Stock-Based Compensation - Long-Term Performance-Based Plans - Additional (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 13,037	$ 19,199	$ 34,153
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	4,312,000
Weighted-Average Exercise Price (in dollars per share)	$ 31.39
Restricted Performance Units (in shares)	1,336,000	1,382,250	1,798,331	1,943,497
LTIP 2013
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Remaining expense estimated to be recognized during 2016	$ 7,067
Estimated contingent expense subsequent to 2016	40,469
Total estimated remaining expense over the term of plan	47,536
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 2,565	$ 10,157	$ 12,361
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	1,472,000
Weighted-Average Exercise Price (in dollars per share)	$ 43.50
Restricted Performance Units (in shares)	736,000
Other Employee Performance Awards
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Remaining expense estimated to be recognized during 2016	$ 1,070
Estimated contingent expense subsequent to 2016	134,580
Total estimated remaining expense over the term of plan	135,650
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 1,424	1,694	14,095
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	2,840,000
Weighted-Average Exercise Price (in dollars per share)	$ 25.12
Restricted Performance Units (in shares)	600,000
Other Employee Performance Awards | Continuing operations [Member]
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 3,989	$ 11,851	$ 26,456