Line of Credit and Long-Term Debt - Convertible Senior Subordinated Notes (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 12, 2019 USD ($) D $ / shares	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Lines of Credit and Long-Term Debt
Accrued interest payable		$ 711		$ 711		$ 2,281
Cash paid for interest				7,204	$ 8,169
Long term debt, net		320,297		320,297		$ 319,299
2026 Notes, Convertible Senior Subordinated Notes
Lines of Credit and Long-Term Debt
Aggregate borrowings	$ 325,000	$ 325,000		$ 325,000
Interest rate (as a percent)	1.75%	1.75%		1.75%
Initial conversion rate	0.0142966
Initial conversion price (in dollars per share) | $ / shares	$ 69.95
Principal amount	$ 1
Debt issuance costs	$ 9,372
Effective interest rate		2.20%		2.20%
Interest expense		$ 1,757	$ 1,750	$ 5,265	5,243
Paid or accrued interest		1,422	1,423	4,266	4,266
Non-cash accretion of discounts		335	327	999	977
Amount of additional interest payable			$ 212		$ 212
Accrued interest payable		711		711
Long term debt, net		$ 320,297		$ 320,297
2026 Notes, Convertible Senior Subordinated Notes | Debt Conversion Scenario One
Lines of Credit and Long-Term Debt
Trading days | D	20
Consecutive trading days | D	30
Stock price trigger percentage (as a percent)	130.00%
2026 Notes, Convertible Senior Subordinated Notes | Debt Conversion Scenario Two
Lines of Credit and Long-Term Debt
Trading days | D	5
Consecutive trading days | D	5
Principal amount	$ 1
Stock price trigger percentage (as a percent)	98.00%