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, 2014	$ 446,968	$ 201	$ (22,370)	$ 199,138	$ 267,189	$ 2,810
Treasury Stock Beginning Balance, Shares at Dec. 31, 2014	(1,258,250)		(1,258,250)
Beginning Balance, Shares at Dec. 31, 2014	18,897,686	20,155,936
Comprehensive income	15,948				15,130	818
Options exercised	557	1		556
Options exercised, Shares	74,250	74,250
Tax benefit from share-based payments	809			809
Restricted common stock issued	0	0	0	0	0	0
Restricted common stock issued, Shares		6,757
Share-based compensation	211			211
Dividends to stockholders	(2,840)				(2,840)
Ending Balance at Mar. 31, 2015	$ 461,653	$ 202	$ (22,370)	$ 200,714	$ 279,479	$ 3,628
Treasury Stock Ending Balance, Shares at Mar. 31, 2015	(1,258,250)		(1,258,250)
Ending Balance, Shares at Mar. 31, 2015	18,978,693	20,236,943