Basis and Summary of Significant Accounting Policies - Components of the Accounts Receivable Provision (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Bad Debt Expense	$ 1,166	$ 96,651
Provision for Returns and Uncollected Renewal Payments	136,445	16,426
Accounts Receivable Provision	$ 137,611	$ 113,077