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Debt - Narrative (Details) - 6.25% senior convertible notes due 2022 - Convertible Notes	Jan. 23, 2017 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Face amount	$ 138,000,000.0
Interest rate	6.25%
Discount and deferred charges, net		$ 2,000,000.0	$ 2,700,000
Debt issuance cost, percentage	8.24%
Notes issued, percentage of principle	96.00%
Conversion ratio	0.1427144
Conversion price (in dollars per share) | $ / shares	$ 7.01

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