Summary of Significant Accounting Policies (Other Current Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Accounts payable	$ 10,325		$ 18,552
Accrued promotional expenses	22,207		30,691
Accrued excise and payroll taxes payable, net	18,872		11,946
Accrued interest	20,123		33,138
Commissions payable	14,528		14,320
Accrued salary and benefits	13,918		29,639
Other current liabilities	31,434		18,837
Total other current liabilities	$ 131,407	$ 167,454	$ 157,123