Financial Instruments - Carrying Amounts and Estimated Fair Values of Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2023 notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net Carrying Amount	$ 23,280	$ 22,482
Estimated Fair Value	34,487	59,894
2025 notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net Carrying Amount	650,783	488,268
Estimated Fair Value	593,366	802,083
2027 notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net Carrying Amount	563,234	0
Estimated Fair Value	$ 467,814	$ 0