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Debt and Credit Facilities - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 10, 2019 | Jul. 01, 2014 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  | $ 500,000 |  | $ 500,000 |  |  |  |
Letters of credit outstanding amount |  |  | 186,600,000 |  | 186,600,000 |  |  | $ 197,300,000 |
Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  |  |  | $ 1,000,000.0 |  | $ 2,300,000 |  |  |
Repayment of outstanding balance | $ 150,000,000.0 |  |  |  |  |  |  |  |
Debt Amount |  |  |  |  |  |  |  |  | $ 150,000,000.0
Term Loan | Forecast |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount |  |  |  |  |  |  | $ 0 |  |
Level 2 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes, fair value |  |  | 272,200,000 |  | 272,200,000 |  |  |  |
Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest payable |  |  |  | 5,600,000 |  | 5,600,000 |  | 5,700,000 |
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest expense |  |  | 3,100,000 | 6,200,000 | 3,100,000 | 6,200,000 |  |  |
Debt instrument, outstanding amount |  |  | 250,000,000 |  | 250,000,000 |  |  | 250,000,000 |
Interest payments |  |  | 0 | 6,200,000 | 0 | 6,200,000 |  |  |
Private Placement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  | 1,100,000 |  | $ 1,100,000 |  |  |  |
Repayment of outstanding balance |  | $ 250,000,000.0 |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amended and restated credit agreement date |  |  |  |  | Nov. 30, 2017 |  |  |  |
Debt issuance costs incurred |  |  | 2,000,000.0 |  | $ 2,000,000.0 |  |  |  |
Revolving credit facility |  |  | 500,000,000 |  | 500,000,000 |  |  |  |
Increase in revolving credit facility |  |  | 550,000,000 |  | $ 550,000,000 |  |  |  |
Credit agreement extended date |  |  |  |  | Nov. 30, 2022 |  |  |  |
Letters of credit outstanding amount |  |  | 44,900,000 |  | $ 44,900,000 |  |  | $ 43,700,000 |
Interest expense |  |  | 300,000 | $ 1,600,000 | 400,000 | $ 5,000,000.0 |  |  |
Debt instrument, outstanding amount |  |  | $ 0 |  | $ 0 |  |  |  |
Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 1.42% |  | 1.42% |  |  |  |
Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 3.02% |
Credit Agreement | Base Rate | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  | 0.125% |  |  |  |
Credit Agreement | Base Rate | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  | 1.00% |  |  |  |
Credit Agreement | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  | 1.125% |  |  |  |
Credit Agreement | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Margin interest rate |  |  |  |  | 2.00% |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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