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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) Net of Tax (Tables) | 6 Months Ended
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Jun. 30, 2018
Statement of Comprehensive Income [Abstract] |
Comprehensive Income (Loss) [Table Text Block] | ther comprehensive income (loss) components, net of income tax, are shown in the following table for the three-month and six-month periods ended June 30, 2018 and 2017:
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Change in unrealized losses on debt securities |  | Total
Beginning balance at April 1, 2018 |  | $ | (26,701 | ) |  | $ | (25,940 | ) |  | $ | (52,641 | )
| Other comprehensive loss before reclassifications |  | — |  |  | (2,368 | ) |  | (2,368 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Activity for the period |  | — |  |  | (2,368 | ) |  | (2,368 | )
Ending balance at June 30, 2018 |  | $ | (26,701 | ) |  | $ | (28,308 | ) |  | $ | (55,009 | )
Beginning balance at April 1, 2017 |  | $ | (14,740 | ) |  | $ | (1,983 | ) |  | $ | (16,723 | )
| Other comprehensive income before reclassifications |  | — |  |  | 3,011 |  |  | 3,011 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 3,011 |  |  | 3,011 |
Ending balance at June 30, 2017 |  | $ | (14,740 | ) |  | $ | 1,028 |  |  | $ | (13,712 | )
(in thousands) |  | Changes in pension plan assets and benefit obligations |  | Change in unrealized losses on debt securities |  | Total
Beginning balance at January 1, 2018 |  | $ | (23,526 | ) |  | $ | (2,928 | ) |  | $ | (26,454 | )
| Other comprehensive loss before reclassifications |  | — |  |  | (25,778 | ) |  | (25,778 | )
| Reclassification of disproportionate income tax effects |  | (3,175 | ) |  | (631 | ) |  | (3,806 | )
| Cumulative effect of change in accounting principle for marketable equity securities, net of tax |  | — |  |  | (995 | ) |  | (995 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | 2,024 |  |  | 2,024 |
Activity for the period |  | (3,175 | ) |  | (25,380 | ) |  | (28,555 | )
Ending balance at June 30, 2018 |  | $ | (26,701 | ) |  | $ | (28,308 | ) |  | $ | (55,009 | )
Beginning balance at January 1, 2017 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
| Other comprehensive income before reclassifications |  | — |  |  | 4,033 |  |  | 4,033 |
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive income |  | — |  |  | 4,033 |  |  | 4,033 |
Ending balance at June 30, 2017 |  | $ | (14,740 | ) |  | $ | 1,028 |  |  | $ | (13,712 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
Name: | us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration