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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2018 | May 24, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Number of shares of common stock subject to awards |  |  |  |  | 1,500,000
Shares available for grant | 1,361,748 | 1,570,274 | 737,689 |  |
Amount of compensation exchanged for deferred stock units |  |  | $ 6,900 |  |
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options | 122,775 | 94,747 | 104,073 |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 150,000,000.0 |
Stock repurchase program, period in force | 3 years |  |  |  |
Stock repurchased during period (in shares) | 402,570 | 402,570 |  |  |
Weighted average price (in usd per share) | $ 71.28 |  |  |  |
Stock repurchased during period | $ 28,700 | $ 28,695 |  |  |
Deferred and Restricted Stock Unit |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation costs | $ 18,300 |  |  |  |
Unrecognized compensation costs, weighted-average recognition period | 1 year 4 months 24 days |  |  |  |
Stock Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation costs | $ 2,900 |  |  |  |
Unrecognized compensation costs, weighted-average recognition period | 10 months 24 days |  |  |  |

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