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Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Postretirement Benefits - (Details) (Accumulated Defined Benefit Plans Adjustment, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of year	$ 188	$ (123)	$ (87)
Amortization of unrecognized transition obligation	0	5	29
Change in unamortized net actuarial gain (loss)	(481)	475	(86)
Related deferred taxes	168	(169)	21
Balance at end of year	$ (125)	$ 188	$ (123)

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.

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