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Stockholders' Equity (Schedule of Restricted Stock Grants) (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Granted (in shares) | 0 | 14,018 | 17,439
Weighted average stock price (in usd per share) | $ 0 | $ 92.25 | $ 74.55
Fair value of stock granted | $ 0 | $ 1,293 | $ 1,300

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