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Consolidated Statements of Shareholders' Equity (Parentheticals) ([UnfundedPensionObligationMember], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
[UnfundedPensionObligationMember]
Shareholders Equity Parentheticals
Change in net unrealized gains on investments, reflected in other comprehensive income, tax	$ 7,731	$ 6,590	$ 4,872

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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