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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2018 | Feb. 28, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options |  |  | 114,000 | 64,000 | 106,000 | 117,000
Deferred stock units issued to executive officers |  | 63,677 |  |  |  |
Deferred stock units issued to executive officers, aggregate fair value |  | $ 6.9 |  |  |  |
Weighted Average |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred stock units issued to executive officers, exercise price |  | $ 108.47 |  |  |  |
Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized to be repurchased | 150,000,000.0 |  |  |  |  |
Stock repurchase program, period in force | 3 years |  |  |  |  |

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