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Stockholders' Equity (Schedule of Restricted Stock Grants) (Details) - Restricted Stock - USD ($) $ / shares in Units, shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Granted | $ 14,018 | $ 17,439 | $ 20,558
Weighted average stock price | $ 92.25 | $ 74.55 | $ 59.32
Fair value of stock granted | 1,293 | 1,300 | 1,220

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