Business and Summary of Significant Accounting Policies (Changes in Allowances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance as of January 1	$ 23,096	$ 17,306	$ 19,895
Current year increases	49,966	19,878	8,243
Write-offs, net of recoveries and other	(27,174)	(14,088)	(10,832)
Balance as of December 31	$ 45,888	$ 23,096	$ 17,306