Long-Term Debt - Convertible Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Proceeds from Issuance of Warrants	$ 12,376,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		$ 17,243,000	$ 16,909,000	$ 15,042,000
Long-term debt		$ 308,129,000	245,053,000
Convertible Senior Notes at 5.00% February 2024 | Convertible Subordinated Debt
Debt Disclosure [Abstract]
Initial conversion price		$ 14.78
Debt Instrument [Line Items]
Interest rate (as a percent)		5.00%
Debt Instrument, Face Amount		$ 72,909,000	72,909,000
Effective Interest Rate		8.77%
Unamortized discount		$ 0	(8,888,000)
Long-term debt		72,140,000	62,984,000
Debt Instrument, Non-Cash Interest Expense Recognized in the Period		0	1,845,000
Debt Instrument, Increase, Accrued Interest		3,645,000	3,646,000
Debt Instrument, Fee Amount, Net Balance Shown as a Liability		(769,000)	(1,037,000)
Debt Instrument, Net Carrying Amount		$ 72,140,000	62,984,000
Convertible Senior Notes at 5.00% February 2021 | Convertible Subordinated Debt
Debt Instrument [Line Items]
Interest rate (as a percent)		5.00%
Debt Instrument, Face Amount	$ 150,000,000	$ 1,250,000	1,250,000
Effective Interest Rate		11.10%
Unamortized discount		$ 0	(7,000)
Long-term debt		0	1,242,000
Convertible due 2021 - Bond Hedge, Fair Value at Issuance		27,975,000
Debt Instrument, Non-Cash Interest Expense Recognized in the Period		0	1,782,000
Debt Instrument, Increase, Accrued Interest		8,000	1,632,000
Debt Instrument, Fee Amount, Net Balance Shown as a Liability		0	(1,000)
Debt Instrument, Net Carrying Amount		$ 0	$ 1,242,000