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Debt - Convertible Notes (Details) - Convertible debt - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Aug. 31, 2015
3.00% Convertible senior notes due 2022
Long-term debt
Principal	$ 150,000,000	$ 150,000,000	$ 150,000,000.0
Less: Debt issuance costs	(1,104,000)	(1,329,000)
Less: Debt discount, net	(22,166,000)	(26,686,000)
Net carrying amount	126,730,000	121,985,000
1.50% Convertible senior notes due 2026
Long-term debt
Principal	287,500,000	287,500,000
Less: Debt issuance costs	(4,319,000)	(4,567,000)
Less: Debt discount, net	(112,877,000)	(119,350,000)
Net carrying amount	$ 170,304,000	$ 163,583,000

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