Business and Summary of Significant Accounting Policies - Accounts Receivable Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Bad Debt Expense	$ 128,333	$ 122,184	$ 60,514
Provision for Returns and Uncollected Renewal Payments	39,590	40,927	38,769
Provision for Doubtful Accounts	$ 167,923	$ 163,111	$ 99,283