Financial Instruments and Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Derivative financial instruments	$ 1,057	$ 7,018
Liabilities
Derivative financial instruments	37,354	7,304
Recurring | Level 1
Assets
Money Market Funds	0	4,504
Derivative financial instruments	0	0
Liabilities
Derivative financial instruments	0	0
Recurring | Level 2
Assets
Money Market Funds	0	0
Derivative financial instruments	1,057	7,018
Liabilities
Derivative financial instruments	37,354	7,304
Recurring | Level 3
Assets
Money Market Funds	0	0
Derivative financial instruments	0	0
Liabilities
Derivative financial instruments	$ 0	$ 0