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
Balance at Dec. 31, 2007
Cumulative effect of restatement on prior years (See Note 2)		$ 0	$ 0	$ (801)	$ (112)	$ 0	$ 0	$ (912)
Balance (restated)	[1]	320	86,530	261,652	(4,833)	(18,196)	2,149	327,442
Balance at Dec. 31, 2008		320	86,350	262,453	(4,721)	(18,196)	2,149	328,355
Balance (in shares) at Dec. 31, 2008	[1]	32,015,771
Net income (loss)	[1]			32,042			(105)	31,937
Cash dividends	[1]			(22,052)				(22,052)
Issuance of treasury shares pursuant to employee stock compensation plans	[1]		(282)			3,819		3,537
Tax benefit from employee stock compensation plans	[1]		730					730
Vesting of common stock in connection with employee stock compensation plans	[1]		2,570					2,570
Purchase of noncontrolling interest	[1]		(4,538)				(990)	(5,528)
Other comprehensive income (loss)	[1]				36,836		373	37,209
Other	[1]						(306)	(306)
Balance at Dec. 31, 2009	[1]	320	84,830	271,642	32,003	(14,377)	1,121	375,539
Balance (in shares) at Dec. 31, 2009	[1]	32,015,771
Net income (loss)	[1]			29,235			(752)	28,483
Cash dividends	[1]			(22,358)				(22,358)
Issuance of treasury shares pursuant to employee stock compensation plans	[1]		2,723			5,432		8,155
Tax benefit from employee stock compensation plans	[1]		285					285
Vesting of common stock in connection with employee stock compensation plans	[1]		4,535					4,535
Purchase of noncontrolling interest	[1]		2,701					2,701
Deconsolidation of variable interest entity	[1]						(958)	(958)
Other comprehensive income (loss)	[1]				(3,263)		940	(2,323)
Balance at Dec. 31, 2010	[1]	320	95,074	278,519	28,740	(8,945)	351	394,059
Balance (in shares) at Dec. 31, 2010	[1]	32,015,771
Net income (loss)	[1]			58,521			15	58,536
Cash dividends	[1]			(22,762)				(22,762)
Issuance of treasury shares pursuant to employee stock compensation plans	[1]		2,569			5,519		8,088
Tax benefit from employee stock compensation plans	[1]		593					593
Vesting of common stock in connection with employee stock compensation plans	[1]		4,885					4,885
Purchase of noncontrolling interest	[1]		(5,402)				(300)	(5,702)
Sale of subsidiary shares to noncontrolling interest	[1]		(3,403)		(1,390)		4,793	0
Other comprehensive income (loss)	[1]				(42,069)		(742)	(42,811)
Balance at Dec. 31, 2011	[1]	$ 320	$ 94,316	$ 314,278	$ (14,719)	$ (3,426)	$ 4,117	$ 394,886
Balance (in shares) at Dec. 31, 2011	[1]	32,015,771

[1] Restated