Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Non-current liabilities
Derivative liability	$ (7,781)
Assets
Derivative assets		$ 4,344
Quoted Prices in Active Markets for Identical Assets (Level 1)
Non-current liabilities
Derivative liability	0
Assets
Derivative assets		0
Significant Other Observable Inputs (Level 2)
Non-current liabilities
Derivative liability	(7,781)
Assets
Derivative assets		4,344
Significant Unobservable Inputs (Level 3)
Non-current liabilities
Derivative liability	$ 0
Assets
Derivative assets		$ 0