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Debt - Senior Notes (Details) - USD ($)				12 Months Ended
	Feb. 08, 2021	Jan. 13, 2021	Dec. 14, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 12, 2017	Oct. 18, 2016	May 24, 2016	Sep. 24, 2015
Debt Instrument [Line Items]
Deferred financing costs expense				$ 2,300,000	$ 0	$ 0
2026 Senior Notes
Debt Instrument [Line Items]
Senior notes, noncurrent									$ 600,000,000.0
Stated percentage				5.50%	5.50%				5.50%
Percentage of principal amount that may be redeemed				105.50%
Minimum percentage of notes not eligible for early redemption				65.00%
Senior notes, percent exchanged								100.00%
2026 Senior Notes | Any time on or after June 15, 2021
Debt Instrument [Line Items]
Redemption price, percentage				102.75%
2026 Senior Notes | Beginning on June 15, 2024
Debt Instrument [Line Items]
Redemption price, percentage				100.00%
2026 Senior Notes | Any time prior to June 15, 2021 with a 'make-whole' premium and accrued and unpaid interest, if any
Debt Instrument [Line Items]
Percentage of redemption on notes				100.00%
2026 Senior Notes | Any time prior to June 15, 2019 with the net cash proceeds from certain equity offerings plus accrued and unpaid interest, if any
Debt Instrument [Line Items]
Percentage of redemption on notes				35.00%
Securitized debt
Debt Instrument [Line Items]
Senior notes, noncurrent				$ 375,000,000.0
2023 Senior Notes
Debt Instrument [Line Items]
Senior notes, noncurrent										$ 450,000,000.0
Stated percentage				5.625%	5.625%					5.625%
Repayments of senior notes			$ 200,000,000.0	$ 200,000,000.0
Deferred financing costs expense				$ 2,300,000
2023 Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Senior notes, noncurrent		$ 250,000,000.0
Repayments of senior notes	$ 125,000,000.0	$ 125,000,000.0
2023 Senior Notes | Any time on or after October 15, 2018
Debt Instrument [Line Items]
Redemption price, percentage			101.406%	104.219%
2023 Senior Notes | Any time on or after October 15, 2018 | Subsequent Event
Debt Instrument [Line Items]
Redemption price, percentage	101.406%	101.406%
2023 Senior Notes | Beginning on October 15, 2021
Debt Instrument [Line Items]
Redemption price, percentage				100.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Principal borrowing capacity, maximum							$ 120,000,000.0

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