Finance Receivables, net (Schedule of Cash Collections Applied to Principal) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Receivables [Abstract]
2020	$ 864,692
2021	692,946
2022	507,491
2023	378,679
2024	259,808
2025	171,873
2026	110,078
2027	84,212
2028	61,656
2029	47,347
Thereafter	60,031
Total ERC expected to be applied to principal	$ 3,238,813