Summary of Significant Accounting Policies, Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Expenses [Abstract]
Accrued sales force commissions and other payments	$ 103,532	$ 128,022
Accrued income taxes	0	6,674
Accrued other taxes	29,657	38,693
Accrued payroll and other employee expenses	30,610	68,155
Accrued payable to vendors	34,760	34,539
Short-term lease liability	39,349	0
Accrued royalties	514	3,899
Sales return reserve	3,903	3,577
Deferred revenue	20,162	20,104
Other	27,794	18,920
Total accrued expenses	$ 290,281	$ 322,583