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Stockholders' Equity (Stock Options Granted) (Details)
12 Months Ended 104 Months Ended
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Granted (in shares)   9,948,220
Options Outstanding (in shares) 4,530,982 4,530,982
Options Exercisable (in shares) 1,792,242 1,792,242
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 $ 41.26
Options Outstanding (in shares) 817,990 817,990
Options Exercisable (in shares) 0 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 $ 50.53
Options Outstanding (in shares) 797,500 797,500
Options Exercisable (in shares) 5,000 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 $ 49.25
Options Outstanding (in shares) 125,000 125,000
Options Exercisable (in shares) 2,500 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 $ 49.01
Options Outstanding (in shares) 1,039,500 1,039,500
Options Exercisable (in shares) 341,250 341,250
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 $ 31.78
Options Outstanding (in shares) 250,300 250,300
Options Exercisable (in shares) 150,300 150,300
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 $ 27.13
Options Outstanding (in shares) 210,350 210,350
Options Exercisable (in shares) 120,350 120,350
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 $ 17.61
Options Outstanding (in shares) 293,100 293,100
Options Exercisable (in shares) 200,600 200,600
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 $ 24.35
Options Outstanding (in shares) 147,750 147,750
Options Exercisable (in shares) 122,750 122,750
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 $ 20.15
Options Outstanding (in shares) 849,492 849,492
Options Exercisable (in shares) 849,492 849,492