CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings
Balance at Dec. 31, 2010	$ 295,728	$ 27	$ (107,899)	$ 386,395	$ 4,246	$ 12,959
Balance (in shares) at Dec. 31, 2010		27,112,000
Issuance of common stock through:
Exercise of options and restricted stock	7,423	1		7,422
Exercise of options and restricted stock (in shares)		412,000
Employee stock purchase plan	264			264
Employee stock purchase plan (in shares)		9,000
Contribution to employee benefit plan	913		773	140
Contribution to employee benefit plan (in shares)		29,000
Stock compensation	6,226			6,226
Income tax effect of exercise of stock options	133			133
Accrued dividends and accretion charges on Series A 3% Redeemable Convertible Preferred Stock	(3,416)					(3,416)
Currency translation adjustment	369				369
Net Income (Loss)	(902)					(902)
Balance at Dec. 31, 2011	306,738	28	(107,126)	400,580	4,615	8,641
Balance (in shares) at Dec. 31, 2011		27,562,000
Issuance of common stock through:
Exercise of options and restricted stock	4,104			4,104
Exercise of options and restricted stock (in shares)		380,000
Employee stock purchase plan	272			272
Employee stock purchase plan (in shares)		9,000
Contribution to employee benefit plan	789		701	88
Contribution to employee benefit plan (in shares)		26,000
Stock compensation	8,616			8,616
Accrued dividends and accretion charges on Series A 3% Redeemable Convertible Preferred Stock	(3,575)					(3,575)
Currency translation adjustment	685				685
Net Income (Loss)	46,378					46,378
Balance at Dec. 31, 2012	364,007	28	(106,425)	413,660	5,300	51,444
Balance (in shares) at Dec. 31, 2012		27,977,000
Issuance of common stock through:
Exercise of options and restricted stock	8,000			8,000
Exercise of options and restricted stock (in shares)		460,000
Employee stock purchase plan	219			219
Employee stock purchase plan (in shares)		6,000
Contribution to employee benefit plan	846		627	219
Contribution to employee benefit plan (in shares)		23,000
Stock compensation	7,511			7,511
Income tax effect of exercise of stock options	370			370
Accrued dividends and accretion charges on Series A 3% Redeemable Convertible Preferred Stock	(3,735)					(3,735)
Currency translation adjustment	(179)				(179)
Net Income (Loss)	26,056					26,056
Balance at Dec. 31, 2013	$ 403,095	$ 28	$ (105,798)	$ 429,979	$ 5,121	$ 73,765
Balance (in shares) at Dec. 31, 2013		28,466,000