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Convertible Senior Notes, Net - Summary of Note Terms (Details) - Convertible Debt		6 Months Ended	12 Months Ended
	Oct. 05, 2018 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)
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			$ 345,000,000.0
Coupon Rate			4.75%
Effective Rate			5.60%
Conversion Rate		0.0502260
Remaining Period of Amortization			3 years 1 month 24 days
2023 Notes
Debt Instrument [Line Items]
Principal Amount	$ 230,000,000			$ 230,000,000.0
Coupon Rate	5.375%
Effective Rate	6.16%
Conversion Rate		0.0487187
Remaining Period of Amortization	4 years 3 months 14 days

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