Provision for Doubtful Accounts, Bad Debt Expense

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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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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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Business and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash provided by operating activities	$ (356,498)	$ (159,135)	$ (467,236)
Cash provided by (used in) financing activities	(128,968)	(211,397)	(153,663)
Retained Earnings	2,005,344	1,819,524
Customer Deposits and Advance Payments	80,579	68,060
Bad Debt Expense	227,960	170,574	128,333
Pro Forma \| Accounting Standards Update 2014-09, Revenue From Contracts With Customers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Customer Deposits and Advance Payments				$ 2,400
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09, Revenue From Contracts With Customers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings	(704)			$ (2,400)
Customer Deposits and Advance Payments	994
Progressive Leasing
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Bad Debt Expense	$ 227,800	$ 170,500	$ 127,900