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Stockholders' Equity (Stock Options Granted) (Details) | 105 Months Ended
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Dec. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted (in shares) | 6,413,660
Options Outstanding (in shares) | 3,757,947
Options Exercisable (in shares) | 1,200,250
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) | 789,363
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) | 738,834
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) | 608,750
Options Exercisable (in shares) | 122,500
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) | 981,500
Options Exercisable (in shares) | 682,250
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) | 83,900
Options Exercisable (in shares) | 46,400
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) | 147,300
Options Exercisable (in shares) | 94,800
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) | 228,650
Options Exercisable (in shares) | 186,150
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) | 64,650
Options Exercisable (in shares) | 64,650

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