Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of Stock Option Plan Activity
The following is a summary of our stock option and restricted stock activity and related information:
Stock Options  Restricted Stock Awards 
Shares  Weighted-Average Exercise Price  Shares  Weighted-Average Grant Date Fair Value 
Balance as of December 31, 2017  1,876,332  $ 53.17  133,294  $ 91.60 
Granted  224,312  161.83  62,033  169.91 
Options exercised/RSUs vested  (318,653) 58.64  (60,135) 83.95 
Forfeited  (12,228) 104.54  (1,165) 125.16 
Balance as of September 30, 2018  1,769,763  $ 65.60  134,027  $ 130.99 
Schedule of Restricted Stock Activity
The following is a summary of our stock option and restricted stock activity and related information:
Stock Options  Restricted Stock Awards 
Shares  Weighted-Average Exercise Price  Shares  Weighted-Average Grant Date Fair Value 
Balance as of December 31, 2017  1,876,332  $ 53.17  133,294  $ 91.60 
Granted  224,312  161.83  62,033  169.91 
Options exercised/RSUs vested  (318,653) 58.64  (60,135) 83.95 
Forfeited  (12,228) 104.54  (1,165) 125.16 
Balance as of September 30, 2018  1,769,763  $ 65.60  134,027  $ 130.99