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 Dec. 31, 2013	$ 269	$ 402,286	$ 623,221	$ 49,965	$ (18,690)	$ 6,290	$ 1,063,341
Balance (in Shares) at Dec. 31, 2013					(549,000)
Net income			55,100				55,100
Dividends			(19,982)				(19,982)
Issuance of common stock	1	6,216					6,217
Treasury stock					(10,575)		(10,575)
Treasury stock (in Shares)					(278,000)
Deferred compensation plan		232			(1,345)	1,345	232
Deferred compensation plan (in Shares)					(32,000)
Translation adjustment				(24,511)			(24,511)
Balance at Sep. 30, 2014	$ 270	$ 408,734	$ 658,339	$ 25,454	$ (30,610)	$ 7,635	$ 1,069,822
Balance (in Shares) at Sep. 30, 2014					(859,000)