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Debt - Narrative (Details) - 6.25% senior convertible notes due 2022 - Convertible Notes	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Jan. 23, 2017
Debt Instrument [Line Items]
Face amount	$ 138,000,000.0
Interest rate	6.25%		6.25%
Discount and deferred charges, net	$ 2,700,000	$ 5,000,000.0
Cost of debt, percentage	8.24%
Effective interest rate	96.00%
Convertible note, conversion ratio	0.1427144
Conversion price (in dollars per share) | $ / shares	$ 7.01

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