Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Income tax on unrecognized actuarial loss and prior service costs	$ 290	$ 882
Income tax on cash flow hedge activity	48	252
Treasury shares purchased	76
Stock option exercises and other shares issued to employees and directors, shares	137	151
Dividends declared, per common share	$ 0.33	$ 0.27
Additional Paid-in Capital
Stock option exercises and other shares issued to employees and directors, shares	137	151
Treasury Shares
Treasury shares purchased	76
Stock option exercises and other shares issued to employees and directors, shares	137	151
Accumulated Other Comprehensive Loss
Income tax on unrecognized actuarial loss and prior service costs	290	882
Income tax on cash flow hedge activity	$ 48	$ 252
Retained Earnings
Dividends declared, per common share	$ 0.33	$ 0.27