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Long-Term Debt Long-Term Debt (Narrative) (Details) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 USD ($) | May 13, 2021 USD ($) | Sep. 29, 2020 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2021 USD ($) letter_of_credit | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 22, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Present value of future deferred payments |  |  | $ 2,100,000 |  |  |  |  |
Debt Instrument, Debt Compliance, EBITDA |  |  |  |  | 0.50 |  |  |
Letters of Credit | letter_of_credit |  |  |  |  | 1 |  |  |
Debt instrument, term |  |  |  |  | 89 months |  |  |
Amortization of debt issuance costs |  |  |  |  | $ 576,000 | $ 782,000 | $ 392,000 |
Debt Issuance Costs, Gross |  | $ 800,000 |  |  |  |  |  |
Line Of Credit Facility Accordion Provision |  |  |  |  | 75,000,000 | 75,000,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | (23,807,000) | (6,000) | 0 |
Debt Issuance Costs, Net |  |  |  |  | 1,543,000 | 1,136,000 |  |
Deferred Purchase Price Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 364,000 | 489,000 | 622,000 |
Deferred Purchase Price Notes | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent) |  |  |  |  | 7.30% |  |  |
Debt instrument, term |  |  |  |  | 5 years |  |  |
Deferred Purchase Price Notes | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent) |  |  |  |  | 10.00% |  |  |
Debt instrument, term |  |  |  |  | 20 years |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 155,400,000 |  |  |
Interest expense |  |  |  |  | $ 1,820,000 | 3,738,000 | 1,601,000 |
Amortization of debt issuance costs |  |  |  |  |  |  | 229,000 |
Gain (Loss) on Extinguishment of Debt |  | 100,000 |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 190,000,000 |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 15,000,000.0 |  |
Swingline [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 10,000,000.0 |  |
Loans Payable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  | 482,000 | $ 380,000 |
Credit Agreement Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 200,000,000
Debt Issuance Costs, Net |  |  |  |  |  |  |  | $ 100,000
New Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 150,000,000 |  |  |  |  |  |
Revolving Credit Facility, Secured, Floating Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Present value of future deferred payments | $ 2,300,000 |  |  | $ 2,100,000 |  |  |  |
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | Prime Rate Option |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate (in percent) |  |  |  |  | 0.75% |  |  |
Revolving Credit Facility, Secured, Floating Rate | Line of Credit | LIBOR Margin Option |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate (in percent) |  |  |  |  | 1.75% |  |  |
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 155,400,000 | $ 47,200,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 21,400,000 |  |  | $ 42,300,000 |  |  |
Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Credit Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  |  | 2.40% | 3.80% |  |
Ratio Actual [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital (in ratio) |  |  |  |  | 5.00 |  |  |
Ratio Actual [Member] | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital (in ratio) |  |  |  |  | 0.25 |  |  |
Ratio Actual [Member] | Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ratio of earnings to fixed cost obligations (in ratio) |  |  |  |  | 1.20 |  |  |

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