Income (Loss) Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
EPS Numerator - Basic:
Net income	$ (12,389)	$ 7,355	$ (20,185)	$ (3,208)
EPS Denominator - Basic:
Weighted-average number of shares of common stock outstanding	97,321	86,903	92,886	86,880
EPS Numerator - Diluted:
Net income	(12,389)	7,355	(20,185)	(3,208)
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	97,321	86,903	92,886	86,880
Stock options and awards		1,526
Convertible debt		3,041
Dilutive potential common shares		4,567
Weighted-average common shares and dilutive potential common shares	97,321	91,470	92,886	86,880
Basic net income per common share	$ (0.13)	$ 0.08	$ (0.22)	$ (0.04)
Diluted net income per common share	$ (0.13)	$ 0.08	$ (0.22)	$ (0.04)