Condensed Consolidated Statement of Changes In Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2013	$ 416,814	$ 198	$ (22,370)	$ 192,537	$ 250,744	$ (4,295)
Treasury Stock Beginning Balance, Shares at Dec. 31, 2013	(1,258,250)		(1,258,250)
Beginning Balance, Shares at Dec. 31, 2013	19,855,430	19,855,430
Comprehensive income	43,174				36,801	6,373
Options exercised	1,820	2		1,818
Options exercised, Shares	204,667	204,667
Tax benefit from share-based payments	1,975			1,975
Restricted common stock issued
Restricted common stock issued, Shares		5,978
Share-based compensation	764			764
Dividends to stockholders	(16,064)				(16,064)
Ending Balance at Sep. 30, 2014	$ 448,483	$ 200	$ (22,370)	$ 197,094	$ 271,481	$ 2,078
Treasury Stock Ending Balance, Shares at Sep. 30, 2014	(1,258,250)		(1,258,250)
Ending Balance, Shares at Sep. 30, 2014	20,066,075	20,066,075