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Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets    
Derivative asset $ 15,410 $ 48,186
Liabilities    
Derivative liability 7,716 13,848
Level 3    
Liabilities    
Derivative liability 7,694  
Fair Value, Measurements, Recurring    
Assets    
Derivative asset 15,410 48,186
Liabilities    
Derivative liability 7,716 13,848
Fair Value, Measurements, Recurring | Level 1    
Assets    
Derivative asset 0 0
Liabilities    
Derivative liability 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets    
Derivative asset 0 0
Liabilities    
Derivative liability 0 0
Fair Value, Measurements, Recurring | Level 3    
Assets    
Derivative asset 15,410 48,186
Liabilities    
Derivative liability $ 7,716 $ 13,848