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Stockholders' Equity - Stock Options Granted (Details)
108 Months Ended
Mar. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 7,178,449
Options Outstanding (in shares) 4,340,594
Options Exercisable (in shares) 1,083,000
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) 751,813
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) 777,409
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) 718,122
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) 587,500
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) 115,000
Options Exercisable (in shares) 3,500
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) 968,250
Options Exercisable (in shares) 673,250
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) 74,800
Options Exercisable (in shares) 37,300
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) 115,300
Options Exercisable (in shares) 62,800
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) 227,900
Options Exercisable (in shares) 185,400
April 15, 2008 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 550,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 27.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 24.35
Options Outstanding (in shares) 4,500
Options Exercisable (in shares) 4,500