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Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt satisfaction gains (charges), net		$ 21,452,000	$ (4,517,000)	$ (2,596,000)
Senior Notes Due 2023 and 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Prepayment of costs and fees	$ 9,531,000
Extinguishment of debt, accrued interest	1,024,000
Debt satisfaction gains (charges), net	10,119,000
Senior Notes Due 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Extinguishment of debt	61,244,000
Senior Notes Due 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Extinguishment of debt	$ 51,068,000
Senior Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount		787,688,000	500,000,000
Debt instrument, unamortized discount		3,491,000	963,000
Senior Notes | Senior Notes Due 2030
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount		$ 400,000,000	0
Interest Rate		2.70%
Issue price		99.233%
Debt instrument, unamortized discount		$ 3,068,000
Senior Notes | Senior Notes Due 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount		$ 188,756,000	250,000,000
Interest Rate		4.25%
Issue price		99.026%
Senior Notes | Senior Notes Due 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount		$ 198,932,000	250,000,000
Interest Rate		4.40%
Issue price		99.883%
6.804% Trust Preferred Securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face amount					$ 200,000,000
Interest Rate		1.914%			6.804%
Principal amount outstanding on Trust Preferred Securities		$ 129,120,000	129,120,000
Debt issuance costs, gross		$ 1,625,000	$ 1,724,000
6.804% Trust Preferred Securities | London Interbank Offered Rate (LIBOR)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate					1.70%

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