Earnings (Loss) per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic earnings per share [Abstract]
Net income (loss)	$ 72,017	$ 12,114	$ 177,521	$ (48,441)
Weighted average common shares outstanding (in shares)	338,626,000	337,868,000	338,488,000	302,996,000
Basic income (loss) per share (in dollars per share)	$ 0.21	$ 0.04	$ 0.52	$ (0.16)
Diluted earnings per share [Abstract]
Net income (loss)	72,017	12,114	177,521	(48,441)
Effect of dilutive securities [Abstract]
2% Convertible Senior Notes	3,049	0	9,148	0
Net income (loss) plus assumed conversions	$ 75,066	$ 12,114	$ 186,669	$ (48,441)
Weighted-average shares - Basic (in shares)	338,626,000	337,868,000	338,488,000	302,996,000
Common stock equivalents (in shares)	74,950,000	1,558,000	74,985,000	0
Weighted-average shares - Diluted (in shares)	413,576,000	339,426,000	413,473,000	302,996,000
Diluted income (loss) per share (in dollars per share)	$ 0.18	$ 0.04	$ 0.45	$ (0.16)
Participating Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from EPS calculation (in shares)				100,000
Participating securities included weighted average number of common shares outstanding (in shares)	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	109,600,000