| **- Summary of Changes in Accumulated Other Comprehensive Loss for Pension Plan Items (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 6 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Accumulated other comprehensive loss beginning balance                                                                                            | $ (8,555)      |           | $ (8,652) |   |
| Other comprehensive income before reclassifications                                                                                               | 1,122          |           | 1,122 |   |
| Total other comprehensive income (loss), net of tax                                                                                               | 1,617          | (220)          | 1,714 | 218 |
| Accumulated other comprehensive loss ending balance                                                                                               | (6,938)        |           | (6,938) |   |
| Defined Benefit Pension Items                                                                                                                     |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Accumulated other comprehensive loss beginning balance                                                                                            | (8,555)        |           | (8,652) |   |
| Other comprehensive income before reclassifications                                                                                               | 2,013          |           | 2,013 |   |
| Total other comprehensive income (loss), net of tax                                                                                               | 2,508          |           | 2,605 |   |
| Accumulated other comprehensive loss ending balance                                                                                               | (6,047)        |           | (6,047) |   |
| Defined Benefit Pension Items | Amortization of loss included in net periodic cost                                                                |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Amounts reclassified from accumulated other comprehensive loss                                                                                    | 101            |           | 198 |   |
| Defined Benefit Pension Items | Settlement cost included in net periodic cost                                                                     |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Amounts reclassified from accumulated other comprehensive loss                                                                                    | 394            |           | 394 |   |
| Unrealized Gains and Losses on Available-for-Sale Securities                                                                                      |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Accumulated other comprehensive loss beginning balance                                                                                            | 0              |           | 0 |   |
| Other comprehensive income before reclassifications                                                                                               | (891)          |           | (891) |   |
| Total other comprehensive income (loss), net of tax                                                                                               | (891)          |           | (891) |   |
| Accumulated other comprehensive loss ending balance                                                                                               | (891)          |           | (891) |   |
| Unrealized Gains and Losses on Available-for-Sale Securities | Amortization of loss included in net periodic cost                                 |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Amounts reclassified from accumulated other comprehensive loss                                                                                    | 0              |           | 0 |   |
| Unrealized Gains and Losses on Available-for-Sale Securities | Settlement cost included in net periodic cost                                      |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                      |           |           |   |   |
| Amounts reclassified from accumulated other comprehensive loss                                                                                    | $ 0            |           | $ 0 |   |

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| - Definition
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
+ References
No definition available.
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| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
+ References
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| - Definition
Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
+ References
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