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Financial Instruments and Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets    
Derivative financial instruments $ 7,018 $ 4,402
Liabilities    
Derivative financial instruments 7,304 1,467
Recurring | Level 1    
Assets    
Money Market Funds 4,504 3
Derivative financial instruments 0 0
Liabilities    
Derivative financial instruments 0 0
Recurring | Level 2    
Assets    
Money Market Funds 0 0
Derivative financial instruments 7,018 4,402
Liabilities    
Derivative financial instruments 7,304 1,467
Recurring | Level 3    
Assets    
Money Market Funds 0 0
Derivative financial instruments 0 0
Liabilities    
Derivative financial instruments $ 0 $ 0