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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, 2015
Statement of Comprehensive Income [Abstract] |
Comprehensive Income (Loss) [Table Text Block] | Other comprehensive income components, net of tax, are shown in the following table for the three-month and six-month periods ended June 30, 2015 and 2014:
Three months ended June 30, (in thousands) |  | Changes in pension plan assets and benefit obligations |  | Unrealized gains and losses on available for sale securities |  | Total
Beginning balance at March 31, 2015 |  | $ | (14,865 | ) |  | $ | 9,116 |  |  | $ | (5,749 | )
| Other comprehensive loss before reclassifications |  | — |  |  | (8,231 | ) |  | (8,231 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive loss |  | — |  |  | (8,231 | ) |  | (8,231 | )
Ending balance at June 30, 2015 |  | $ | (14,865 | ) |  | $ | 885 |  |  | $ | (13,980 | )
Beginning balance at March 31, 2014 |  | $ | (5,598 | ) |  | $ | (18,880 | ) |  | $ | (24,478 | )
| Other comprehensive income before reclassifications |  | — |  |  | 13,092 |  |  | 13,092 |
| Amounts reclassified from accumulated other comprehensive income |  | — |  |  | (13 | ) |  | (13 | )
Net current period other comprehensive income |  | — |  |  | 13,079 |  |  | 13,079 |
Ending balance at June 30, 2014 |  | $ | (5,598 | ) |  | $ | (5,801 | ) |  | $ | (11,399 | )
Six months ended June 30, (in thousands) |  | Changes in pension plan assets and benefit obligations |  | Unrealized gains and losses on available for sale securities |  | Total
Beginning balance at December 31, 2014 |  | $ | (14,865 | ) |  | $ | 1,257 |  |  | $ | (13,608 | )
| Other comprehensive loss before reclassifications |  | — |  |  | (372 | ) |  | (372 | )
| Amounts reclassified from accumulated other comprehensive loss |  | — |  |  | — |  |  | — |
Net current period other comprehensive loss |  | — |  |  | (372 | ) |  | (372 | )
Ending balance at June 30, 2015 |  | $ | (14,865 | ) |  | $ | 885 |  |  | $ | (13,980 | )
Beginning balance at December 31, 2013 |  | $ | (5,598 | ) |  | $ | (29,821 | ) |  | $ | (35,419 | )
| Other comprehensive income before reclassifications |  | — |  |  | 24,033 |  |  | 24,033 |
| Amounts reclassified from accumulated other comprehensive income |  | — |  |  | (13 | ) |  | (13 | )
Net current period other comprehensive income |  | — |  |  | 24,020 |  |  | 24,020 |
Ending balance at June 30, 2014 |  | $ | (5,598 | ) |  | $ | (5,801 | ) |  | $ | (11,399 | )

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&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