Income (Loss) Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
EPS Numerator - Basic:
Net income	$ 7,355	$ (6,132)	$ (3,208)	$ (15,282)
EPS Denominator - Basic:
Weighted-average number of shares of common stock outstanding	86,903,000	83,200,000	86,880,000	75,691,000
EPS Numerator - Diluted:
Net income	7,355	(6,132)	(3,208)	(15,282)
Adjustment for interest and financing costs:
Convertible notes	244
Net income	$ 7,599
EPS Denominator - Diluted:
Weighted-average number of shares of common stock outstanding	86,903,000	83,200,000	86,880,000	75,691,000
Stock options and awards	1,526,000
Convertible debt	3,041,000
Dilutive potential common shares	4,567,000
Weighted-average common shares and dilutive potential common shares	91,470,000	83,200,000	86,880,000	75,691,000
Basic net income per common share	$ 0.08	$ (0.07)	$ (0.04)	$ (0.20)
Diluted net income per common share	$ 0.08	$ (0.07)	$ (0.04)	$ (0.20)