Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Non-current assets (liabilities)
Derivative liabilities	$ (7,649)
Derivative assets		$ 4,344
Quoted Prices in Active Markets for Identical Assets (Level 1)
Non-current assets (liabilities)
Derivative liabilities	0
Derivative assets		0
Significant Other Observable Inputs (Level 2)
Non-current assets (liabilities)
Derivative liabilities	(7,649)
Derivative assets		4,344
Significant Unobservable Inputs (Level 3)
Non-current assets (liabilities)
Derivative liabilities	$ 0
Derivative assets		$ 0