Unaudited Condensed Consolidated Statement of Stockholders' 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]	Deferred Compensation Expense [Member]	Total
Balance at December 31, 2012 at Dec. 31, 2012	$ 266	$ 389,881	$ 579,062	$ 59,875	$ (11,533)	$ 10,331	$ 1,027,882
Balance at December 31, 2012 (in Shares) at Dec. 31, 2012					(367,000)
Net income			2,871				2,871
Issuance of common stock	2	1,919					1,921
Deferred compensation plan		49			(169)	169	49
Deferred compensation plan (in Shares)					(3,000)
Stock repurchases					(11,751)		(11,751)
Stock repurchases (in Shares)					(329,000)
Cash dividends declared			(6,562)				(6,562)
Translation adjustment				(35,629)			(35,629)
Balance at March 31, 2013 at Mar. 31, 2013	$ 268	$ 391,849	$ 575,371	$ 24,246	$ (23,453)	$ 10,500	$ 978,781
Balance at March 31, 2013 (in Shares) at Mar. 31, 2013					(699,000)