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Convertible Senior Notes, Net - Summary of Note Terms (Details) - Convertible Debt	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Principal Amount	$ 575,000,000
Conversion rate basis, principal amount	$ 1,000,000
2022 Notes
Debt Instrument [Line Items]
Principal Amount				$ 345,000,000
Coupon Rate				4.75%
Effective Rate				5.60%
Conversion Rate				0.0502260
Remaining Period of Amortization				2 years 4 months 24 days
2023 Notes
Debt Instrument [Line Items]
Principal Amount		$ 230,000,000.0	$ 230,000,000.0
Coupon Rate		5.375%	5.375%
Effective Rate		6.16%	6.16%
Conversion Rate		0.0487187
Remaining Period of Amortization			3 years 6 months 14 days

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