Loans and Finance Receivables and Allowance for Credit Losses (Allowance Roll Forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 140,040	$ 109,015	$ 110,162
Recoveries of previously charged off amounts	18,920	13,179	17,199
Loans and finance receivables charged off	(181,196)	(130,695)	(171,272)
Provision for credit losses	173,369	148,541	152,926
Allowance for credit losses, ending balance	$ 151,133	$ 140,040	$ 109,015