Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Payable and Accrued Expenses
Accounts payable	$ 290,104	$ 7,384
Accrued expenses	128,990	5,922
Accrued royalty	56,595
Accrued payroll and other benefits	20,814	2,236
Accrued interest	22,128	1,768
Other	7,232	4,894
Total	$ 525,863	$ 22,204