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Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Stock-Based Compensation [Abstract]    
Number of Shares, Outstanding at December 31, 2021 1,899,000  
Number of Shares, Granted 10,000 0
Number of Shares, Exercised (59,000)  
Number of Shares, Forfeited/canceled (1,000)  
Number of Shares, Outstanding at March 31, 2022 1,849,000  
Number of Shares, Exercisable at March 31, 2022 1,572,000  
Number of Shares, Unvested at March 31, 2022 277,000  
Weighted-Average Exercise Price Per Share, Outstanding at December 31, 2021 $ 157.76  
Weighted-Average Exercise Price Per Share, Granted 328.99  
Weighted-Average Exercise Price Per Share, Exercised 143.16  
Weighted-Average Exercise Price Per Share, Forfeited/canceled 174.28  
Weighted-Average Exercise Price Per Share, Outstanding at March 31, 2022 159.13  
Weighted-Average Exercise Price Per Share, Exercisable at March 31, 2022 153.68  
Weighted-Average Exercise Price Per Share, Unvested at March 31, 2022 $ 190.14  
Weighted-Average Remaining Contractual Life (in years), Outstanding at March 31, 2022 3 years 1 month 6 days  
Weighted-Average Remaining Contractual Life (in years), Exercisable at March 31, 2022 3 years  
Weighted-Average Remaining Contractual Life (in years), Unvested at March 31, 2022 4 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding at March 31, 2022 $ 341,859  
Aggregate Intrinsic Value, Exercisable at March 31, 2022 299,265  
Aggregate Intrinsic Value, Unvested at March 31, 2022 $ 42,594