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v3.21.1

Debt and Credit Facilities - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) d $ / shares shares | Mar. 31, 2021 USD ($) d $ / shares shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2021 USD ($) | Aug. 10, 2020 USD ($) | Jul. 01, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding amount |  | $ 203,900,000 |  | $ 193,100,000 |  |  |
Deferred tax liabilities |  | 13,146,000 |  | 12,285,000 |  |  |
Deferred tax assets |  | 143,022,000 |  | 130,200,000 |  |  |
Level 2 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, fair value |  | 270,500,000 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, outstanding amount |  | 200,000,000 |  | 200,000,000 |  |  |
Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 0.25% |  |  |  |  |  |
Interest expense |  | $ 600,000 |  | 4,400,000 |  |  |
Debt amount | $ 400,000,000.0 |  |  |  |  |  |
Exercise of option by initial purchasers aggregate principal amount | 50,000,000.0 |  |  |  |  |  |
Proceeds from issuance and sale of debt | 389,700,000 |  |  |  |  |  |
Transaction fees and other third-party offering expenses | $ 10,300,000 |  |  |  |  |  |
Debt instrument, payment terms |  | The Convertible Senior Notes accrue interest at a rate of 0.25% per annum, payable semi-annually on February 15 and August 15 of each year beginning on February 15, 2021 |  |  |  |  |
Debt instrument, frequency of periodic payment |  | semi-annually |  |  |  |  |
Maturity Date | Aug. 15, 2025 |  |  |  |  |  |
Convertible note converted each amount |  | $ 1,000 |  |  |  |  |
Convertible notes converted each into shares of common stock | shares |  | 22.2913 |  |  |  |  |
Debt Instrument, conversion price | $ / shares |  | $ 44.86 |  |  |  |  |
Threshold trading days | d | 20 | 51 |  |  |  |  |
Threshold consecutive trading days | d | 30 |  |  |  |  |  |
Conversion percentage of stock price trigger | 130.00% |  |  |  |  |  |
Number of business day period | 5 days |  |  |  |  |  |
Consecutive trading day period | 5 days |  |  |  |  |  |
Convertible principal amount | $ 1,000 |  |  |  |  |  |
Measurement period, percentage | 98.00% |  |  |  |  |  |
Percentage of principal amount to redeem convertible senior notes | 100.00% |  |  |  |  |  |
Percentage of convertible senior notes repurchased at cash | 100.00% |  |  |  |  |  |
Debt liability | $ 336,100,000 |  |  |  |  |  |
Debt instrument convertible notes additional paid in capital | $ 53,600,000 |  |  |  |  |  |
Convertible senior notes effective interest rate | 3.25% |  |  |  |  |  |
Net carrying value of notes |  | $ 400,000,000.0 |  | 340,600,000 |  |  |
Bond hedge term |  | 5 years |  |  |  |  |
Number of shares issuable upon conversion | shares | 8,900,000 |  |  |  |  |  |
Cost of convertible note hedge transaction | $ 55,000,000.0 |  |  |  |  |  |
Number of common stock acquired by offsetting sale warrants. | shares |  | 8,900,000 |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 66.46 |  |  |  |  |
Cash proceeds from sales of warrants |  | $ 13,800,000 |  |  |  |  |
Convertible Senior Notes | ASU 2020-06 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Reclassification of equity component of convertible senior notes to liabilities |  | 55,000,000.0 |  |  |  |  |
Reclassification of equity component of debt issuance costs to liabilities |  | 1,400,000 |  |  |  |  |
Carrying amount of convertible senior notes adjusted in retained earnings |  |  |  |  | $ 3,700,000 |  |
Convertible Note Hedge And Warrant Transaction |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Purchase of bond hedges and sale of warrants | $ 41,200,000 |  |  |  |  |  |
Deferred tax liabilities |  | 16,200,000 |  |  |  |  |
Deferred tax assets |  | 16,500,000 |  |  |  |  |
Convertible Note Hedge And Warrant Transaction | ASU 2020-06 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Deferred tax liability reversed |  | 13,900,000 |  |  |  |  |
Additional deferred tax liability related to capitalized debt issuance costs |  | 400,000 |  |  |  |  |
Adjustment to deferred tax asset through retained earnings |  | 900,000 |  |  |  |  |
Private Placement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  |  | $ 500,000 | $ 1,100,000
Debt amount |  |  |  |  |  |  | $ 250,000,000.0
Private Placement | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest payable |  | 2,400,000 |  | $ 2,600,000 |  |  |
Private Placement | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest expense |  | 3,200,000 | $ 3,200,000 |  |  |  |
Interest payments |  | $ 6,200,000 | 6,200,000 |  |  |  |
Minimum | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, conversion price | $ / shares | $ 44.86 |  |  |  |  |  |
Percentage of bond hedge and warrant transactions increased conversion price | 35.00% |  |  |  |  |  |
Maximum | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, conversion price | $ / shares | $ 66.46 |  |  |  |  |  |
Percentage of bond hedge and warrant transactions increased conversion price | 100.00% |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amended and restated credit agreement date |  | Nov. 30, 2017 |  |  |  |  |
Debt issuance costs incurred |  | $ 2,000,000.0 |  |  |  |  |
Revolving credit facility |  | 500,000,000 |  |  |  |  |
Increase in revolving credit facility |  | $ 550,000,000 |  |  |  |  |
Credit agreement extended date |  | Nov. 30, 2022 |  |  |  |  |
Interest rate |  | 1.86% |  | 1.87% |  |  |
Letters of credit outstanding amount |  | $ 45,300,000 |  | $ 44,900,000 |  |  |
Interest expense |  | 100,000 | $ 300,000 |  |  |  |
Debt instrument, outstanding amount |  | $ 0 |  |  |  |  |
Revolving Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Margin interest rate |  | 0.125% |  |  |  |  |
Revolving Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Margin interest rate |  | 1.00% |  |  |  |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Margin interest rate |  | 1.125% |  |  |  |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Margin interest rate |  | 2.00% |  |  |  |  |

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