CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earning (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Dec. 31, 2010	$ 26,181,000		$ 192,711,000	$ (18,195,000)	$ (1,791,000)	$ 198,906,000
Balance (in shares) at Dec. 31, 2010	26,181,281
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				8,918,000		8,918,000
Issuance of common stock	7,015,000		47,486,000			54,501,000
Issuance of common stock (in shares)	7,015,000
Common stock issued from option exercises, net of tax benefits (in shares)						0
Stock-based compensation			1,800,000			1,800,000
Purchase of treasury shares (100,000 shares)		(866,000)				(866,000)
Other comprehensive income, net of reclassification adjustments and tax					8,220,000	8,220,000
Balance at Dec. 31, 2011	33,196,000	(866,000)	241,997,000	(9,277,000)	6,429,000	271,479,000
Balance (in shares) at Dec. 31, 2011	33,196,281
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				16,624,000		16,624,000
Issuance of common stock	4,000,000		37,713,000			41,713,000
Issuance of common stock (in shares)	4,000,000
Common stock issued from option exercises, net of tax benefits	51,000		403,000			454,000
Common stock issued from option exercises, net of tax benefits (in shares)	50,374					50,374
Stock-based compensation			2,595,000			2,595,000
Other comprehensive income, net of reclassification adjustments and tax					3,812,000	3,812,000
Balance at Dec. 31, 2012	37,247,000	(866,000)	282,708,000	7,347,000	10,241,000	336,677,000
Balance (in shares) at Dec. 31, 2012	37,246,655
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				25,110,000		25,110,000
Issuance of common stock	176,000		1,453,000			1,629,000
Issuance of common stock (in shares)	175,790
Common stock issued from option exercises, net of tax benefits	158,000		1,495,000			1,653,000
Common stock issued from option exercises, net of tax benefits (in shares)	158,272					605,494
Common stock issued from option exercises, caashless exercise, net of tax benefits	140,000		4,702,000	(4,842,000)
Common stock issued from option exercises, caashless exercise, net of tax benefits (in shares)	140,228					140,228
Stock-based compensation			3,157,000			3,157,000
Stock-based income tax benefit			1,061,000			1,061,000
Other comprehensive income, net of reclassification adjustments and tax					(9,683,000)	(9,683,000)
Balance at Dec. 31, 2013	$ 37,721,000	$ (866,000)	$ 294,576,000	$ 27,615,000	$ 558,000	$ 359,604,000
Balance (in shares) at Dec. 31, 2013	37,720,945