Significant Accounting Policies - Recent Accounting Pronouncements Not Yet Adopted (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Changes
Long-term debt		$ 229,438	$ 321,115
Stockholders' equity		437,628	$ 408,374	$ 374,512	$ 437,775
ASU 2020-06: Debt
Accounting Changes
Change in Accounting Principle, Accounting Standards Update, Adopted	true
ASU 2020-06: Debt | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma
Accounting Changes
Long-term debt		44,300
Stockholders' equity		$ (44,300)