Fair Value Measurement (Financial Disclosures About Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	$ 86,034	$ 98,134
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	348,045	356,604
Restricted cash	25,459	50,266
Notes receivable, net	404,232	448,568
Receivable-backed notes payable	399,805	422,815
Notes payable and other borrowings	223,428	188,731
Junior subordinated debentures	137,703
Redeemable 5% cumulative preferred stock		137,254
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	348,045	356,604
Restricted cash	25,459	50,266
Notes receivable, net	520,331	587,000
Receivable-backed notes payable	408,200	440,900
Notes payable and other borrowings	208,483	194,069
Junior subordinated debentures	84,500
Redeemable 5% cumulative preferred stock		146,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	348,045	356,604
Restricted cash	25,459	50,266
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, net	520,331	587,000
Receivable-backed notes payable	408,200	440,900
Notes payable and other borrowings	208,483	194,069
Junior subordinated debentures	$ 84,500
Redeemable 5% cumulative preferred stock		$ 146,000