Summary of Significant Accounting Policies (Other Current Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accounts payable	$ 12,232	$ 10,222
Accrued promotional expenses	44,254	35,900
Accrued excise and payroll taxes payable, net	149,758	18,653
Accrued interest	31,623	35,756
Commissions payable	22,225	18,378
Accrued salary and benefits	15,407	29,464
Contract liabilities	7,830	9,358
Allowance for sales returns	8,191	7,785
Other current liabilities	40,514	23,801
Total other current liabilities	$ 332,034	$ 189,317