Consolidated Statements of Equity (USD $) In Thousands, unless otherwise specified	Total		Common Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2011	$ 538,842		$ 96	$ 179,463	$ (14,997)	$ (43,090)	$ 402,523	$ 14,847
Increase (Decrease) in Stockholders' Equity
Net income	75,565						79,480	(3,915)
Net income (loss) attributable to the noncontrolling interests	(3,915)
Net Income (Loss) Attributable to Parent	79,480
Other comprehensive income (loss)	(2,289)					(2,289)
Proceeds received from minority investor/noncontrolling investor owner	6,100							6,100
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	4,602			2,164	2,438
Dividends declared	(11,375)						(11,375)
Ending Balance at Dec. 31, 2012	611,445		96	181,627	(12,559)	(45,379)	470,628	17,032
Increase (Decrease) in Stockholders' Equity
Net income	95,702						89,939	5,763
Net income (loss) attributable to the noncontrolling interests	5,763
Net Income (Loss) Attributable to Parent	89,939
Other comprehensive income (loss)	24,198	[1]				24,198
Proceeds received from minority investor/noncontrolling investor owner	152							152
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	5,035			2,698	2,337
Dividends declared	(12,111)						(12,111)
Performance share unit dividends equivalents	0			55			(55)
Ending Balance at Dec. 31, 2013	724,421		96	184,380	(10,222)	(21,181)	548,401	22,947
Increase (Decrease) in Stockholders' Equity
Net income	122,645
Net income (loss) attributable to the noncontrolling interests	12,919							12,919
Net Income (Loss) Attributable to Parent	109,726						109,726
Other comprehensive income (loss)	(33,414)	[1]				(33,414)
Cash distributions to noncontrolling interest	(14,920)							(14,920)
Stock awards, stock option exercises and other shares issued to employees and directors, net of income tax	8,662			7,282	1,380
Purchase of treasury shares	(901)				(901)
Payment of cash in lieu for stock split (187 shares)	(58)			(58)
Dividends declared	(13,436)						(13,436)
Shares issued for acquisitions (556 shares)	31,050			31,050
Performance share unit dividends equivalents	0			135			(135)
Ending Balance at Dec. 31, 2014	$ 824,049		$ 96	$ 222,789	$ (9,743)	$ (54,595)	$ 644,556	$ 20,946

[1] All amounts are net of tax. Amounts in parentheses indicate debits