Earnings (Loss) per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic earnings per share [Abstract]
Net income (loss)	$ 45,522	$ 12,375	$ 105,504	$ (60,555)
Weighted average common shares outstanding (in shares)	338,626,000	337,868,000	338,419,000	285,336,000
Basic income (loss) per share (in dollars per share)	$ 0.13	$ 0.04	$ 0.31	$ (0.21)
Diluted earnings per share [Abstract]
Net income (loss)	45,522	12,375	105,504	(60,555)
Effect of dilutive securities [Abstract]
2% Convertible Senior Notes	3,049	0	6,098	0
Net income (loss) plus assumed conversions	$ 48,571	$ 12,375	$ 111,602	$ (60,555)
Weighted-average shares - Basic (in shares)	338,626,000	337,868,000	338,419,000	285,336,000
Common stock equivalents (in shares)	74,855,000	1,473,000	74,955,000	0
Weighted-average shares - Diluted (in shares)	413,481,000	339,341,000	413,374,000	285,336,000
Diluted income (loss) per share (in dollars per share)	$ 0.12	$ 0.04	$ 0.27	$ (0.21)
Participating Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from EPS calculation (in shares)				200,000
Participating securities included weighted average number of common shares outstanding	100,000	100,000	100,000
Common Stock Equivalents [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from EPS calculation (in shares)	54,500,000	126,500,000	54,500,000	100,300,000