Basic and Diluted Net Income (Loss) Per Share - Performance based stock (Details) - shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	5,749	5,338
Stock awards | Class A common stock
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	1,800,000	600,000
Performance based options (1)
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	4,379	3,949
Restricted stock units
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	1,370	1,389