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Debt - Narrative (Details)		9 Months Ended
	Apr. 27, 2021 USD ($)	Sep. 30, 2021 USD ($) jointVenture $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of senior unsecured notes, net		$ 96,267,000	$ 0
Long-term debt		$ 486,786,000
Number of joint venture invested in during period | jointVenture		5
6.25% senior convertible notes due 2022 | Convertible Notes
Debt Instrument [Line Items]
Face amount		$ 138,000,000
Interest rate		6.25%
Discount and deferred charges, net		$ 800,000		$ 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
5.75% Senior Notes Due 2026 | Unsecured Debt
Debt Instrument [Line Items]
Face amount	$ 100,000,000
Interest rate	5.75%
Debt instrument, percentage of principal issued	100.00%
Proceeds from issuance of senior unsecured notes, net	$ 96,300,000
Long-term debt		$ 100,000,000
Deferred loan fees, net		$ 3,500,000
Debt issuance costs, amortization rate		6.64%
5.75% Senior Notes Due 2026 | Unsecured Debt | Between BB+ and B+ Credit Rating
Debt Instrument [Line Items]
Interest rate increase	0.50%
5.75% Senior Notes Due 2026 | Unsecured Debt | B+ or Below Credit Rating
Debt Instrument [Line Items]
Interest rate increase	0.75%
5.75% Senior Notes Due 2026 | Unsecured Debt | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
5.75% Senior Notes Due 2026 | Unsecured Debt | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Debt instrument, redemption price, percentage multiplyer	2.875%

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