Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interest
Beginning Balance at Dec. 31, 2009	$ 406,276	$ 96	$ 175,477	$ (15,554)	$ (25,314)	$ 258,662	$ 12,909
Net income	38,435					37,434	1,001
Other comprehensive income:
Unrecognized actuarial loss and prior service costs (net of income tax of $411 and $993 for 2011 and 2010, respectively)	(1,263)				(1,263)
Cash flow hedge activity (net of income tax of $13 and $147 for 2011 and 2010, respectively)	(230)				(230)
Comprehensive income	36,942
Stock awards, stock option exercises and other shares issued to employees and directors (137 shares and 149 shares for 2011 and 2010, respectively)	2,655		1,259	1,396
Dividends declared ($0.22 and $0.18 per common share for 2011 and 2010, respectively)	(3,316)					(3,316)
Ending Balance at Jun. 30, 2010	442,557	96	176,736	(14,158)	(26,807)	292,780	13,910
Beginning Balance at Dec. 31, 2010	464,559	96	177,875	(14,058)	(28,799)	316,317	13,128
Net income	63,423					62,484	939
Other comprehensive income:
Unrecognized actuarial loss and prior service costs (net of income tax of $411 and $993 for 2011 and 2010, respectively)	(689)				(689)
Cash flow hedge activity (net of income tax of $13 and $147 for 2011 and 2010, respectively)	21				21
Comprehensive income	62,755
Purchase of treasury shares (4 shares)	(140)			(140)
Stock awards, stock option exercises and other shares issued to employees and directors (137 shares and 149 shares for 2011 and 2010, respectively)	1,375		(609)	1,984
Dividends declared ($0.22 and $0.18 per common share for 2011 and 2010, respectively)	(4,086)					(4,086)
Ending Balance at Jun. 30, 2011	$ 524,463	$ 96	$ 177,266	$ (12,214)	$ (29,467)	$ 374,715	$ 14,067