |  |  | (40,697 | )
Ending Balance, net of taxes |  | $ | (93,015 | ) |  | $ | (101,498 | ) |  | $ | (55,249 | )
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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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