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Stockholders' Equity - Stock Options Granted (Details)
107 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 9,948,220
Options Outstanding (in shares) 3,512,081
Options Exercisable (in shares) 901,375
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) 806,206
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) 690,000
Options Exercisable (in shares) 5,000
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) 125,000
Options Exercisable (in shares) 2,500
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) 1,033,250
Options Exercisable (in shares) 341,250
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) 245,300
Options Exercisable (in shares) 145,300
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) 186,700
Options Exercisable (in shares) 96,700
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) 269,100
Options Exercisable (in shares) 179,100
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) 118,250
Options Exercisable (in shares) 93,250
April 17, 2007 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 4,380,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 22.50
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 20.15
Options Outstanding (in shares) 38,275
Options Exercisable (in shares) 38,275