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Stockholders' Equity - Stock Options Granted (Details)
107 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 7,149,050
Options Outstanding (in shares) 4,278,972
Options Exercisable (in shares) 1,184,946
January 2, 2018  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 520,601
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 55.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 54.54
Options Outstanding (in shares) 512,151
Options Exercisable (in shares) 0
January 3, 2017  
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) 696,504
Options Exercisable (in shares) 0
April 19, 2016  
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) 718,070
Options Exercisable (in shares) 0
April 21, 2015  
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) 654,352
Options Exercisable (in shares) 137,638
April 22, 2014  
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) 543,500
Options Exercisable (in shares) 158,750
April 16, 2013  
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) 99,250
Options Exercisable (in shares) 54,000
April 17, 2012  
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) 905,187
Options Exercisable (in shares) 734,600
April 19, 2011  
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) 57,850
Options Exercisable (in shares) 32,850
April 20, 2010  
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) 45,550
Options Exercisable (in shares) 20,550
April 21, 2009  
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) 46,558
Options Exercisable (in shares) 46,558