Consolidated Statements of Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Beginning Balance at Dec. 31, 2008	$ 320	$ 86,350	$ 262,453	$ (4,721)	$ (18,196)	$ 2,149	$ 328,355
Beginning Balance, shares at Dec. 31, 2008	32,015,771
Net income (loss)			34,799			72	34,871
Cash dividends ($0.72 per share )			(22,052)				(22,052)
Issuance of 335,924, 472,917, 482,144 treasury shares pursuant to employee stock compensation plans and acquisitions in 2009, 2010 and 2011 respectively		(282)			3,819		3,537
Tax benefit from employee stock compensation plans		730					730
Vesting of common stock in connection with employee stock compensation plans		2,570					2,570
Purchase of noncontrolling interest shares		(4,538)				(990)	(5,528)
Other Comprehensive income (loss)				36,895		394	37,289
Ending Balance at Dec. 31, 2009	320	84,830	275,200	32,174	(14,377)	1,625	379,772
Ending Balance, shares at Dec. 31, 2009	32,015,771
Net income (loss)			30,347			(423)	29,924
Cash dividends ($0.72 per share )			(22,358)				(22,358)
Issuance of 335,924, 472,917, 482,144 treasury shares pursuant to employee stock compensation plans and acquisitions in 2009, 2010 and 2011 respectively		2,723			5,432		8,155
Tax benefit from employee stock compensation plans		285					285
Vesting of common stock in connection with employee stock compensation plans		4,535					4,535
Purchase of noncontrolling interest shares		2,701					2,701
Other Comprehensive income (loss)				(3,238)		660	(2,578)
Ending Balance at Dec. 31, 2010	320	95,074	283,189	28,936	(8,945)	1,862	400,436
Ending Balance, shares at Dec. 31, 2010	32,015,771
Net income (loss)			59,111			135	59,246
Cash dividends ($0.72 per share )			(22,762)				(22,762)
Issuance of 335,924, 472,917, 482,144 treasury shares pursuant to employee stock compensation plans and acquisitions in 2009, 2010 and 2011 respectively		2,569			5,519		8,088
Tax benefit from employee stock compensation plans		593					593
Vesting of common stock in connection with employee stock compensation plans		4,885					4,885
Purchase of noncontrolling interest shares		(5,189)				(546)	(5,735)
Sale of subsidiary shares to noncontrolling interest		(3,403)		(1,390)		4,793	0
Deconsolidation of variable interest entity						(1,254)	(1,254)
Other Comprehensive income (loss)				(42,514)		(763)	(43,277)
Ending Balance at Dec. 31, 2011	$ 320	$ 94,529	$ 319,538	$ (14,968)	$ (3,426)	$ 4,227	$ 400,220
Ending Balance, shares at Dec. 31, 2011	32,015,771