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			12,727				12,727
Issuance of common stock	3	6,571					6,574
Deferred compensation plan		113			3,062	(3,062)	113
Deferred compensation plan (in Shares)					67,000
Stock repurchases					(11,511)		(11,511)
Stock repurchases (in Shares)					(324,000)
Cash dividends declared			(13,184)				(13,184)
Translation adjustment				(44,489)			(44,489)
Balance at June 30, 2013 at Jun. 30, 2013	$ 269	$ 396,565	$ 578,605	$ 15,386	$ (19,982)	$ 7,269	$ 978,112
Balance at June 30, 2013 (in Shares) at Jun. 30, 2013					(624,000)