CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2010	$ 3,140	$ 101,271	$ 31,992	$ (16,876)	$ (11,892)	$ 107,635
Balance (in shares) at Dec. 31, 2010	31,409,638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			10,968			10,968
Other comprehensive income/(loss)					(19,695)	(19,695)
Exercise of stock options	3	142				145
Exercise of stock options (in shares)	31,500
Deferred compensation		(28)		80		52
Vested restricted stock		(911)		911		0
Vested performance stock		(393)		393		0
Stock option expense		1,028				1,028
Restricted stock expense		497				497
Performance stock expense		40				40
Repurchase of shares				(329)		(329)
Balance at Dec. 31, 2011	3,143	101,646	42,960	(15,821)	(31,587)	100,341
Balance (in shares) at Dec. 31, 2011	31,441,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			62,303			62,303
Other comprehensive income/(loss)					(2,504)	(2,504)
Exercise of stock options	26	1,329				1,355
Exercise of stock options (in shares)	263,092
Vested restricted stock		(604)		604		0
Stock option expense		1,303				1,303
Restricted stock expense		446				446
Performance stock expense		53				53
Balance at Dec. 31, 2012	3,169	104,173	105,263	(15,217)	(34,091)	163,297
Balance (in shares) at Dec. 31, 2012	31,704,230					31,704,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			25,915			25,915
Other comprehensive income/(loss)					15,129	15,129
Exercise of stock options	54	3,170				3,224
Exercise of stock options (in shares)	536,565
Vested restricted stock		(534)		534		0
Stock option expense		1,994				1,994
Restricted stock expense		427				427
Performance stock expense		404				404
Share based compensation tax windfall		131				131
Repurchase of shares				(301)		(301)
Balance at Dec. 31, 2013	$ 3,223	$ 109,765	$ 131,178	$ (14,984)	$ (18,962)	$ 210,220
Balance (in shares) at Dec. 31, 2013	32,240,795					32,240,795