Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets (Liabilities)
Total	$ 8,912	$ (24,954)
Fair value on a recurring basis
Assets (Liabilities)
Derivative Asset	10,059	(24,954)
Derivative Liability	(1,192)
Total	8,867	(24,954)
Fair value on a recurring basis | Level 1
Assets (Liabilities)
Derivative Asset	0	0
Derivative Liability	0
Fair value on a recurring basis | Level 2
Assets (Liabilities)
Derivative Asset	10,059	(24,954)
Derivative Liability	(1,192)
Total	8,867	(24,954)
Fair value on a recurring basis | Level 3
Assets (Liabilities)
Derivative Asset	0	$ 0
Derivative Liability	$ 0