Basic and Diluted Net Income (Loss) Per Share - Performance based stock (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive securities excluded from computation of earnings per share
Strike price of the warrants	$ 86.08
Class A common stock
Antidilutive securities excluded from computation of earnings per share
Strike price of the warrants	$ 0.01	$ 0.01
Anti-dilutive stock awards
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	1,870	712	447
Performance based options
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	4,312	3,905	7,247
Restricted Performance Units
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	1,336	1,382	1,798
Common stock warrants
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	46,029
Long-Term Performance Based Plans
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	53,547	5,999	9,492