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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

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