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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Shareholders' Equity [Abstract]
Adjustment to retirement benefit liability, taxes	$ 40	$ 108	$ 161
Adjustment to post-retirement healthcare benefit liability, taxes	290	74	417
Reclassification of unrealized loss on interest rate swap, tax			$ 693

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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