Long-Term Debt - Senior Notes (Details) - Senior notes	12 Months Ended
	Dec. 31, 2020
Minimum
Debt Instrument [Line Items]
Redemption period	10 days
Maximum
Debt Instrument [Line Items]
Redemption period	60 days
Senior Notes 2025 and Senior Notes 2026 | Minimum
Debt Instrument [Line Items]
Redemption period	30 days
Senior Notes 2025 and Senior Notes 2026 | Maximum
Debt Instrument [Line Items]
Redemption period	60 days