Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net loss	$ (158,643)	$ (98,902)	$ (2,693,903)	$ (342,471)
Denominator:
Average number of common shares outstanding (in shares)	80,948,000	66,952,000	78,290,000	64,986,000
Basic and diluted net loss per share (in usd per share)	$ (1.96)	$ (1.48)	$ (34.41)	$ (5.27)
Anti-dilutive securities excluded from earnings per share calculation	2,371,794	1,726,828	2,341,281	1,437,046
Share-based awards exercised or released
Stock options exercised (in shares)	0	0	0	18,300
Restricted stock units vested (in shares)	1,344	3,337	120,353	81,889
Total (in shares)	1,344	3,337	120,353	100,189