Basic and Diluted Net Income (Loss) Per Share - Performance based stock (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	61,102	55,650	53,547
Strike price of the warrants	$ 86.08
Anti-dilutive stock awards
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	4,377	1,694	1,870
Performance based options
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	8,970	5,491	4,312
Restricted Performance Units/Awards
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	1,726	2,436	1,336
Common stock warrants
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	46,029	46,029	46,029