Stock-Based Compensation, Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Options [Member]
Options [Roll Forward]
Outstanding at beginning of year (in shares)	5,068,400
Granted (in shares)	2,205,000
Exercised (in shares)	(1,045,900)
Forfeited/cancelled/expired (in shares)	(294,600)
Outstanding at end of year (in shares)	5,932,900	5,068,400
Exercisable at end of year (in shares)	1,550,600
Options, Weighted-Average Exercise Price [Roll Forward]
Outstanding at beginning of year (in dollars per share)	$ 52.91
Granted (in dollars per share)	34.48
Exercised (in dollars per share)	18.54
Forfeited/cancelled/expired (in dollars per share)	66.82
Outstanding at end of year (in dollars per share)	51.42	$ 52.91
Exercisable at end of year (in dollars per share)	$ 38.91
Outstanding options, weighted-average remaining contractual term	4 years 18 days
Exercisable options, weighted-average remaining contractual term	1 year 7 months 2 days
Options, Additional Information [Abstract]
Aggregate intrinsic value	$ 51,991
Aggregate intrinsic value, exercisable	21,141
Fair value of options vested, net of tax			$ (4,200)
Fair value of options vested, net of tax	$ 1,000	$ 2,800
Service-Based Options [Member]
Options [Roll Forward]
Outstanding at beginning of year (in shares)	1,469,700
Granted (in shares)	1,465,900
Exercised (in shares)	(660,200)
Forfeited/cancelled/expired (in shares)	(68,400)
Outstanding at end of year (in shares)	2,207,000	1,469,700
Exercisable at end of year (in shares)	650,100
Options, Weighted-Average Exercise Price [Roll Forward]
Outstanding at beginning of year (in dollars per share)	$ 32.85
Granted (in dollars per share)	34.59
Exercised (in dollars per share)	11.56
Forfeited/cancelled/expired (in dollars per share)	47.27
Outstanding at end of year (in dollars per share)	39.93	$ 32.85
Exercisable at end of year (in dollars per share)	$ 48.95
Outstanding options, weighted-average remaining contractual term	5 years 25 days
Exercisable options, weighted-average remaining contractual term	2 years 5 months 16 days
Options, Additional Information [Abstract]
Aggregate intrinsic value	$ 27,021
Aggregate intrinsic value, exercisable	$ 6,381
Performance-Based Options [Member]
Options [Roll Forward]
Outstanding at beginning of year (in shares)	3,598,700
Granted (in shares)	739,100
Exercised (in shares)	(385,700)
Forfeited/cancelled/expired (in shares)	(226,200)
Outstanding at end of year (in shares)	3,725,900	3,598,700
Exercisable at end of year (in shares)	900,500
Options, Weighted-Average Exercise Price [Roll Forward]
Outstanding at beginning of year (in dollars per share)	$ 61.10
Granted (in dollars per share)	34.24
Exercised (in dollars per share)	30.47
Forfeited/cancelled/expired (in dollars per share)	72.74
Outstanding at end of year (in dollars per share)	58.23	$ 61.10
Exercisable at end of year (in dollars per share)	$ 31.67
Outstanding options, weighted-average remaining contractual term	3 years 5 months 12 days
Exercisable options, weighted-average remaining contractual term	11 months 16 days
Options, Additional Information [Abstract]
Aggregate intrinsic value	$ 24,970
Aggregate intrinsic value, exercisable	$ 14,760
Non-Vested Restricted Stock [Member]
Options, Weighted-Average Exercise Price [Roll Forward]
Granted (in dollars per share)	$ 39.62