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Debt (Narrative) (Details) |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2021 USD ($) shares | Jun. 02, 2021 USD ($) extension | Oct. 07, 2020 USD ($) fiscalQuarterPeriod | Nov. 15, 2019 USD ($) tradingDay | Jun. 10, 2014 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Apr. 07, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of debt instruments |  |  |  |  |  | $ 2,300,000,000 | $ 2,300,000,000 |  |  | $ 2,000,000,000.0
Repayments of long-term debt |  |  |  |  |  |  | 2,802,000 | $ 0 |  |
Deferred issuance costs |  |  |  |  |  | 10,158,000 | 10,158,000 |  |  | 11,505,000
Long-term debt |  |  |  |  |  | $ 1,591,861,000 | $ 1,591,861,000 |  |  | 1,579,021,000
Common stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise of 3.25% Convertible Note (in shares) | shares |  |  |  |  |  | 19,033 | 19,033 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 100,000,000 |
Increase available |  |  |  |  |  |  |  |  | 250,000,000 |
Total aggregate commitment |  |  |  |  |  |  |  |  | $ 350,000,000 |
Bridge Loan Facility | Bridge Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 405,000,000 |  |  |  |  |  |  |  |
Term |  | 364 days |  |  |  |  |  |  |  |
Number of extensions | extension |  | 2 |  |  |  |  |  |  |  |
Extension period |  | 3 months |  |  |  |  |  |  |  |
Funding fee percentage |  | 0.50% |  |  |  |  |  |  |  |
Duration fee percentage |  | 0.25% |  |  |  |  |  |  |  |
Anniversary fee percentage |  | 0.50% |  |  |  |  |  |  |  |
Bridge Loan Facility | Bridge Loan | Base Rate | Initial Funding |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |
Bridge Loan Facility | Bridge Loan | Base Rate | Six To Twelve Months After Funding |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.50% |  |  |  |  |  |  |  |
Bridge Loan Facility | Bridge Loan | Base Rate | Twelve Months After Funding Until Repayment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% |  |  |  |  |  |  |  |
Bridge Loan Facility | Bridge Loan | LIBOR | Initial Funding |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% |  |  |  |  |  |  |  |
Bridge Loan Facility | Bridge Loan | LIBOR | Six To Twelve Months After Funding |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.50% |  |  |  |  |  |  |  |
Bridge Loan Facility | Bridge Loan | LIBOR | Twelve Months After Funding Until Repayment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.00% |  |  |  |  |  |  |  |
Senior Notes | 4.625% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.625% |  |  |  |  |  |  |
Face amount |  |  | $ 750,000,000 |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  | $ 742,700,000 |  |  |  |  |  |  |
Percentage principal outstanding to be eligible for redemption |  |  | 50.00% |  |  |  |  |  |  |
Covenant, leverage ratio, minimum |  |  | 3.5 |  |  |  |  |  |  |
Covenant restricted payment threshold |  |  | $ 250,000,000 |  |  |  |  |  |  |
Covenant, EBITDA minimum |  |  | 50.00% |  |  |  |  |  |  |
Covenant, EBITDA minimum, fiscal quarter period | fiscalQuarterPeriod |  |  | 4 |  |  |  |  |  |  |
Fair value of debt instruments |  |  |  |  |  | $ 778,400,000 | $ 778,400,000 |  |  | 796,900,000
Outstanding debt originating from the Paycheck Protection Program |  |  |  |  |  | 750,000,000 | 750,000,000 |  |  | 750,000,000
Senior Notes | 4.625% Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  | 104.625% |  |  |  |  |  |  |
Percentage of principal amount redeemed |  |  | 40.00% |  |  |  |  |  |  |
Senior Notes | 4.625% Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  | 100.00% |  |  |  |  |  |  |
Senior Notes | 6.0% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 6.00% |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding debt originating from the Paycheck Protection Program |  |  |  |  |  | 1,699,613,000 | 1,699,613,000 |  |  | 1,702,414,000
Convertible Debt | 3.25% Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.25% |  |  |  |  |
Face amount |  |  |  |  | $ 402,500,000 |  |  |  |  |
Fair value of debt instruments |  |  |  |  |  | $ 815,100,000 | $ 815,100,000 |  |  | 593,100,000
Contingent interest period |  |  |  |  | 6 months |  |  |  |  |
Trading period |  |  |  |  | 5 days |  |  |  |  |
Contingent interest, minimum trading price per principal amount |  |  |  |  | $ 1,300 |  |  |  |  |
Convertible debt conversion ratio |  |  |  |  |  |  | 0.0147632 |  |  |
Convertible debt conversion price (in usd per share) | $ / shares |  |  |  |  |  | $ 67.74 | $ 67.74 |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 2,800,000 |  |  |  |
Outstanding debt originating from the Paycheck Protection Program |  |  |  |  |  | 399,613,000 | $ 399,613,000 |  |  | 402,414,000
Convertible Debt | 3.25% Convertible Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 399,600,000 |  |  |  |  |  |  |  |  |
Exercise of 3.25% Convertible Note (in shares) | shares | 3,031,817 |  |  |  |  |  |  |  |  |
Convertible Debt | 1.75% Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 1.75% |  |  |  |  |  |
Face amount |  |  |  | $ 550,000,000.0 |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 537,100,000 |  |  |  |  |  |
Fair value of debt instruments |  |  |  |  |  | $ 706,400,000 | $ 706,400,000 |  |  | 569,700,000
Convertible debt conversion ratio |  |  |  |  |  |  | 0.0079864 |  |  |
Convertible debt conversion price (in usd per share) | $ / shares |  |  |  |  |  | $ 125.21 | $ 125.21 |  |  |
Borrowing rates of similar debt without the conversion feature |  |  |  | 5.50% |  |  |  |  |  |
Unamortized discount |  |  |  | $ 118,900,000 |  |  |  |  |  |
Effective interest rate |  |  |  | 5.50% |  |  |  |  |  |
Convertible debt carrying amount of equity component |  |  |  | $ 88,100,000 |  |  |  |  |  |
Convertible debt remaining discount amortization period |  |  |  |  |  |  | 5 years 3 months 18 days |  |  |
Unamortized debt issuance expense |  |  |  |  |  | $ 8,300,000 | $ 8,300,000 |  |  |
Gross debt issuance costs |  |  |  | 12,900,000 |  |  |  |  |  |
Accumulated amortization of debt issuance costs |  |  |  | 10,100,000 |  |  |  |  |  |
Deferred issuance costs |  |  |  | $ 2,800,000 |  |  |  |  |  |
Outstanding debt originating from the Paycheck Protection Program |  |  |  |  |  | 550,000,000 | 550,000,000 |  |  | 550,000,000
Convertible Debt | 1.75% Convertible Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible debt threshold trading days | tradingDay |  |  |  | 20 |  |  |  |  |  |
Convertible debt threshold consecutive trading days | tradingDay |  |  |  | 30 |  |  |  |  |  |
Convertible debt conversion ratio |  |  |  | 1.30 |  |  |  |  |  |
Convertible Debt | 1.75% Convertible Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible debt threshold trading days | tradingDay |  |  |  | 5 |  |  |  |  |  |
Convertible debt threshold consecutive trading days | tradingDay |  |  |  | 10 |  |  |  |  |  |
Convertible debt conversion ratio |  |  |  | 0.98 |  |  |  |  |  |
Loans Payable | Paycheck Protection Program, CARES Act |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding debt originating from the Paycheck Protection Program |  |  |  |  |  | $ 0 | $ 0 |  |  | $ 910,000

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