Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable—seller	$ 228,850	$ 138,366
Accounts payable—trade	6,962	5,350
Accrued employee-related payables	12,155	7,305
Accounts payable and accrued expenses	247,967	151,021
Accounts Payable, Right to Offset, Current	$ 700	$ 700