Consolidated Statements Of Stockholders' Equity And Comprehensive Income (Loss) (USD $) In Thousands, except Share data	Common Stock [Member]	Common Stock, In Treasury [Member]	Additional Paid-In Capital [Member]	Deferred Stock-Based Compensation [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Comprehensive Income [Member]	Total
Treasury stock, balance at Dec. 31, 2008		$ (50,061)
Balance at Dec. 31, 2008	428		428,771	(446)	(2,730)	20,258		396,220
Treasury stock, shares at Dec. 31, 2008		3,008,121
Balance, shares at Dec. 31, 2008	42,841,737
Exercise of stock options, value	6		2,196					2,202
Exercise of stock options, shares	592,964
Directors deferred compensation stock units, value			300					300
Directors deferred compensation stock units, shares	18,097
Issuances of common stock under employee stock purchase plan, value	1		874					875
Issuances of common stock under employee stock purchase plan, shares	61,595
Compensation expense related to employee stock purchase plan			60					60
Foreign currency translation adjustment					7,928		7,928	7,928
Treasury stock, value		(379)						(379)
Treasury stock, shares		31,494
Unrealized gain (loss) on available for sale securities					968		968	968
Reversal of unrealized gain on available for sale securities					(15)		(15)	(15)
Issuance of restricted common stock grants, value	1		(1)
Issuance of restricted common stock grants, shares	61,243
Stock-based compensation expense			10,314	280				10,594
Restricted common stock-based compensation expense			6,350	118				6,468
Options and restricted common stock cancellations, value	(1)		(48)	48				(1)
Options and restricted common stock cancellations, shares	(105,691)
Net loss						(4,334)	(4,334)	(4,334)
Comprehensive income (loss)							23,268
Treasury stock, balance at Dec. 31, 2009		(50,440)
Balance at Dec. 31, 2009	435		448,816		6,151	15,924		420,886
Treasury stock, shares at Dec. 31, 2009		3,039,615
Balance, shares at Dec. 31, 2009	43,469,945
Exercise of stock options, value	3		2,267					2,270
Exercise of stock options, shares	372,269
Expired stock options			(841)					(841)
Issuances of common stock under employee stock purchase plan, value			697					697
Issuances of common stock under employee stock purchase plan, shares	42,098
Tax benefit from the exercise of stock options and restricted common stock			1,364					1,364
Foreign currency translation adjustment					2,481		2,481	2,481
Treasury stock, value		(643)						(643)
Treasury stock, shares		35,580
Unrealized gain (loss) on available for sale securities					(185)		(185)	(185)
Reversal of unrealized gain on available for sale securities					(589)		(589)	(589)
Issuance of restricted common stock grants, value	2		(2)
Issuance of restricted common stock grants, shares	169,728
Stock-based compensation expense			5,809					5,809
Restricted common stock-based compensation expense			5,501					5,501
Restricted common stock-based compensation expense	(3)		3
Options and restricted common stock cancellations, shares	(305,803)
Net loss						(27,833)	(27,833)	(27,833)
Comprehensive income (loss)							(2,858)
Treasury stock, balance at Dec. 31, 2010		(51,083)						(51,083)
Balance at Dec. 31, 2010	437		463,614		7,858	(11,909)		408,917
Treasury stock, shares at Dec. 31, 2010		3,075,195						3,075,195
Balance, shares at Dec. 31, 2010	43,748,237
Exercise of stock options, value	9		10,092					10,101
Exercise of stock options, shares	860,513							860,513
Directors deferred compensation stock units, value	0		200					200
Directors deferred compensation stock units, shares	9,384
Director's deferred restricted stock unit vest, value	0							0
Director's deferred restricted stock unit vest, Shares	34,440
Issuances of common stock under employee stock purchase plan, value	0		669					669
Issuances of common stock under employee stock purchase plan, shares	33,127
Foreign currency translation adjustment					(1,324)		(1,324)	(1,324)
Treasury stock, value		(484)						(484)
Treasury stock, shares		23,998
Unrealized gain (loss) on available for sale securities					7		7	7
Reversal of unrealized gain on available for sale securities					(178)		(178)	(178)
Issuance of restricted common stock grants, value	3		(3)
Issuance of restricted common stock grants, shares	272,189
Stock-based compensation expense			4,961					4,961
Restricted common stock-based compensation expense			6,751					6,751
Net loss						65,135	65,135	65,135
Comprehensive income (loss)							63,640
Treasury stock, balance at Dec. 31, 2011		(51,567)						(51,567)
Balance at Dec. 31, 2011	$ 450		$ 486,284		$ 6,363	$ 53,226		$ 494,756
Treasury stock, shares at Dec. 31, 2011		3,099,193						3,099,193
Balance, shares at Dec. 31, 2011	44,957,890