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Long Term Debt - Senior Notes, Capped Call Transaction and Interest Expense (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2020 USD ($) d $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2016 USD ($)
Debt Instrument [Line Items]
Repayment of credit facility	$ 439,900,000
Interest expense, net		$ (14,955,000)	$ (5,655,000)	$ (32,251,000)	$ (15,881,000)
1.50% Convertible Senior Notes
Debt Instrument [Line Items]
Stated interest rate, percentage	1.50%
Aggregate principal	$ 500,000,000.0
Proceeds from debt offering	488,800,000
Payment of cap call transaction	$ 47,900,000
Initial conversion rate	0.1018589
Debt conversion price (in usd per share) | $ / shares	$ 9.82
Trading days (whether or not consecutive) | d	20
Consecutive trading days | d	30
Percentage of stock price	130.00%
Business period	5 days
Measurement period	5 days
Measurement period, percentage	98.00%
Redemption price, percentage of principal repurchased	100.00%
Cap call transaction cap price per share (in usd per share) | $ / shares	$ 13.4750
Premium over last reported sale price, percentage	75.00%
Deferred financing costs	$ 10,100,000	$ 9,123,000	$ 0	$ 9,123,000	$ 0
Effective interest rate,percentage		6.80%		6.80%
Deferred tax liability, net	11,000,000.0
Decrease in valuation allowance	11,000,000.0
1.50% Convertible Senior Notes | Additional Paid-in-Capital
Debt Instrument [Line Items]
Deferred financing costs	2,200,000
1.50% Convertible Senior Notes | Senior Notes
Debt Instrument [Line Items]
Deferred financing costs	$ 12,300,000
3.250% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Stated interest rate, percentage		3.25%		3.25%		3.25%
Aggregate principal						$ 600,000,000.0
Deferred financing costs						$ 5,300,000

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