Notes Payable and Amounts Due Under Repurchase Agreements (Schedule of Notes Payable) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jun. 16, 2017
Debt Instrument [Line Items]
Notes payable	$ 495,668	$ 495,116
June 2027 Notes
Debt Instrument [Line Items]
Debt instrument, face amount	500,000	500,000	$ 500,000
Unamortized debt issue costs	(4,086)	(4,607)
Unamortized discount	$ (246)	$ (277)	$ (300)

Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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