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Stock-Based Compensation, Stock Options (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Stock Options [Member]  
Number of Shares [Roll Forward]  
Outstanding at beginning of year (in shares) | shares 5,932,900
Granted (in shares) | shares 298,000
Exercised (in shares) | shares (1,177,400)
Forfeited/cancelled/expired (in shares) | shares (1,359,100)
Outstanding at end of year (in shares) | shares 3,694,400
Exercisable at end of year (in shares) | shares 1,019,600
Weighted-Average Exercise Price [Roll Forward]  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 51.42
Granted (in dollars per share) | $ / shares 50.93
Exercised (in dollars per share) | $ / shares 31.92
Forfeited/cancelled/expired (in dollars per share) | $ / shares 60.69
Outstanding at end of year (in dollars per share) | $ / shares 54.17
Exercisable at end of year (in dollars per share) | $ / shares $ 40.96
Remaining Contractual Term and Aggregate Intrinsic Value [Abstract]  
Outstanding options, weighted-average remaining contractual term 3 years 10 months 24 days
Outstanding options, aggregate intrinsic value | $ $ 67,962
Exercisable options, weighted-average remaining contractual term 3 years 8 months 23 days
Exercisable options, aggregate intrinsic value | $ $ 29,838
Service-Based Options [Member]  
Number of Shares [Roll Forward]  
Outstanding at beginning of year (in shares) | shares 2,207,000
Granted (in shares) | shares 0
Exercised (in shares) | shares (324,400)
Forfeited/cancelled/expired (in shares) | shares (489,700)
Outstanding at end of year (in shares) | shares 1,392,900
Exercisable at end of year (in shares) | shares 725,500
Weighted-Average Exercise Price [Roll Forward]  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 39.93
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 34.71
Forfeited/cancelled/expired (in dollars per share) | $ / shares 43.85
Outstanding at end of year (in dollars per share) | $ / shares 39.76
Exercisable at end of year (in dollars per share) | $ / shares $ 43.14
Remaining Contractual Term and Aggregate Intrinsic Value [Abstract]  
Outstanding options, weighted-average remaining contractual term 4 years 4 months 10 days
Outstanding options, aggregate intrinsic value | $ $ 41,756
Exercisable options, weighted-average remaining contractual term 3 years 6 months 18 days
Exercisable options, aggregate intrinsic value | $ $ 20,237
Performance-Based Options [Member]  
Number of Shares [Roll Forward]  
Outstanding at beginning of year (in shares) | shares 3,725,900
Granted (in shares) | shares 298,000
Exercised (in shares) | shares (853,000)
Forfeited/cancelled/expired (in shares) | shares (869,400)
Outstanding at end of year (in shares) | shares 2,301,500
Exercisable at end of year (in shares) | shares 294,100
Weighted-Average Exercise Price [Roll Forward]  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 58.23
Granted (in dollars per share) | $ / shares 50.93
Exercised (in dollars per share) | $ / shares 30.86
Forfeited/cancelled/expired (in dollars per share) | $ / shares 70.17
Outstanding at end of year (in dollars per share) | $ / shares 62.89
Exercisable at end of year (in dollars per share) | $ / shares $ 35.58
Remaining Contractual Term and Aggregate Intrinsic Value [Abstract]  
Outstanding options, weighted-average remaining contractual term 3 years 7 months 10 days
Outstanding options, aggregate intrinsic value | $ $ 26,206
Exercisable options, weighted-average remaining contractual term 4 years 2 months 1 day
Exercisable options, aggregate intrinsic value | $ $ 9,601