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Long-Term Debt (Narrative) (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 12, 2019 | Oct. 31, 2018 | Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  |  | $ 1,899,000 | $ 2,452,000
Credit Agreement [Member] | Capital One, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum aggregate loan amount available |  | $ 269,600,000 | 219,000,000.0 | 191,400,000
Debt instrument, maturity date |  | May 08, 2023 |  |
Debt instrument total net leverage ratio |  | 4.25% |  |
Debt issuance costs |  | $ 900,000 |  |
Line of credit outstanding amount |  |  | 9,300,000 | 10,000,000.0
Credit Agreement [Member] | Capital One, National Association [Member] | Delayed Draw Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum aggregate loan amount available |  | $ 19,600,000 |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit outstanding amount |  |  | $ 18,400,000 | $ 18,900,000
Debt instrument stated interest rate |  |  | 1.89% | 3.45%
Credit Agreement [Member] | Capital One, National Association [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument total net leverage ratio |  | 3.75% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Federal Funds Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 0.50% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 1.00% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | London Interbank Offered Rate (LIBOR) | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 0.00% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Based On Applicable Senior Leverage Ratio | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 0.75% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Based On Applicable Senior Leverage Ratio | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 1.50% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Based On Applicable Leverage Ratio [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 1.75% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Based On Applicable Leverage Ratio [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument variable interest rate margin |  | 2.50% |  |
Credit Agreement [Member] | Capital One, National Association [Member] | Restriction on Dividends [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate amount of dividends and distributions | $ 7,500,000 |  |  |
Credit Agreement [Member] | Revolving Credit Loan [Member] | Capital One, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum aggregate loan amount available | 300,000,000.0 | $ 250,000,000.0 |  |
Increase in credit facility | 50,000,000.0 |  |  |
Debt issuance costs | $ 400,000 |  |  |
Proceeds from line of credit |  |  | $ 0 |
Line of credit outstanding amount |  |  | $ 43,400,000 | $ 43,400,000
Debt instrument stated interest rate |  |  | 1.89% | 3.44%
Credit Agreement [Member] | Revolving Credit Loan [Member] | Capital One, National Association [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fee charged on unused portion of revolving credit facility | 0.20% |  |  |
Credit Agreement [Member] | Revolving Credit Loan [Member] | Capital One, National Association [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fee charged on unused portion of revolving credit facility | 0.35% |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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