Earnings (Loss) Per Common Share - Antidilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities excluded from the calculation of earning per share (in shares)	13,897	11,551	15,840
Exchangeable Class B common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities excluded from the calculation of earning per share (in shares)	1,399	1,831	7,285
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities excluded from the calculation of earning per share (in shares)	813	1,027	525
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities excluded from the calculation of earning per share (in shares)	1,324	2,517	2,829
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities excluded from the calculation of earning per share (in shares)	10,361	6,176	5,201