Basic and Diluted Net Income (Loss) Per Share - Performance based stock (Details) - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Antidilutive securities excluded from computation of earnings per share
Strike price of the warrants	$ 86.08
Dilutive securities excluded from computation of earnings per share	56,960	55,742
Anti-dilutive stock awards
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	4,084	1,536
Performance based options
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	4,921	6,896
Restricted Performance Units/Awards
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	1,926	1,281
Common stock warrants
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	46,029	46,029