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Stock Plans (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Summary of Stock Option and RSA Activity  
Beginning Balance, Shares | shares 10,820
Stock Options Granted, shares | shares 2,920
Stock Options Exercised, shares | shares (3,396)
Forfeited, shares | shares (67)
Stock Options Expired, shares | shares (5)
Ending Balance, Shares | shares 10,272
Beginning balance, weighted average exercise price | $ / shares $ 44.6
Stock Options Granted, weighted average exercise price | $ / shares 63.89
Stock Options Exercised, weighted average exercise price | $ / shares 51.4
Stock Options Forfeitures, weighted average exercise price | $ / shares 66.02
Stock Options Expired, weighted average exercise price | $ / shares 51.87
Ending balance, weighted average exercise price | $ / shares $ 47.68
Options vested and expected to vest, shares | shares 10,031
Options vested and expected to vest, Weighted Average Exercise Price | $ / shares $ 47.26
Options exercisable, shares | shares 6,963
Options exercisable, Weighted Average Exercise Price | $ / shares $ 38.55
Beginning balance, shares | shares 7,433
RSAs Granted, shares | shares 4,062
Vested, shares | shares (3,128)
Forfeited, shares | shares (867)
Ending balance, shares | shares 7,500
Beginning Balance, Weighted Average Grant Price | $ / shares $ 74.67
Granted, Weighted Average Grant Price | $ / shares 55.55
RSAs Vested, Weighted Average Grant Price | $ / shares 63.93
RSAs Forfeited, Weighted Average Grant Price | $ / shares 70.99
Ending Balance, Weighted Average Grant Price | $ / shares $ 69.22