Long-Term Debt Long-Term Debt (Senior long-term debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Accumulated Amortization, Debt Issuance Costs	$ 819	$ 337
Debt Issuance Costs, Net	1,136	1,618
Less: current portion	(1,027)	(1,306)
Total acquisition debt, net of current portion	4,482	5,658
Notes payable, other \| Acquisition Debt
Debt Instrument [Line Items]
Principal amount	5,509	6,964
Credit Agreement [Member]
Debt Instrument [Line Items]
Principal amount	47,200
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Present value of Credit Facility and acquisition debt	47,200
Credit Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Principal amount	46,064	82,182
Acquisition Debt
Debt Instrument [Line Items]
Principal amount	7,912
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	1,386
Less: Interest	2,403
Present value of Credit Facility and acquisition debt	5,509
Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility, Secured, Floating Rate
Debt Instrument [Line Items]
Principal amount	$ 47,200	$ 83,800

Long-term debt, Present Value

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Long-term debt, Undiscounted Excess Amount

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Amount of accumulated amortization of debt issuance costs.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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