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			16,557				16,557
Dividends			(6,654)				(6,654)
Issuance of common stock	1	1,915					1,916
Deferred compensation plan		151			(681)	681	151
Deferred compensation plan (in Shares)					(15)
Stock repurchases					(1,199)		(1,199)
Stock repurchases (in Shares)					(23)
Translation adjustment				8,175			8,175
Balance at Mar. 31, 2014	$ 270	$ 404,352	$ 633,124	$ 58,140	$ (20,570)	$ 6,971	$ 1,082,287
Balance (in Shares) at Mar. 31, 2014					(587)