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Stock-Based Compensation (Summary of Company's SARs Activity) (Details) - SARs [Member]
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance | shares 155,292
Exercised | shares (10,293)
Exercisable | shares 144,999
Beginning balance, Weighted-Average Exercise Price | $ / shares $ 32.58
Exercised, Weighted-Average Exercise Price | $ / shares 26.72
Exercisable, Weighted-Average Exercise Price | $ / shares $ 32.99
Beginning balance, Average Remaining Contractual Term Years 2 years 11 months 1 day
Exercisable, Average Remaining Contractual Term Years 2 years 8 months 15 days
Beginning balance, Aggregate Intrinsic Value | $ $ 3,908
Exercisable, Aggregate Intrinsic Value | $ $ 665