Stock-Based Compensation - Long-Term Performance-Based Plans - Additional (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 14,262	$ 36,261	$ 29,941
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	7,965,501
Weighted-Average Exercise Price (in dollars per share)	$ 40.10
Restricted Performance Units (in shares)	1,504,370	1,760,225	2,484,720	1,336,000
2019 LTIP
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 15,300	$ 3,534
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Remaining expense estimated to be recognized during 2016	11,023
Estimated contingent expense subsequent to 2016	13,236
Total estimated remaining expense over the term of plan	$ 24,259
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	3,651,930
Weighted-Average Exercise Price (in dollars per share)	$ 35.13
LTIP 2013
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ (1,313)	(2,471)	$ (321)
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Estimated contingent expense subsequent to 2016	31,532
Total estimated remaining expense over the term of plan	$ 31,532
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	930,000
Weighted-Average Exercise Price (in dollars per share)	$ 41.28
LTIP 2017
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ (13,974)	3,334	10,640
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Estimated contingent expense subsequent to 2016	31,643
Total estimated remaining expense over the term of plan	$ 31,643
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	2,243,571
Weighted-Average Exercise Price (in dollars per share)	$ 57.26
Class A common stock
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	13,700,000
Other Employee Performance Awards
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ (569)	17,945	7,549
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Estimated contingent expense subsequent to 2016	61,322
Total estimated remaining expense over the term of plan	$ 61,322
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	1,140,000
Weighted-Average Exercise Price (in dollars per share)	$ 21.31
Restricted Performance Units (in shares)	1,018,800
Other Employee Performance Awards | Continuing operations [Member]
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ (556)	$ 22,342	$ 17,868
Restricted Performance Units/Awards
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	1,500,000
Restricted Performance Units (in shares)	1,483,800	1,726,250	2,435,500
Restricted Performance Units/Awards | LTIP 2013
Outstanding awards pursuant to performance-based stock incentive plans
Restricted Performance Units (in shares)	465,000
Restricted Performance Units/Awards | Class A common stock
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	1,500,000