Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2009	$ 115,898	$ 442	$ (28,130)	$ 328,643	$ 1,046	$ (186,103)
Common Stock, Shares, Issued at Dec. 31, 2009		44,225,000	(3,219,000)
Options and SARS, Exercises in Period, Shares	(1,647,115)	1,647,000
Stock Issued During Period, Value, Stock Options Exercised	12,532	16		12,516
Release of performance shares, Shares		723,000
Release of performance shares, value	0	7		(7)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		250,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	3		(3)
Stock Received for Payment of Option Exercise Price Shares		(1,291,000)
Stock Received for Payment of Option Exercise Price	(11,959)	(13)		(11,946)
Stock Received for Payment of Employee Taxes on Vesting of Performance Shares and Upon Exercise of Stock Options Shares		(343,000)
Stock Received for Payment of Employee Taxes on Vesting of Performance Shares and Upon Exercise of Stock Options	(3,013)	(3)		(3,010)
Share-based Compensation	12,328			12,328
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(500)				(500)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	15				15
Net income (loss)	31,312					(31,312)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2010	93,989	452	(28,130)	338,521	561	(217,415)
Common Stock, Shares, Issued at Dec. 31, 2010		45,211,000	(3,219,000)
Options and SARS, Exercises in Period, Shares	(504,561)	505,000
Stock Issued During Period, Value, Stock Options Exercised	3,605	5		3,600
Release of performance shares, Shares		549,000
Release of performance shares, value	0	5		(5)
Stock Received for Payment of Option Exercise Price Shares		(281,000)
Stock Received for Payment of Option Exercise Price	(2,660)	(3)		(2,657)
Stock Received for Payment of Employee Taxes on Vesting of Performance Shares and Upon Exercise of Stock Options Shares		(243,000)
Stock Received for Payment of Employee Taxes on Vesting of Performance Shares and Upon Exercise of Stock Options	(2,158)	(2)		(2,156)
Share-based Compensation	9,649			9,649
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(302)				(302)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(15)				(15)
Net income (loss)	13,000					(13,000)
Stockholders' Equity Attributable to Parent, Period End at Dec. 31, 2011	89,108
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2011	89,108	457	(28,130)	346,952	244	(230,415)
Common Stock, Shares, Issued at Dec. 31, 2011	45,740,637	45,741,000	(3,219,000)
Options and SARS, Exercises in Period, Shares	0
Release of performance shares, Shares		883,000
Release of performance shares, value	0	9		(9)
Stock Received for Payment of Employee Taxes on Vesting of Performance Shares and Upon Exercise of Stock Options Shares		(354,000)
Stock Received for Payment of Employee Taxes on Vesting of Performance Shares and Upon Exercise of Stock Options	(1,333)	(3)		(1,330)
Sale of subsidiary shares to non controlling interest	1,960						1,960
Share-based Compensation	6,976			6,976
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	259				259
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	6				6
Net income (loss)	13,181					(12,818)	(363)
Stockholders' Equity Attributable to Parent, Period End at Dec. 31, 2012	82,198
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2012	$ 83,795	$ 463	$ (28,130)	$ 352,589	$ 509	$ (243,233)	$ 1,597
Common Stock, Shares, Issued at Dec. 31, 2012	46,270,136	46,270,000	(3,219,000)