Stock-Based Compensation (Details 7) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 30,655	$ 40,970	$ 31,521
Continuing operations
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	29,730	39,327	31,213
Discontinued operations
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	925	1,643	308
Long-Term Performance Based Plans
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	15,253	17,283	19,240
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	7,790,500	7,929,250	9,549,375
Weighted-Average Exercise Price (in dollars per share)	$ 24.02	$ 18.85	$ 19.20
Restricted Performance Units (in shares)	1,943,497	1,185,080	1,284,708
LTIP 2005
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	3,200,500
Weighted-Average Exercise Price (in dollars per share)	$ 20.33
Restricted Performance Units (in shares)	288,497
LTIP 2008
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	2,889	9,246	18,944
LTIP 2013
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Remaining expense estimated to be recognized during 2014	5,460
Estimated contingent expense subsequent to 2014	52,311
Total estimated remaining expense over the term of plan	57,771
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	8,137
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	1,920,000
Weighted-Average Exercise Price (in dollars per share)	$ 36.53
Restricted Performance Units (in shares)	960,000
Other Employee Performance Awards
Estimated Remaining Non-Cash, Stock-Based Compensation Expense
Remaining expense estimated to be recognized during 2014	432
Estimated contingent expense subsequent to 2014	38,817
Total estimated remaining expense over the term of plan	39,249
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	4,045	7,471	218
Outstanding awards pursuant to performance-based stock incentive plans
Performance Based Stock Options (in shares)	2,670,000
Weighted-Average Exercise Price (in dollars per share)	$ 19.46
Restricted Performance Units (in shares)	695,000
Other Employee Performance Awards | Continuing operations
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	15,071	16,717	19,162
Other Employee Performance Awards | Discontinued operations
Recognized non-cash stock-based compensation expense
Non-cash stock-based compensation expense recognized	$ 182	$ 566	$ 78