Unaudited Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands	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 Dec. 31, 2013	$ 269	$ 402,286	$ 623,221	$ 49,965	$ (18,690)	$ 6,290	$ 1,063,341
Balance (in Shares) at Dec. 31, 2013					(549)
Net income			30,756				30,756
Dividends			(13,338)				(13,338)
Issuance of common stock	1	4,165					4,166
Treasury stock					(1,174)		(1,174)
Treasury stock (in Shares)					(22)
Deferred compensation plan		217			(1,015)	1,015	217
Deferred compensation plan (in Shares)					(22)
Translation adjustment				15,884			15,884
Balance at Jun. 30, 2014	$ 270	$ 406,668	$ 640,639	$ 65,849	$ (20,879)	$ 7,305	$ 1,099,852
Balance (in Shares) at Jun. 30, 2014					(593)