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Stock-Based Compensation (Summary of Restricted Stock Unit Activity) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 21,021,000 | $ 19,126,000 | $ 17,778,000
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units outstanding, beginning, number of shares | 369,592 | 425,275 | 405,104
Granted, number of shares | 247,860 | 176,804 | 216,318
Vested, number of shares | (141,674) | (164,088) | (160,229)
Forfeited, number of shares | (64,925) | (68,399) | (35,918)
Restricted stock units outstanding, ending, number of shares | 410,853 | 369,592 | 425,275
Restricted stock units outstanding, beginning, weighted average grate date fair value per share | $ 88.88 | $ 80.37 | $ 76.45
Granted, weighted average grant date fair value per share | 85.27 | 96.07 | 78.90
Vested, weighted average grant date fair value | 87.64 | 75.61 | 68.72
Restricted stock units outstanding, ending, weighted average grate date fair value per share | $ 87.07 | $ 88.88 | $ 80.37
Stock-based compensation expense | $ 13,200,000 | $ 12,200,000 | $ 10,800,000
Unrecognized costs related to share based compensation | $ 21,700,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 2 months 26 days |  |
Grant date fair value of vested units | $ 12,400,000 | $ 12,400,000 | $ 11,000,000
Company withheld shares | 47,130 | 56,792 | 54,543
Company withheld shares, tax obligations | $ 4,200,000 | $ 5,800,000 | $ 4,500,000
Forfeited, weighted average grant date fair value | $ 89.29 | $ 86.38 | $ 79.36

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