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Debt, Commitments and Contingencies - 2017 Facility (Details) - USD ($) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 20, 2021 | Mar. 25, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Oct. 06, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from credit facility |  |  | $ 0 | $ 50,000,000 |  |
Repayments of lines of credit |  |  | 110,000,000 | 1,000,000 |  |
Loss on early extinguishment of debt |  |  | 185,000 | $ 0 |  |
Revolving Credit Facility | 2017 Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from credit facility |  | $ 50,000,000.0 |  |  |  |
Repayments of lines of credit | $ 110,000,000.0 |  |  |  |  |
Loss on early extinguishment of debt |  |  | 200,000 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current borrowing capacity |  |  |  |  |  | $ 125,000,000.0
Long-term debt | $ 110,000,000.0 |  | $ 0 |  | $ 110,000,000.0 | 72,000,000.0
Maximum borrowing capacity |  |  |  |  |  | $ 175,000,000.0
Unused line commitment fee (percentage) |  |  | 0.20% |  |  |
Effective interest rate (percent) |  |  |  | 3.42% |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | Federal Funds Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.50% |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.00% |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario One, Leverage Ratio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate terms, leverage ratio |  |  | 1.00 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Two, Leverage Ratio | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate terms, leverage ratio |  |  | 1.00 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Two, Leverage Ratio | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate terms, leverage ratio |  |  | 2.00 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Three, Leverage Ratio | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate terms, leverage ratio |  |  | 2.00 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Three, Leverage Ratio | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate terms, leverage ratio |  |  | 3.00 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Four, Leverage Ratio | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate terms, leverage ratio |  |  | 3.00 |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Less than 1.00 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.50% |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Greater than or equal to 1.00 but less than 2.00 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.75% |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Greater Than Or Equal To 2.00 But Less Than 3.00 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 2.00% |  |  |
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Greater Than Or Equal To 3.00 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 2.50% |  |  |

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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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