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Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) Item Segment shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of operating segments | Segment | 3 |  |
Aggregate market cap | $ 34,465.34 |  |
Contract with customer liability | 1,700,000 | $ 800,000 |
Operating lease asset, impairment | 4,968,000 | 13,000 | $ 1,174,000
Exit charges | 2,200,000 |  |
Goodwill impairment charge | 0 | 0 | 0
Goodwill | 970,558,000 | 662,995,000 | 582,837,000
Impairment of finite-lived intangible assets | 0 | 0 | 0
Intangibles, net of accumulated amortization | 109,643,000 | 91,983,000 |
Deductible component of workers' compensation | 400,000 |  |
Accrued workers’ compensation insurance | 13,644,000 | 12,043,000 |
Workers' compensation insurance recovery receivables | $ 810,000 | 577,000 |
Number of stock incentive plans | Item | 1 |  |
Stock-based compensation expense | $ 11,165,000 | 10,319,000 | $ 10,625,000
Credit Agreement [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Line of credit outstanding amount | 577,700,000 | 470,000,000 |
Credit Agreement [Member] | Capital One, National Association [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Line of credit outstanding amount | $ 8,000,000 | $ 8,000,000 |
Employee Stock Option |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of stock options included in calculation | shares | 406,000 | 455,000 | 468,000
Number of dilutive shares outstanding | shares | 259,000 | 234,000 | 248,000
Restricted Stock [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of dilutive shares outstanding | shares | 115,000 | 82,000 | 72,000
Shares of restricted stock awards included in calculation | shares | 244,000 | 201,000 | 210,000
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Leases termination and renewal option | 1 year |  |
Intangible assets, estimated useful lives | 1 year |  |
Minimum [Member] | Customer and Referral Relationships [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, estimated useful lives | 5 years |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Leases termination and renewal option | 5 years |  |
Intangible assets, estimated useful lives | 25 years |  |
Maximum [Member] | Customer and Referral Relationships [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, estimated useful lives | 10 years |  |
General and Administrative Expenses [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Operating lease asset, impairment | $ 5,000,000 | $ 13,000 | $ 1,200,000
Accounting Standard Update 2014-09 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Accounts receivable, allowance for credit losses | $ 3,500,000 | $ 2,300,000 |
Accounting Standards Update 2021-08 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2023 |  |
Accounting Standard Update 2020-04 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2023 |  |

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