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Stockholders' Equity - Stock Options Granted (Details)
101 Months Ended
Sep. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 6,628,449
Options Outstanding (in shares) 4,220,498
Options Exercisable (in shares) 1,301,603
January 3, 2017 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 764,789
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 47.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 46.95
Options Outstanding (in shares) 725,542
Options Exercisable (in shares) 0
April 19, 2016 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 845,440
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 46.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 45.74
Options Outstanding (in shares) 757,522
Options Exercisable (in shares) 0
April 21, 2015 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 893,220
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 42.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 41.26
Options Outstanding (in shares) 700,746
Options Exercisable (in shares) 0
April 22, 2014 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 955,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 56.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 50.53
Options Outstanding (in shares) 572,500
Options Exercisable (in shares) 116,250
April 16, 2013 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 205,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 54.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 49.25
Options Outstanding (in shares) 104,250
Options Exercisable (in shares) 57,250
April 17, 2012 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 1,235,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 54.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 49.01
Options Outstanding (in shares) 957,938
Options Exercisable (in shares) 776,103
April 19, 2011 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 410,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 35.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 31.78
Options Outstanding (in shares) 72,550
Options Exercisable (in shares) 47,550
April 20, 2010 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 530,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 30.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 27.13
Options Outstanding (in shares) 107,800
Options Exercisable (in shares) 82,800
April 21, 2009 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 790,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 27.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 17.61
Options Outstanding (in shares) 221,650
Options Exercisable (in shares) 221,650