Business and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 34,861	$ 27,401	$ 7,172
Accounts Written Off	(167,094)	(155,651)	(79,054)
Accounts Receivable Provision	167,923	163,111	99,283
Ending Balance	$ 35,690	$ 34,861	$ 27,401