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Stockholders' Equity (Stock Options Granted) (Details) | 104 Months Ended
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Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted (in shares) | 6,628,449
Options Outstanding (in shares) | 3,948,908
Options Exercisable (in shares) | 1,280,499
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) | 713,097
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) | 738,611
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) | 674,499
Options Exercisable (in shares) | 142,072
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) | 567,500
Options Exercisable (in shares) | 158,750
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) | 101,750
Options Exercisable (in shares) | 55,250
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) | 952,001
Options Exercisable (in shares) | 772,977
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) | 60,350
Options Exercisable (in shares) | 35,350
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) | 79,550
Options Exercisable (in shares) | 54,550
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) | 61,550
Options Exercisable (in shares) | 61,550

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