Debt (Narrative) (Details)				3 Months Ended
	Sep. 16, 2021	Oct. 07, 2020 USD ($) fiscalQuarterPeriod	Nov. 15, 2019 USD ($) tradingDay	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Apr. 07, 2021 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 1,220,000	$ 0
Unamortized discount				3,809,000			$ 91,593,000
Deferred issuance costs				9,913,000			9,056,000
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
Long-term line of credit				0			0
4.625% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		4.625%
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
Extinguishment of debt, principle amount				54,600,000
Cash tender offer (maximum)				55,400,000
Loss on extinguishment of debt				1,200,000
Fair value of debt instruments				$ 559,700,000			659,900,000
Debt instrument, face amount		$ 750,000,000
Proceeds from debt, net of issuance costs		$ 742,700,000
4.625% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Percentage of principal amount redeemed		40.00%
Redemption price, percentage		104.625%
4.625% Senior Notes | Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price, percentage		100.00%
1.75% Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Stated interest rate			1.75%			1.75%
Convertible debt conversion ratio				0.0079864
Preferred Stock, Convertible, Conversion Ratio				0.0093783
Fair value of debt instruments				$ 627,000,000			$ 685,400,000
Debt instrument, face amount			$ 550,000,000
Proceeds from debt, net of issuance costs			537,100,000
Convertible debt conversion price (in usd per share) | $ / shares				$ 106.63
Gross debt issuance costs			12,900,000
Accumulated amortization of debt issuance costs			10,100,000
Deferred issuance costs			$ 2,800,000
Unamortized debt issuance expense				$ 8,700,000
1.75% Convertible Notes | Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Unamortized discount						$ 87,300,000
1.75% Convertible Notes | Convertible Debt | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Convertible debt threshold trading days | tradingDay			20
Convertible debt threshold consecutive trading days | tradingDay			30
Percentage of stock price			130.00%
1.75% Convertible Notes | Convertible Debt | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Convertible debt threshold trading days | tradingDay			5
Convertible debt threshold consecutive trading days | tradingDay			10
Percentage of product of stock price and conversion rate			98.00%
6.0% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		6.00%
Bridge Loan Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				0.50%
Bridge Loan Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				1.25%
Bridge Loan Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Bridge Loan Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Bridge Loan Facility | Bridge Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Calculation denominator	1.00
Bridge Loan Facility | Bridge Loan | Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%