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Stockholders' Equity - Stock Options Granted (Details)
98 Months Ended
Jun. 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) 4,297,369
Options Exercisable (in shares) 1,309,103
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) 747,772
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) 771,432
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) 712,290
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) 582,500
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) 110,000
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) 965,125
Options Exercisable (in shares) 778,603
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) 73,800
Options Exercisable (in shares) 48,800
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) 110,300
Options Exercisable (in shares) 84,050
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) 224,150
Options Exercisable (in shares) 224,150