Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock		Additional Paid-in Capital [Member]	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2008	$ 600,877	$ 313	[1]	$ 435,307	$ (10,431)	$ 175,688
Stock issued for benefit plans	1,378			(716)	2,094
Stock options exercised	326			326
Public Stock offering	108,751	62	[1]	108,689
Purchase of treasury shares	(884)				(884)
Tax benefits from stock compensation	(4,041)			(4,041)
Employee stock purchase plan	725	1	[1]	724
Issuance of restricted stock		3	[1]	(3)
Amortization of stock compensation	11,320			11,320
Net loss	(39,330)					(39,330)
Other comprehensive loss	(223)						(223)
Total comprehensive loss	(39,553)
Ending Balance at Dec. 31, 2009	678,899	379	[1]	551,606	(9,221)	136,358	(223)
Stock issued for benefit plans	1,513			242	1,271
Stock options exercised	2,087	1	[1]	2,086
Public Stock offering	140,139	40	[1]	140,099
Purchase of treasury shares	(1,828)				(1,828)
Tax benefits from stock compensation	28			28
Employee stock purchase plan	951	1	[1]	950
Issuance of restricted stock		3	[1]	(3)
Amortization of stock compensation	11,849			11,849
Net loss	46,294					46,294
Other comprehensive loss	85						85
Total comprehensive loss	46,379
Ending Balance at Dec. 31, 2010	880,017	424	[1]	706,857	(9,778)	182,652	(138)
Stock issued for benefit plans	1,612			791	821
Stock options exercised	1,151	1	[1]	1,150
Purchase of treasury shares	(3,393)				(3,393)
Tax benefits from stock compensation	333			333
Employee stock purchase plan	1,000	1	[1]	999
Issuance of restricted stock		4	[1]	(4)
Amortization of stock compensation	16,830			16,830
Net loss	98,821					98,821
Other comprehensive loss	138						138
Total comprehensive loss	98,959
Ending Balance at Dec. 31, 2011	$ 996,509	$ 430	[1]	$ 726,956	$ (12,350)	$ 281,473	$ (138)

[1] $.01 par value.